Omron SYSDRIVE 3G3FV User Manual page 231

Advanced Operation
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.
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.
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 p y
number
b6-01 Dwell Ref @Start 0.0 to
b6-02 Dwell
Time@Start
b6-03 Dwell Ref @Stop 0.0 to
b6-04 Dwell Time
@Stop
These parameters cannot be changed during operation.
Response Before adjustment
After adjustment
Response Before adjustment
Setting g Units
range
Hz 0.0
400.0
0.0 to Sec 0.0
10.0
Hz 0.0
400.0
0.0 to Sec 0.0
10.0
Time
After adjustment
Time
Valid access levels
Default
setting
V/f V/f with
Control
Advanced
Advanced
Advanced
Advanced
Chapter 6
Open Loop
PG Vector
Flux
Vector
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