Installation (cont’d)
DANGER 
HAZARDOUS VOLTAGE
(Can Cause Severe Injury or Death)
Turn OFF all power before installation, adjustment, or removal of transfer switch or any of its components.
Functional Test
The functional testing of the transfer switch consists of electrical tests described in this section. Before proceed- ing, read and understand all instructions and review the operation of all accessories provided.
To begin the test, close the Utility source circuit breaker.
The controller will illuminate the optional Utility Available
LED when proper voltage is sensed. Verify the phase to phase voltages at the Utility line terminals.
Functional Test
Initiate the electrical transfer test by opening the Utility side breaker. The delay to engine start timer (P) begins its timing cycle. After the P timer has completed its timing cycle, the engine start contacts close to start the generator.
When Generator voltage and frequency reach preset pickup points the optional Generator Available LED illuminates. Simultaneously, the delay to Generator timer (W) begins its timing cycle. When the W time delay is completed the switch will transfer to Generator. The optional Utility
Next, close the Generator source breaker and start the engine generator. The optional Generator Available
LED will illuminate when proper voltage and frequency levels is sensed. If Generator LED is flashing, use the Reset button to clear. Check the phase to phase voltages at the Generator line terminals. On three phase units, verify that the phase rotation of the Generator source is same as Utility source.
After the sources have been verified, shut down the engine generator, and put the starting control in the automatic posi- tion. Complete the visual inspection of the transfer switch, and replace the cabinet cover (or close the cabinet door).
Factory Settings
Utility Pickup Voltage | 90% Nominal | |
Line Voltage | ||
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Utility Dropout Voltage | 80% Nominal | |
Line Voltage | ||
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Utility Pickup Frequency | 90% Nominal | |
Line Frequency | ||
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(T) Timer/Delay to Utility | 5 minutes* | |
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(U) Timer/Engine | 5 minutes* | |
Cool Down | ||
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Table 3 |
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Position LED goes off, and the optional Generator Position LED illuminates.
Reclose the Utility breaker to retransfer to Utility. The delay to Utility timer (T) begins its timing cycle. When the T timer has completed its timing cycle, the switch will transfer into Utility. The optional Generator Position
LEDs go off, and the Utility Position LED illuminates.
The delay engine stop timer (U) begins its timing cycle. The generator runs unloaded for the duration of the U timing cycle. When the timer completes its timing cycle, the generator will stop. The optional Generator Available
LED goes off.
Factory Settings
Generator Pickup Voltage | 90% Nominal | |
Line Voltage | ||
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Generator Dropout Voltage | 80% Nominal | |
Line Voltage | ||
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Generator Pickup Frequency | 95% Nominal | |
Line Frequency | ||
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(P) Timer/Engine Start | 5 seconds* | |
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(W) Timer/Delay to Generator | 20 seconds* | |
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*Factory default settings — customer time settings may vary due to specifications from the generator supplier.
■ 6 | ZTX Operation and Maintenance Manual | GE Zenith Controls ■ |
