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N700E INSTRUCTION MANUAL
3-43
80Hz
60Hz
0.5s
Output frequency
Counter
Trip Signal
Example) b41 = 0.5s
Case1) If frequency is increased at no regeneration condition,
Cause: when a current feedback value is corrupted by noise.
Measures:
Change a b39(Filter of current F/B) and b37(D gain)
Please set the b39 between 5 and 30 (ex 5, 10, 20, 30ms)
Increasing b39 results the delay in calculating torque so b37 should be set .
Please set the b37 between 500 to 1000
Experimental values on MG-Set test are
b39: 30, b37: 1000
Case2) If overvoltage trip is occurred at normal operation,
Cause: Torque is over estimated due to motor parameter error or current sensing error.
Measures :
Change a b38(Reference Current)
Please set the b39 between 30 to 100
If this value is set too high, Frequency output can be saturated to maximum frequency.
Calculated torque output
User can monitor calculated torque by 2 methods
Parameters
Code
Name
Description
default
Run-time
Edit
C18
wAODef (FM Output selection)
0 ~ 4
0
X
C25
wAODef2(AM Output selection)
0 ~ 4
1
X