Power Loss 2-135
The pre-charge relay opens if the bus voltage drops below Vopen/Vmin and
closes if the bus voltage rises above Vclose.
The power loss alarm in [Drive Alarm 1] is set and the power loss timer
starts. The Alarm bit in [Drive Status 1] is set if the Power Loss bit in
[Alarm Config 1] is set.
The drive faults with a F003 – Power Loss fault if the power loss timer
exceeds [Power Loss Time] and the Power Loss bit in [Fault Config 1] is
set.
The drive faults with a F004 – UnderVoltage fault if the bus voltage falls
below Vmin and the UnderVoltage bit in [Fault Config 1] is set.
If the bus voltage rises above Vrecover for 20mS, the drive determines the
power loss is over. The power loss alarm is cleared.
If the drive is coasting and if it is in a “run permit” state, the reconnect
algorithm is run to match the speed of the motor. The drive then accelerates
at the programmed rate to the set speed.
Coast Input (PowerFlex700 Only)
This mode can provide additional ride through time by sensing the power
loss via an external device that monitors the power line and provides a
hardware power loss signal. This signal is then connected to the drive
through the “pulse” input (because of its high-speed capability). Normally
this hardware power loss input will provide a power loss signal before the
bus drops to less than Vopen.
The drive determines a power loss has occurred if the “pulse” input is
de-energized OR the bus voltage drops below Vopen. If the drive is running,
the inverter output is disabled.
The Power Loss alarm in [Drive Alarm 1] is set and the power loss timer
starts.
680V
620V
560V
305V
365V
Bus Voltage
Motor Speed
Output Enable
Power Loss
Drive Fault
Pre-Charge
480V example shown, see Tabl e 2.Z for further information.
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