2-136 Power Loss
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.
The pre-charge relay opens if the bus voltage drops below Vopen and closes
if the bus voltage rises above Vclose.
If the “pulse” input is re energized and the pre-charge relay is closed, the
drive determines the power loss is over. The power loss alarm is cleared.
If the drive 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.
Decel Input (PF700 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 determine 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 inertia ride through function is activated. The
load is decelerated at just the correct rate so that the energy absorbed from
the mechanical load balances the losses and bus voltage is regulated to the
value Vmem.
If the output frequency drops to zero or if the bus voltage drops below
Vopen or if any of the “run permit” inputs are de-energized, the inverter
output is disabled and the motor coasts.
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 [E238 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.
The pre-charge relay opens if the bus voltage drops below Vopen and closes
if the bus voltage rises above Vclose.
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