Transcript
Alpha Genasys BROADBAND AND CENTRALIZED POWER SYSTEM
Transfer Switch Unit (TSU)
OPERATOR’S MANUAL
©1997 Alpha Technologies
Powering Systems
Table of Contents
The Alpha Transfer Switch Unit (TSU)
1.
INTRODUCTION 1.1 Transfer Switch Unit 1.2 Unpacking and Inspection
1 1 2
2.
INSTALLATION
3
3.
FEATURES 3.1 TSU Front Panel 3.1.1 Power Line Inputs 3.1.2 Circuit Breakers 3.1.3 Power Flow LED Block 3.1.4 SYS (System) LED Block 3.1.5 Push-button Switches 3.1.6 Connectors
4 4 5 6 7 8 9 10
4.
OPERATION 4.1.1 Automatic Operation 4.1.2 Resetting the TSU 4.2 Start-up and Test 4.2.1 Manual Transfer Test 4.2.2 Alarm Test
11 11 11 12 13 14
5.
MAINTENANCE 5.1 Maintenance
15 15
6.
TROUBLESHOOTING AND REPAIR 6.1 Fuse Replacement
16 17
7.
SPECIFICATIONS
17
8.
GLOSSARY
18
TSU.PM6-970421R
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Powering Systems
IMPORTANT SAFETY INSTRUCTIONS CONTAINED IN THIS MANUAL
CAUTION RISK OF ELECTRICAL SHOCK
THE FOLLOWING SYMBOLS HAVE BEEN PLACED THROUGHOUT THE MANUAL TO INDICATE AREAS OF POTENTIAL DANGER AND THE LOCATION OF IMPORTANT OPERATING INSTRUCTIONS. WHERE THESE SYMBOLS APPEAR, INSTALLATION OR SERVICING SHOULD BE PERFORMED ONLY BY QUALIFIED PERSONNEL.
DANGEROUS VOLTAGE THIS SYMBOL INDICATES A "DANGEROUS VOLTAGE" EXISTS IN THIS AREA OF THE PRODUCT. USE CAUTION WHENEVER WORKING IN THIS AREA TO PREVENT ELECTRICAL SHOCK.
ATTENTION THIS SYMBOL INDICATES IMPORTANT INSTALLATION, OPERATION OR MAINTENANCE INSTRUCTIONS. ALWAYS FOLLOW THESE INSTRUCTIONS CLOSELY.
Save These Instructions
NOTE: Alpha Technologies products are subject to change through continual improvement processes, therefore, specifications and/or design layouts may vary slightly from descriptions included in this manual. Updates to the manual will be issued when changes affect form, fit or function.
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Powering Systems
IMPORTANT SAFETY PRECAUTIONS THE POWER SUPPLY SHOULD BE SERVICED ONLY BY QUALIFIED PERSONNEL. IF THE BATTERIES ARE BEING STORED, PRIOR TO INSTALLATION, THEY SHOULD BE CHARGED AT LEAST ONCE EVERY THREE MONTHS TO ENSURE OPTIMUM PERFORMANCE AND MAXIMUM BATTERY SERVICE LIFE. VERIFY THE VOLTAGE REQUIREMENTS OF THE EQUIPMENT TO BE POWERED (LOAD), THE AC INPUT VOLTAGE TO THE LCM (LINE), AND THE OUTPUT VOLTAGE OF THE LCM PRIOR TO INSTALLATION. THE UTILITY SERVICE PANEL SHOULD BE EQUIPPED WITH A CIRCUIT BREAKER THAT IS PROPERLY RATED FOR USE WITH THE POWER SUPPLY. WHEN CONNECTING A LOAD TO THE POWER SUPPLY, DO NOT EXCEED ITS OUTPUT RATING. USE PROPER LIFTING TECHNIQUES WHENEVER HANDLING THE LCM OR BATTERY PACK. THE POWER SUPPLY (LCM + IPM) CONTAINS MORE THAN ONE LIVE CIRCUIT. EVEN THOUGH AC IS NOT PRESENT AT THE INPUT, IT MAY BE PRESENT AT THE OUTPUT. ALWAYS SWITCH ALL IPM BATTERY CIRCUIT BREAKERS TO OFF BEFORE CONNECTING OR DISCONNECTING AN EXTERNAL BATTERY PACK. THIS GREATLY REDUCES THE CHANCE OF SPARK. BATTERY PACKS, USED TO PROVIDE INVERTER BACKUP POWER, CONTAIN DANGEROUS VOLTAGES. BATTERY INSPECTION AND REPLACEMENT SHOULD BE PERFORMED ONLY BY QUALIFIED PERSONNEL. WEAR INSULATED GLOVES AND EYE PROTECTION WHENEVER WORKING WITH BATTERIES. DO NOT ALLOW LIVE BATTERY WIRES TO CONTACT THE CHASSIS. SHORTING BATTERY WIRES COULD RESULT IN A FIRE OR POSSIBLE EXPLOSION. BATTERIES SHOULD BE INSPECTED EVERY 12 MONTHS FOR SIGNS OF CRACKS, LEAKING OR SWELLING. ALWAYS REPLACE BATTERIES WITH THOSE OF AN IDENTICAL TYPE AND RATING. NEVER INSTALL OLD OR UNTESTED BATTERIES. AVOID USING UNINSULATED TOOLS OR OTHER CONDUCTIVE MATERIALS WHEN HANDLING BATTERIES OR WORKING INSIDE THE ENCLOSURE. REMOVE ALL RINGS, WATCHES AND OTHER JEWELRY BEFORE SERVICING BATTERIES. SPENT BATTERIES ARE CONSIDERED ENVIRONMENTALLY UNSAFE. ALWAYS RECYCLE BATTERIES.
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Powering Systems
Transfer Switch Unit
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1. INTRODUCTION
1.1 Transfer Switch Unit The Transfer Switch Unit (TSU) provides an alternate source of power to the system’s Line Conditioner Modules in the event the main power source fails (i.e., utility failure). The TSU monitors the inputs and, when a utility failure occurs, automatically transfers its output to the secondary power source, which is normally an Auxiliary Power Unit (APU). On systems equipped with Inverter Power Modules (IPM), the output power will not be interrupted as the inverters will immediately provide backup power to the system. Systems not equipped with IPMs will lose output power for approximately 5 seconds (while the transfer takes place). The TSU contains Break-Before-Make (BBM) contactors which break the input circuit from one source before making contact with the other source. This is a safety feature preventing output current from accidently being back-fed to the utility lines. Before power is transferred to the output of the TSU, it must be qualified. This means that the AC power must be stable, plus have the correct voltage and frequency before transfer can take place. LEDs on the front panel of the unit indicate the source of power being supplied to the TSU’s output receptacle. Contactor K1 is the main power source (utility) and contactor K2 is the Auxiliary Power source (generator). The green OUT LED illuminates when a qualified power source has transferred to the output. Upon initially powering up the Transfer Switch Unit, there is a brief TSU LED check routine that is run by the TSU’s microprocessor (where all of the LEDs illuminate). Once this test is completed, the TSU LEDs will indicate its actual operating status.
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Simplified TSU Block Diagram
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1. UNPACKING AND INSPECTION
1.2 Unpacking and Inspection NOTE: Unpacking and Inspection apply to items shipped separately and not already installed in the main enclosure. Carefully remove the module or unit from its shipping container. Inspect the contents. If items appear to be damaged or missing, contact Alpha Technologies and the shipping company immediately. Most shipping companies have only a short claim period. Make sure the following items have been included: 1. System Module or Unit 2. Operator's Manual 3. Any other ordered options SAVE THE ORIGINAL SHIPPING CONTAINER. In the event a module or unit needs to be returned for service, it should be packaged in its original shipping container. If applicable, it should also be secured to a pallet. If the original container is not available, make sure that the unit is packed with at least three inches of shock-absorbing material and properly supported to prevent shipping damage. NOTE: Do not use popcorn-type material. Alpha Technologies is not responsible for damage caused by the improper packaging of returned units. PLEASE READ THE OPERATOR'S MANUAL. Become familiar with the unit’s front panel. Review the drawings and illustrations before proceeding. If you have questions regarding the safe installation or operation of the system, contact Alpha Technologies. WARRANTY. Alpha Technologies, Inc., provides a LIMITED WARRANTY covering the performance of its Broadband products. The terms and conditions of the LIMITED WARRANTY STATEMENT are contained in a separate written LIMITED WARRANTY STATEMENT included with the Operator’s manual provided with this product. If there are any warranty claims, the purchaser (or purchaser’s representative) must follow the LIMITED WARRANTY guidelines, described in the applicable LIMITED WARRANTY STATEMENT.
COMPLETE THE FOLLOWING FOR YOUR RECORDS: Model # Serial # Options Purchase date THIS UNIT WAS PURCHASED FROM: Dealer name City State/Province Zip/Postal Code Country Telephone #
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2. INSTALLATION
2.1 Installation Installation: Installation consists of sliding the Transfer Switch Unit into the Modular Equipment Rack of the system. You may have to lift the rear of the unit slightly and set it onto the rear seismic brackets. Install the four rack screws into the ear tabs of the TSU and tighten. Install the appropriate system cables.
Seismic Mounting Bracket
Rack-Mounting ‘Ear’
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3. FEATURES
3.1 TSU Front Panel All inputs, circuit breakers, connectors and the output receptacle are conveniently located on the front panel of the unit. There is no need to remove the TSU to make connections to system components.
POWER FLOW LED BLOCK LINE INPUT (Primary)
SYSTEM LED BLOCK
MANUAL TRANSFER SWITCHES
TSU CONNECTOR
COMM CONNECTORS GENERATOR INPUT (Secondary)
APU CONNECTOR
GENERATOR CIRCUIT BREAKER OUTPUT RECEPTACLE LINE CIRCUIT BREAKER
TSU Front Panel
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TEST POINTS
3. FEATURES
3.1 TSU Front Panel, continued 3.1.1 Power Input Lines: There are two input lines to the TSU which are hardwired to its front panel and terminate in 50 Amp, 240 Volt plugs. LINE: The LINE input connects to the LINE receptacle of the Input Power Panel (IPP). This provides utility power to the TSU. When qualified utility power is present at the TSU’s input, the LINE LED will be illuminated. When the output is supplied by LINE, the LINE LED is illuminated. GEN: The GEN input connects to the GEN receptacle of the Input Power Panel (IPP). This input provides auxiliary generator power to the TSU in the event of a utility outage. Qualified auxiliary power is indicated on the TSU by illuminating the GEN LED. When the output is supplied by by the generator, the K2 LED is illuminated. Normally, this input is not powered when utility power is present.
LINE INPUT
LINE LED
GEN INPUT
GEN LED
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3. FEATURES
3.1 TSU Front Panel, continued 3.1.2
Circuit Breakers: There are two circuit breakers located on the front panel of the TSU. These serve to protect the system from overloads and can be used as an ON/OFF switch to disconnect the power from the output of the TSU. LINE: The LINE circuit breaker disconnects utility power from the TSU. When this circuit breaker is switched OFF, an alarm condition is detected and the red ALARM LED will illuminate. GEN: The GEN circuit breaker disconnects the APU (generator) from the TSU. When the circuit breaker is switched OFF, an alarm condition is detected and the red ALARM LED will illuminate.
LINE Circuit Breaker
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GEN Circuit Breaker
3. FEATURES
3.1 TSU Front Panel, continued 3.1.3 Power Flow LED Block: The Power Flow LEDs indicate the power source supplied to the Transfer Switch Unit. Normally, the green LINE LED is illuminated, along with the green K1 contactor LED and the green OUT LED. This indicates the LINE power is qualified, the K1 contactor is closed and output power is available. The GEN and K2 LEDs are normally OFF as no power is being supplied to the TSU input from the generator (APU). During a utility outage, the green GEN, K2, and OUT LEDs should be illuminated (after the APU engine starts and the generator power is qualified).
The Power Flow LED Block indicates the input power source and TSU output.
Power Flow LED Block
= LED OFF
= LED ON 7 021-017-B0-001 4/97 ©1997 Alpha Technologies
3. FEATURES
3.1 TSU Front Panel, continued 3.1.4 SYS (System) LED Block: The SYS (System) LED block contains three LEDs to indicate the status of the TSU.
The SYS (System) LED Block indicates any detected Alarms, Communication status, and the current Auto mode setting.
ALARM: The red Alarm LED illuminates if there is an open circuit breaker and flashes if there is a contactor failure. There are two types of alarms: latched and unlatched. Latched alarms require a manual reset to clear them. Unlatched alarms clear when the alarm condition is no longer present. COMM LED: The green COMM LED indicates the TSU is communicating properly with the other components in the system by briefly lighting after any system communication. If status monitoring is not installed, the COMM LED will not illuminate. AUTO LED: The green AUTO LED indicates the TSU is set in the AUTO transfer mode. When this LED is illuminated, the TSU will automatically transfer its contactors to a qualified power source. Whenever a utility power failure is sensed, the TSU automatically transfers to the generator for input power. When utility power is restored, the TSU transfers back to the primary power source (utility) to supply the load. If the AUTO LED is not illuminated, it means that the TSU is not set to respond automatically to a utility outage. To initiate the AUTO mode of operation, press the RESET push-button (described on the next page).
= LED OFF
= LED ON 8
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3. FEATURES
3.1 TSU Front Panel, continued 3.1.5 SELECT RESET Push-button Switches: Two push-button switches are located on the front panel of the TSU: SELECT and RESET. These switches are used to manually transfer the input source, reset the TSU to the primary power source (utility) and reset the unit to the AUTO mode. NOTE: Operating these push-button switches on systems without a UPS will cause the output power to be dropped.
The Manual Transfer Switch Block allows manual selection of the input source; reset to utility; and reset to the auto mode.
SELECT: The SELECT push-button switch forces a transfer of input from one power source to the other. In order for the transfer command to take effect, the switch must be depressed for 3 seconds (transfer will occur in an additional 5 seconds). Three to five seconds is required after release of the switch before depressing again. Assuming that the TSU is sourcing power from the LINE (utility), the LINE LED will extinguish, indicating that the TSU is no longer supplying output power to the system. If a UPS is installed, the system runs on battery backup power for a predetermined amount of time (approximately ten minutes), before starting the generator. On systems without a UPS, the generator immediately starts. When the generator power has stabilized, it is qualified, transferred through the TSU and provides output power to the system. This is indicated with the power flow LEDs: GEN; K2; and OUT illuminating. NOTE: When the unit has been transferred using the SELECT push-button switch, it is no longer in the AUTO mode. Do not leave the system in this mode as the TSU will not be able to transfer its input power to the generator should a utility power outage occur. In this case, the system would drop its output power to the load until the utility was restored. If the system is configured with a UPS, power would be dropped when the Inverter batteries are depleted. RESET: The RESET push-button switch will reset the contactors from K2 and GEN to K1 and LINE. It also resets the unit to AUTO mode.
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3. FEATURES
3.1 TSU Front Panel, continued 3.1.6 Connectors: There are four connectors, two sets of test points, and one output receptacle on the front panel of the Transfer Switch Unit. APU: The APU (Auxiliary Power Unit) connector sends a command to indicate that the generator is on-line. TSU: The TSU connector is provided for testing the TSU using a special Alpha Test Box. COMM: The COMM connectors are used to communicate system status to and from the other components in the Genasys system in a daisy-chain configuration. TEST POINTS: Two sets of TEST POINTS are located on the TSU’s front panel allowing a technician to measure the actual voltage supplied to the unit. These TEST POINTS allow the measurement of AC voltages from the applied power source. L1 to L2 should measure 240 VAC (for 240 VAC installations). LINE: The LINE TEST POINTS are used for measuring the 240 VAC utility voltage whenever it is present and the LINE circuit breaker is switched ON. GEN: The GEN TEST POINTS are used for measuring the 240 VAC generator voltage output whenever the generator is running and the GEN circuit breaker is switched ON. OUTPUT RECEPTACLE: The OUTPUT RECEPTACLE is a 50 AMP, 240 VAC receptacle which supplies the output power from the TSU to the system’s Line Conditioner Module. The Power Flow LEDs indicate the source of the power being supplied to the receptacle.
LINE and GEN Test Points
COMM Connectors
TSU Connector
APU Connector 10
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OUTPUT Receptacle
4. OPERATION
4.1 Operation 4.1.1 Automatic Operation: The Transfer Switch Unit operates in a fully automatic mode and, therefore, requires no user intervention under normal use. User items include the LINE and GEN circuit breaker and the SELECT and RESET push-button switches. Make sure that both circuit breakers are switched ON or an alarm condition will occur. The TSU can not perform a transfer when an input circuit breaker is switched OFF as the load would be dropped. 4.1.2 Resetting the TSU: If the red ALARM LED is illuminated, check that both circuit breakers on the TSU are switched ON. Press the RESET push-button to clear any alarms and also reset the TSU to LINE input and AUTO mode.
SELECT Switch
RESET Switch
LINE Circuit Breaker
GEN Circuit Breaker
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4. OPERATION
4.2 Start-up and Test The Start-up and Test routine is intended to be used when a unit is first installed or for testing a unit that has just been serviced. Installed systems that are operating properly do not have to be tested using this procedure. NOTE: Performing these tests on non-UPS systems will result in the output power being dropped during transfers. Before starting these tests, make sure that the unit is properly installed in the system and all system cables are attached. Procedure: 1. Make sure utility power is applied to the system and all system components are installed (including Inverter batteries on UPS systems). 2. With the system running from utility power, the TSU LEDs should indicate: Power Flow LEDs: LINE ON K1 ON GEN OFF K2 OFF OUT ON SYS (System) ALARM *COMM AUTO
LEDs: OFF FLASHING or ON ON
*The COMM LED will be OFF on units without status monitoring.
3. Remove utility power by switching the Service Entrance circuit breaker OFF. Verify: All LEDs turn OFF. If the system contains a UPS, the batteries will provide backup power for approximately 10 minutes. NOTE: If there is no UPS installed in the system, the generator will start immediately and the output power will be dropped for approximately 20 seconds. This is the time required to start the generator and qualify the input voltage. 4. After the 10 minute period, the generator will start. The TSU will go through its LED self-test, then qualify the AC power and transfer its input contactors to generator power. The LEDs should now indicate as follows: Power Flow LEDs: LINE OFF K1 OFF GEN ON K2 ON OUT ON SYS (System) ALARM *COMM AUTO
= LED OFF
LEDs: OFF FLASHING or ON ON
*The COMM LED will be OFF on units without status monitoring.
= LED ON 12
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4. OPERATION
4.2 Start-up and Test, continued 5. Switch the utility circuit breaker (in the service entrance) to ON. The LEDs should indicate as follows: (after a brief qualification period) Power Flow LEDs: LINE ON K1 ON GEN ON K2 OFF OUT ON SYS (System) ALARM *COMM AUTO
LEDs: OFF FLASHING or ON ON
*The COMM LED will be OFF on units without status monitoring.
6. After an engine cool down period of 10-12 minutes, the generator will stop and the GEN LED will turn OFF. 4.2.1 Manual Transfer Test: This test will verify the operation of the manual SELECT and RESET push-button switches. 1. Start the generator by placing the CTRL SELECT switch on the Auxiliary Control Unit (ACU) to the MAN position. Press and hold the APU CONTROL START switch until the generator starts. 2. The power flow GEN LED should turn ON indicating that generator power is available. 3. Press and hold the SELECT push-button switch for 5 seconds. Verify: The K1 contactor LED turns OFF. The K2 contactor LED turns ON (after approximately 5 seconds). The OUT LED turns OFF then, after approximately 5 seconds, back ON indicating that power has successfully transferred to K2. The AUTO LED turns OFF (indicating manual transfer mode is selected).
*The COMM LED will be OFF on units without status monitoring.
4. Press the RESET push-button switch on the TSU. Verify: The K1 contactor LED turns ON (after approximately 5 seconds). The K2 contactor LED turns OFF (after approximately 5 seconds). The OUT LED turns OFF then ON (after approximately 5 seconds). The SYS block AUTO LED turns ON. 5. Stop the generator by pressing the ACU’s APU CONTROL STOP switch until the engine completely stops. 6. Return the ACU to the AUTO mode by setting the ACU’s CTRL SELECT to the MAN position. 13 021-017-B0-001 4/97 ©1997 Alpha Technologies
4. OPERATION
4.2 Start-up and Test, continued 4.2.2 Alarm Test: Switch the LINE circuit breaker to OFF. Verify that the red ALARM turns ON. Place the LINE circuit breaker to ON. Verify that the ALARM LED turns OFF. Repeat this test using the GEN circuit breaker. If the ALARM LED flashes, it indicates a contactor failure which can only be cleared by pushing the RESET button.
ALARM Detected
= LED OFF
ALARM Cleared
= LED ON 14
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5. MAINTENANCE
5.1 Maintenance The Transfer Switch Unit is fully automatic and requires no scheduled maintenance.
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6. TROUBLESHOOTING AND REPAIR
6.1 Fuse Replacement There are six fuses located internally on the TSU printed circuit boards. These fuses can be replaced at the site by a technician; however, if any of these fuses are open, there is, most likely, a more serious problem on one of the PCBs. Alpha recommends the entire TSU be replaced, or the internal circuit boards be swapped with known good PCBs if the TSU is not operating properly. To access the PCB containing the fuses, remove the two screws on the front panel and drop the panel down. WARNING: REMOVE ALL POWER FROM THE TSU BEFORE ATTEMPTING TO ACCESS THE FUSES. NOTE: Only replace fuses with the same type and rating. NOTE: UPS systems should be set to Inverter (battery backup) mode so the load is not dropped. Output power will be interrupted while servicing the TSU on non-UPS systems.
F1, F3, F5, and F6 are 0.5 A; 5 mm x 20 mm; 250 V; Slow Blo fuses. F2 and F4 are 3.15 A; 250 V; Plug-in (IEC 127-3); Slow Blo fuses.
F3 - 0.5 A F4 - 3.15 A 0.5 A
F6 - 0.5 A F1 - 0.5 A F2 - 3.15 A F5 - 0.5 A
Remove Screws and Drop Panel to Access Fuses
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7. SPECIFICATIONS
Specifications
AC Input Voltage AC Input Frequency AC Input Current Low Voltage Trigger: Line Gen High Voltage Trigger: Line Gen
240 VAC 60 Hz (+ 3 Hz) 50 Amps
185 VAC 167 VAC 267 VAC 288 VAC
AC Output Voltage AC Output Frequency AC Output Watts
240 VAC 60 Hz 12 KVA max
LINE Circuit Breaker GEN Circuit Breaker
50 Amps 50 Amps
Operating Temperature
-40oC – +65
Mechanical Dimensions HxWxD Weight (approximate)
5.2" x 21.5" x 17" (130 mm x 538 mm x 425 mm) 44.5 lbs (20 kg)
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8. GLOSSARY
8. Glossary TERM
DESCRIPTION
ACU
Auxiliary Control Unit. Controls the operation of the APU (generator or alternator).
APU
Auxiliary Power Unit. Auxiliary power system controlled by the ACU. An APU can be either an AC unit (generator) or rectified DC unit (alternator) depending on the configuration of the system.
BP
BPS Thermally Managed Battery Pack (Battery Enclosure).
BPS
Broadband Power System. Refers to the entire “system” containing the individual Units or Modules including an integrated generator.
CFR
Controlled Ferroresonance technology used in the LCM.
CPS
Centralized Power System. Refers to the entire “system” containing the individual Units or Modules. An optional generator can be installed separately from the CPS enclosure.
DVM
Digital Voltmeter (True RMS ONLY for AC Voltage measurements).
GTS
Grid Transfer Switch. Automatically selects one of two AC utility inputs. The second utility grid is used as a backup source of power.
IPM
Inverter Power Module. Provides battery backup power when combined with an LCM forming a UPS.
LED
Light Emitting Diode. Used in the display blocks of the sub-systems to indicate their status or alarms. Also used in alphanumeric displays.
LCM
Line Conditioner Module. Conditions the incoming AC. When combined with an Inverter Power Module (IPM), the combination forms an Uninterruptible Power Supply (UPS).
ME
Main Enclosure. Refers to the enclosure and internal sub-systems.
MTS
Manual Transfer Switch. Provides AC input transfer from line to an AC mobile generator connection.
NIU
Network Interface Unit. Used as the link between Alpha’s proprietary internal, slow speed, serial communications and the high speed serial network protocol.
Operator/ User
A person operating and/or monitoring the system. Unless otherwise specified, references to the operator (or user) will apply to a person operating the unit locally (at the site). User operation of the system from anywhere but at the site will be referred to as a Remote User or as Status Monitoring.
PIM
Protective Interface Unit. Provides AC output overload protection, redundancy transfer function and related powering performance status monitoring.
PBM
Power Bus Module. Provides an LCM output bus connection for N+1 redundancy installations.
SCM
Status Control Module. Coordinates the communication of the individual sub-systems in the unit and provides two-way communication with the headend.
SCM-DM
Display Module for the SCM. Also allows user view system data and change programmable functions.
SPI
Service Power Interface. Connects the power supply output voltages to the customer’s power inserters and provides a way to insert power into the system when it is being serviced.
TSU
Transfer Switch Unit. Used in systems incorporating an AC generator to automatically switch between utility and generator power if the utility fails.
UPS
Uninterruptible Power Supply. If the AC utility fails, the UPS will keep the system powered, without interrupting the load, using batteries to power the inverter circuit in the Inverter Power Module.
UBV
Underground Battery Vault. Used to store batteries.
BD-8
Battery Drawer. Installs under CE-5 or CE-6 enclosures.
NOTE: Not all of the above terms may be used in this document.
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http://www.alpha-us.com
Alpha sales and service offices located throughout the world
Printed in the USA
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