Delta VFD220C43A-21 - Page 1016

Chapter 14 Fault Codes and DescriptionsC2000 Plus
14-113
ID
Display on LCD Keypad
Fault Name
Fault Descriptions
187
Flux linkage observer
failure
(FobF)
In PMFOB mode, when the electric feedback signal is
not obvious and causing the estimated flux linkage (flux
linkage estimates to 0 V/krpm) not converging to the
exact flux linkage value, the calculated speed is not the
exact motor speed, and then the drive stops and shows
FobF.
Action and Reset
Action condition
When the drive is in PMFOC mode (Pr.00-
11 = 6) and IF switches to FOB mode,
the flux linkage estimation is ≤ 0
Action time
N/A
Fault treatment parameter
N/A
Reset method
Manual reset
Reset condition
Reset immediately
Record
Yes
Cause
Corrective Actions
IF current is too small in IF stage,
or the electric signal is small when
switching IF / FOB
Increase Pr.10-31 (IF current) or increase the switching frequency of IF / FOB
(Pr.10-39).
The acceleration time is too fast to
drive the motor in IF mode, the
motor remains stop and is driven
in FOB mode when switching IF to
FOB, in this case, the electric
signal is not obvious, and the flux
linkage easily fails
Increase acceleration time (Pr.01-12) or use the first / fourth acceleration /
deceleration switching frequency (Pr.01-23) to increase the acceleration time in
IF mode
Ke parameter is not accurate
Re-rotate and auto-tune the Ke parameter