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Motor current adjustment
The PMC driver is shipped with the motor rated current set to 0.35A/phase (and the
standstill current reduction (current cutback) ratio set to approximately 50%).
It is not necessary to adjust the current under normal operating conditions. However,
readjust the current setting in the following cases.
To reduce motor vibration Æ Reduce the motor running current
To reduce temperature rise of the motor and driver
Æ
Reduce the motor running current and the motor
To increase the motor’s standstill holding torque Æ Raise the motor’s standstill current
Holding torque can be calculated using the following formulas
(Holding torque is proportional to output current.)
Current cutback ratio (%)＝
Standstill current setting
Running current setting
× 100
Relationship between the potentiometers and the current
The relationship between the potentiometers and the current is shown below.
Motor running current
(Representative values)
0.4
0.3
0.2
0.1
0
0
1
2
3
41
2 3
Factory setting
（0.35A/phase
Output current A/phase
RUN potentiometer scale
1
2
3
01 23
4
STOP potentiometer scale
100
75
50
25
0
Down ratio %
Factory setting
（50%）
Motor standstill current
(Representative values)
Holding torque [N·m (oz-in)]＝
Maximum holding torque [N·m (oz-in)]×Current cutback ratio (%)
100
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