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2.4.10 Inverter Test Switch
The Inverter Test Switch is a momentary push button for testing the Protector #3 and its batteries for
proper operation. With Protector 3 in operation, test switch is pushed and held, the unit will automatically
transfer to battery operation. The UPS will continue to run on batteries until the switch is released. Upon
release, the Protector 3 transfers back from battery to inverter and resumes normal operation.
2.4.11 DC Supply Transformer
The step down transformer, protected with fuse supplies DC rectifier which produces voltages for power
system boards. The primary of this transformer has various taps that need to be matched to the actual
main input voltages.
2.4.12 Maintenance bypass switch
This MBS can be used for maintenance when the inverter fails or PM is required. This MBS will transfer
the input power directly to critical load. Before switching the MBS to maintenance position, first turn on S1
(toggle switch), then switch to maintenance (MAN) position. Refer to the operation label on the unit. After
repair or PM, the MBS can be switched to UPS position. First turn-off S1 (toggle switch), then switch MBS
to UPS (AUTO) position.
INPUT
TB10
CIRCUIT
BREAKER
1
2
3
N
4
INPUT
POWER
3 PHASE
Optional
1
Line removed when External Reserve Input Power is in use.
Use for different Input and Output Voltage unit.
2
NOTE: Optional External Wrap-around Bypass Switch is available.
ILLUSTRATION 2-4: FUNCTIONAL BLOCK DIAGRAM FOR SINGLE INPUT POWER
TVSS
INPUT
CONTACTOR
INPUT
XFMR
1
2
BATTERY
CIRCUIT
BREAKER
Batt.
Batt.
Batt.
Cab 1
Cab 2
Cab 3
2-7
OUTPUT
CIRCUIT
BREAKER
STATIC
SWITCH
OUTPUT
XFMR
INVERTER
STATIC
SWITCH
AUX OUTPUT CBs
BATTERY
CABINET
Batt.
Batt.
Cab 4
Cab 5
TB11
1
2
INPUT
MAINT.
3
BYPASS
SWITCH
4
N
OUTPUT
POWER
3 PHASE
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