Omron MX2 Series User Manual page 307

Operation status
PM Motor Mini-
mum Frequency
(H121) or lower
Around PM Motor
Minimum Fre-
quency (H121)
PM Motor Mini-
mum Frequency
(H121) or higher
Precautions for Correct Use
• Increasing the PM Motor Starting Current (H117) too much causes an overload. Alternatively,
doing so causes automatic carrier reduction depending on the set value.
• Decreasing the PM Motor Stabilization Parameter (H119) too much may cause an insufficient
torque, shock or overcurrent trip around the value set in PM Motor Minimum Frequency
(H121).
Multi-function Compact Inverter 3G3MX2-V1 User's Manual (I585-E1)
Phenomenon
If the motor rotation is unstable during startup, increase the
motor starting time.
Rotation is unsta-
However, setting this parameter to an excessively large
ble.
value may cause an overload. Check the value in the Elec-
tronic Thermal Load Rate Monitor (d104).
Finely adjust the motor parameters for PM motor control.
Decrease the PM Motor Parameter R value gradually,
down to 70% of the set value.
Increase the PM Motor Parameter Ld value gradually, up to
130% of the set value.
Motor is hunting or
vibrating.
Increase the PM Motor Parameter Lq value gradually, up to
130% of the set value.
* Be sure to adjust this parameter so that Ld is equal to or
less than Lq.
Decrease the PM Motor Stabilization Parameter value.
Increase the PM Motor Speed Response value.
A shock or overcur-
rent trip occurs.
Decrease the minimum frequency of the PM motor.
Decrease the PM Motor Speed Response value.
Increase the PM Motor No-Load Current value.
Increase the Carrier Frequency, if too low.
Finely adjust the motor parameters for PM motor control.
Decrease the PM Motor Parameter R value gradually,
down to 70% of the set value.
Motor is hunting or
Increase the PM Motor Parameter Ld value gradually, up to
vibrating.
130% of the set value.
Increase the PM Motor Parameter Lq value gradually, up to
130% of the set value.
* Be sure to adjust this parameter so that Ld is equal to or
less than Lq.
Decrease the PM Motor Stabilization Parameter value.
6 Vector Control and Applied Functions
Adjustment method
Adjust-
ment item
H117
H106,
H111
H107,
H112
H108,
H113
H119
H116
H121
H116
H122
b083
H106,
H111
6
H107,
H112
H108,
H113
H119
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