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GE Zenith Controls 15
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ZTX Operation and Maintenance Manual (72R-1000)
Troubleshooting
Symptom Possible Cause Corrective Action
S1 or S2 Available LED not lit Sources either fully or partially unacceptable Check for under voltage
S1 or S2 breakers open Check for missing phase (s)
Check for under frequency
ATS will not retransfer Load T - Timer has not expired
back to Utility Automatic Exerciser is in process
S1 Utility fully or partially unacceptable
ATS does not transfer Load to S2 S2 Generator fully or partially unacceptable Set motor-saver to dropout below
(generator) Motor loads on system creating enough back- ATS Fail setpoint
EMF to keep missing phase from falling below
Fail setpoint.
S2 Generator will not start X1 or X2 not connected Check Generator Start wiring
S2 Generator will not shut down U - Timer not expired Wait for U timer to expire
Automatic Exerciser in process
All LEDs off Keypad connector unplugged at Controller
Both source breakers open
ATS will not transfer in-phase In-Phase monitor not on Turn on In-Phase monitor
Frequency difference between S1 and Adjust Generator governor to hold
S2 greater than 2Hz. freqency closer to Utility
ATS will not retain a Battery dead or missing Replace battery with a fresh industrial
Set Automatic Exerciser grade Alkaline battery
Timer/In-Phase LED constantly on Both sources locked in frequency or one Turn In-Phase monitor off
source greater than 20° out of phase
S1 and S2 LEDs Blinking Phase Rotation Mis-match between sources Rewire sources to be same rotation
S1 Position LED Blinking SN limit switch bad or intermittent Check connection or SN limit switch
S2 Position LED Blinking SE Limit switch bad or intermittent Check connection or SE limit switch
Both S1 and S2 Positioin Solenoid bad or disconnected Requires CANCEL key to clear -
LEDs Blinking ATS contactor in mid-position check Solenoid
Requires CANCEL key to clear -
Check both limit switches
Service must be performed by qualified personnel.
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.
Table 9