8-17
• A signal is being input to the frequency reference (current) terminal 14.
When
“1F” (frequency reference) is
set for parameter H3-09 (multi-function analog input terminal 14),
a
frequency corresponding to the terminal 14 input input voltage (current) is added to the
frequency
reference. Check to be sure that the set value and analog input value are suitable.
D The motor does not rotate according to reference.
Torque
control mode
is selected. When parameter d5-01 (torque control selection) is set to “1” (torque
control), speed control cannot be executed. (Speed limits can be set.) To switch torque control and
speed
control, set parameter d5-01 to “0” (speed control) and set one of the parameters from H1-01
through H1-06 (multi-function inputs) to “71” (speed/torque control change).
H If the Slip Compensation Function Has Low Speed Precision
The slip compensation limit has been reached. With the slip compensation function, compensation
cannot
be carried out beyond the slip compensation limit set in parameter C3-03.
Check to be sure that
the set value is suitable.
H If There is Low Speed Precision at High-speed Rotation in Open-loop
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 V
AC is input, then the maximum output voltage will be 200 V
AC.) If, as a
result
of vector control, the output voltage reference value exceeds the Inverter output voltage maxi
-
mum
value, the speed precision will decrease. Either use a motor with
a low rated voltage (i.e., a spe
-
cial motor for use with vector control) or change to flux vector control.
H If Motor Deceleration is Slow
D The deceleration time is long even when control resistance is connected.
• “Stall prevention during deceleration enabled” is set. When control resistance is connected, set pa-
rameter
L3-04 (stall prevention selection during deceleration) to “0” (disabled). When this parameter
is set to “1” (enabled, the factory-set default), control resistance is not used.
• 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 parameter constants are correct and there is no overvoltage fault, then the motor
’
s power is limit
-
ed. Consider increasing the motor capacity.
• The torque limit has been reached.
When
a torque limit has been set in parameters L7-01 to L7-04, no torque will be output beyond that
limit.
This can cause the deceleration time to be too long. Check to be sure that the value set for the
torque
limit is suitable. If the torque limit has been set by multi-function analog inputs H3-05 and H3-09
(set value: 10 to 13), check to be sure that the analog input value is suitable.
Maintenance Operations Chapter
8
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