Omron SYSDRIVE 3G3RV, User Manual

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Troubleshooting
7-
19
n
The analog frequency reference bias setting is wrong (the gain setting is wrong).
The
frequency reference bias set in parameter H3-03 is added to the frequency reference. Check to be sure that
the
set value is suitable.
n
A signal is being input to the frequency reference (current) terminal A1.
When
1F (frequency reference) is set for parameter H3-09 (Multi-function Analog Input Terminal A2 Func-
tion
Selection), a frequency corresponding to the terminal A2 input voltage (current) is added to the frequency
reference.
Check to be sure that the set value and analog input value are suitable.
K
K K
K
If the Slip Compensation Function Has Low Speed Precision
If
speed control accuracy is low for the slip compensation function, the slip compensation limit has been
reached.
With the slip compensation function, compensation cannot be carried out beyond the slip compensa-
tion
limit set in parameter C3-03. Check to be sure that the set value is suitable.
K
K K
K
If There Is Low Speed Control Accuracy at High-speed Rotation in Open-
loop Vector Control Mode
The
motor's rated voltage is high.
The
Inverter's maximum output voltage is determined by its input voltage. (For example, if 200 VAC is input,
then
the maximum output voltage will be 200 VAC.) If, as a result of vector control, the output voltage refer-
ence
value exceeds the Inverter output voltage maximum value, the speed control accuracy will decrease. Use
a
motor with a low rated voltage (i.e., a special motor for use with vector control), or change to flux vector
control.
K K K K
If Motor Deceleration Is Slow
Use
the following information when the motor deceleration is slow.
n
The deceleration time is long even when braking resistor is connected.
The
following causes are possible.
“Stall prevention during deceleration enabled” is set.
When
braking resistor is connected, set parameter L3-04 (Stall Prevention Selection during Deceleration) to 0
(disabled)
or 3 (with braking resistor). When this parameter is set to 1 (enabled, the factory setting), braking
resistor
does not fully function.
The deceleration time setting is too long.
Check
the deceleration time setting (parameters C1-02, C1-04, C1-06, and C1-08).
Motor torque is insufficient.
If
the parameters are correct and there is no overvoltage fault, then the motor's power is limited. Consider
increasing
the motor capacity.