6-57
Reducing Long-cycle Vibration
If
vibration occurs with a longer cycle than the integral time (I)
set value, it means that integral operation
is strong. The vibration will be reduced as the integral time (I) is lengthened.
Response Before adjustment
After adjustment
Time
Reducing Short-cycle Vibration
If
the vibration cycle is short and vibration occurs with a cycle approximately the same as the derivative
time
(D) set value, it means that the derivative operation is strong. The vibration will be reduced as the
derivative time (D) is shortened.
If
vibration cannot be reduced even by setting the derivative
time (D) to “0.00” (no derivative control),
then either lower the proportional gain (P) or raise the PID’s primary delay time constant.
Response Before adjustment
After adjustment
Time
H Setting the Reference Hold Function (b6)
The
reference hold or dwell function is used to temporarily hold the output frequency when starting or
stopping a motor with a heavy load. This helps to prevent stalling.
Parameter Display name Setting Units Default
Valid access levels
number
range setting
V/f
Control
V/f with
PG
Open Loop
Vector
Flux
Vector
b6-01 Dwell Ref @Start 0.0 to
400.0
Hz 0.0 Advanced
b6-02 Dwell
Time@Start
0.0 to
10.0
Sec 0.0 Advanced
b6-03 Dwell Ref @Stop 0.0 to
400.0
Hz 0.0 Advanced
b6-04 Dwell Time
@Stop
0.0 to
10.0
Sec 0.0 Advanced
These parameters cannot be changed during operation.
Advanced Operation Chapter
6
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