Parameter Reference
D-82
AC30V series Variable Speed Drive
Functional Description
When
Pwrl Enable
is set to TRUE, the block controls the behaviour of the drive during a power outage.
This is achieved by ramping the speed setpoint to zero(
Pwrl Decel Rate
).
The dc link fall detection is triggered by
Pwrl Trip Threshold. Pwrl Control Band
determines the band of dc link ( between by
Pwrl Trip
Threshold
and
Pwrl trip Thr Pwrl Control Band
) while the speed septoint is ramped down to zero using
Pwrl Decel Rate
to try
recovering the kinetic energy.
If during the outage the supply returns, the speed is automatically ramped back (
Pwrl Accel Rate
) to the speed setpoint.
The condition to validate the supply returns is met if the dc link is kept higher than (
Pwrl trip Thr Pwrl Control Band
) for more than
500ms. During this time, the speed setpoint is hold.
Pwrl Time Limit
determines the maximum time of the Power Loss Ride Through sequence. If this time is exceeded, the drive will trip on POWER
LOSS STOP.
During the Power Loss Ride Through sequence,
Pwrl Active
becomes TRUE
.
When
Pwrl Enable
is set to FALSE, the drive will trip on UNDERVOLTS if the main supply is removed.
This feature is run at a rate of 1 milli-second.
IMPORTANT:
If
Ramp Hold
feature enabled,
Pwrl Accel Rate
and
Pwrl Decel Rate
really applied to the speed setpoint are limited by
Acceleration Time
and
Deceleration Time
of the Ramp.
Ramp
Ramp Hold
Slew Rate
(V/Hz only)
Speed Setpoint path
User
Speed control loop
Power Loss
Ride Thru
