n055 : Momentary Power Loss Ride-thru
Protection
The setting of this parameter either enables or disables the ride-thru feature of the
drive. If disabled, the unit will stop immediately whenever a power loss occurs. If enabled,
the drive will continue to operate during a momentary power loss of up to 80%, but if the
loss exceeds the identified time period, the drive will stop.
n059 : Power Loss Ride-Thru Factory setting: See Table A3-1
Deactivation Time
Range: 0.0 to 2.0 seconds
(PwrL Ridethru t)
If the loss exceeds the length of time identified by n059, the drive will stop. The factory
setting of this parameter, in 0.1 second increments, is related to the drive’s rating.
Note that the RUN command must be maintained throughout the ride-thru period. If n055
is set to "CPU Power Active" (" 2 "), a " Uv Undervoltage " alarm is displayed during power
loss, and no fault signal is output at terminals M1 & M2 or MA, MB & MC.
5-26
5.17 MOMENTARY POWER LOSS RIDE-THRU
LED Setting LCD Setting Description
0* Not Provided* Disabled (Factory setting)
1 2 Seconds Max Enabled – 2 sec. power loss ride-thru
2 CPU Power Active Enabled – indefinite power loss ride-thru,
provided control power is maintained
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