ARR Series Three Phase, Six Pulse SCR Charger
Installation
RS-420, Rev. 7
2-8
Once activated the high voltage shutdown is reset by moving the ac circuit breaker operator from the “tripped”
position to the “off” position and then to the “on” position. This will restart the charger. If the breaker trips
again, check for the cause of the high voltage condition.
Unless otherwise requested, the high voltage shutdown is factory set to 148 volts dc for a 130 volt charger or 295
volts dc for a 260 volt charger. It is recommended the that the shutdown setting be kept at least 15% above the
equalize voltage setting.
In order to check that the high voltage shutdown is properly set, follow this procedure:
1.
Disconnect the battery if possible and apply a small load, approximately 1 amp, to the charger.
2.
Place the charger in equalize and use the equalize adjustment to slowly raise the charger output voltage
to the setpoint.
3.
The ac breaker will trip when the setpoint is reached.
4.
If the high voltage shutdown is properly set per the factory levels, the ac circuit breaker will trip at 152
volts dc for a 130 volt charger or 305 volts dc for a 260 volt charger.
Note: The setpoint can be checked without tripping the ac breaker by disconnecting one of the connections to the
shunt trip coil and listening for the relay to energize or measuring voltage at the relay contact(s).
However, if these readings are not obtained, or a higher setting is desired, follow this procedure:
NOTE: Be sure to reset the charger before beginning these steps.
1.
Repeat steps 1 and 2 of the check procedure.
2.
Turn the voltage setpoint adjustment of the high voltage shutdown (alarm ) board completely
clockwise.
3.
Adjust the equalize voltage until the desired “trip” voltage is obtained.
4.
Then slowly turn the voltage setpoint adjustment counter-clockwise until the ac circuit breaker (or
relay) operates.
5.
Turn the equalize voltage down, reset the ac circuit breaker, if necessary, and repeat step 3 as a check
for the correct shutdown setting.
6.
Reconnect the shunt trip if necessary and re-set the equalize voltage when setting the high voltage
shutdown is completed.
