ABB GPS2436 User Manual page 16

High Voltage Shutdown (HVSD)
The rectifier senses the voltage at its output terminals. If this voltage is too high, the rectifier will shut
down to prevent the high voltage from damaging itself or the load.
Restart
Upon shutdown, the rectifier will attempt to restart. The rectifier will also accept a restart command
from the controller for a remote restart. The rectifier will attempt to restart three times before issuing
a rectifier fail alarm to the controller.
Fan Alarm and Control
The rectifier contains a cooling fan. The fan's speed, which is based on ambient temperature and
output power level, is lowered during low-load and low-temperature conditions to minimize audible
noise and maximize fan life.
Thermal Alarm
The rectifier senses the internal operating temperature and will issue a thermal alarm if the internal
temperature exceeds a safe operating level. Ambient temperatures above the maximum rating will
result in a rectifier shutdown and the issuing of a thermal alarm (TA).
Autonomous Operation
Rectifiers will continue to power the load if the controller fails or if communication is lost.
Controller Communications Alarm
When communications between the rectifier and controller are interrupted, the rectifier continues to
operate and the red Fail LED on the rectifier blinks.
Connectorized
The rectifiers provide the controller with a full complement of status and alarm signals. The rectifier
status and alarm signals, ac input, and dc output are all connectorized for easy installation and
maintenance. System connections are made when the rectifier is plugged into the shelf. No additional
connections are required.
"Forced" Load Sharing
Internal rectifier circuitry will allow rectifiers to share load in the event communication to the controller
is lost or the controller malfunctions.
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