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1.11.1 Voltage Control
The rectifier voltages are set by the system monitor via the serial communications bus. The rectifier voltage can be
set to any value between 43V and 60V. The monitor operates in several modes that will affect the rectifier voltage
setting.
Float Voltage Mode (AVC Off)
The monitor sets the float voltage to its target level at start up, and then resends this same level at regular
intervals thereafter. The voltage control is open loop.
Float Voltage Mode (AVC On)
The monitor sets the system voltage to its target float voltage, then monitors the system voltage and adjusts
rectifier voltages to maintain the system voltage at the desired float voltage.
Equalize Voltage Mode
The monitor sets the system voltage to an elevated level (e.g. 56V) for a fixed period, and then resets the
system voltage to the float voltage setting.
Fast Charge Mode
The monitor sets the system voltage to an elevated level after a battery discharge. This keeps the rectifiers
in current limit for a longer period, leading to a faster battery recharge. When the battery is recharged, the
monitor resets the system voltage to the float voltage level.
1.11.2 Rectifier Alarm states
The rectifier will report the following states to the monitor via the serial communications:
AC Fail
The AC supply is not present at the rectifier.
Rectifier Fail
The rectifier is not functioning. This could be due to high output voltage, AC
failure or a fault with the rectifier internally.
Over Temperature
The internal temperature of the rectifier is too high and the rectifier has begun
to limit its output to control this temperature.
Fan Fail
The fan has ceased to work.
Current Limit
The rectifier output has reached maximum capacity and the output current is
being limited.
Shutdown
The rectifier has been shutdown by the monitor. It will restart again in 5
minutes unless the shutdown instruction is repeated.
EEPROM Fault
The rectifier microprocessor has encountered an error while writing to
EEPROM.
Soft Start
The rectifier has just turned on and is slowly increasing its output.
1.11.3 Rectifier Shutdown
The rectifier can be remotely forced to shut down, via the serial communications, by the system monitor and/or
remote supervisory software. The rectifier will shut down for 5 minutes then restart. If a further shutdown signal is
received by the rectifier before the 5 minutes is up, the timer will reset to 5
minutes. Hence, if a rectifier is to be kept shutdown a shutdown signal must be sent to it at regular intervals.
Rectifier Installation Manual
Page 5 of 10
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