loads are being supplied and batteries are float charged. Rectifiers operate in the Constant
Voltage Mode unless load increases to the point where the product of load current and
output voltage is approximately 3000W.
• Constant Power Mode: As load increases above approximately 3000W (non-adjustable),
output current continues to increase, but output voltage decreases as required to maintain
constant output power. Rectifiers operate in the Constant Power Mode unless load
continues to increase to the point where the current limit setting is reached.
• Constant Current Mode: If load increases to the current limit setting, output voltage
decreases linearly to maintain output current at the current limit setting.
• Input Protection:
a) Input Over/Under Voltage Protection: The rectifier will shut down at low or high voltage
input; based on the following voltage levels:
1. Low Voltage Disable Point: 80V, ±5 V; hysteresis is at least15 VAC for restart.
2. High Voltage Disable Point: 305V, ±5 V; hysteresis is at least10 VAC for restart.
b) Between 85 V and 176 V the output power will be derated linearly based on the input
voltage as follows:
1. At input voltage of 85V with output >48V, max output power is 1200W.
2. At input voltage of 90V with output >48V, max output power is 1500W.
3. At input voltage of 154V with output >48V, max output power is 2642W.
4. At input voltage of 176V and output >48V, max output power is 3000W.
• Output Protection:
a) Overload / Reverse Current: The rectifier has two 63 A fuse wires in the negative output
DC bus. This fuse is not customer replaceable. The rectifier can be plugged into or pulled
out of a shelf while operating, without damage or opening the fuse.
b) Current Limiting: The rectifier has a current limit function. The current limit point can be
set between the range of 0 to 62.5 A, adjustable via the Controller. The current limit
accuracy is ±2A when the output voltage ranges from 42 to 58 V.
c) Advanced Current Limit Function: The rectifier has an advanced Current Limit Function.
When a short circuit occurs at the rectifier output terminals, the rectifier will keep its output
current at a constant value (value that is configurable via the controller). This function
effectively protects the rectifier and the equipment connected to the rectifier. When the
short circuit fault is cleared, the rectifier will automatically restore back to normal operation.
d) High Voltage Shutdown:
1. Software settable HVSD level (from controller) 56 to 59 V. The software restart hysteresis
is 0.5 V, ±0.2 V.
2. Back-up hardware HVSD (High Voltage Shut Down) at 59.5 V, ±0.5 V.
3. In the case of a second HVSD within 5 minutes (time value configurable via the controller)
the unit shall require to be manually restarted. Method of manual restart: Reset the
rectifier through the controller or remove the rectifier from the system and then re- install
the rectifier into the system.
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