GE Industrial Solutions GPS 4812_24 - Manual (Page 39)

Galaxy Power System 4812/24
Issue 9 Januray 2008 Rectifiers 4 - 3
Features
Output Current
“Walk-in”
This circuit controls the time (up to eight seconds) required for the
rectifier to reach normal operating conditions after it is turned on. This
feature minimizes the starting surge on the customer's power source.
Output Protection Rectifier is equipped with an internal fuse for plant protection if a fault
occurs in a rectifier.
Electronic Current
Limit
When the output current tends to increase above the current limit set
point, the current limit circuit overrides the voltage regulating signal and
safely limits the output current of the rectifier, thus preventing damage
to itself or the load.
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 ALM LED on
the rectifier blinks.