MHT258a (Engl.)9-13
(j) Resistor heat, braking (OB) resistor overheat
• Touch panel display
• Detection (example)
The heating power of the braking resistor of amplifier exceeded a specified value.
• Cause, check and remedy
If an alarm is detected immediately after turning on power, the power supply voltage may be higher than specified.
If detected while running, the frequency of braking operation may be high, and the braking resistor may overheat. In such a case,
• use an external braking resistor,
• prolong the accel./decel. time. or
• raise the reduction speed ratio, if possible.
(k) Over flow, deviation excessive
• Touch panel display
• Detection (example)
Deviation quantity (difference between the command position and current position after feedback) exceeded the set value of basic para. 54.
• Cause, check and remedy
The initial set value of basic para. 54 is 10000 (x100) [pulse].
If the difference between commanded position and current position after feedback exceeds 1,000,000 [pulse], an alarm is detected.
Under normal operating conditions, the deviation quantity increases in proportion to the motor speed.
If an alarm is detected when rotating the motor by turning on the [RUN], the motor power wiring phases U, V, W may not be connected to the
corresponding terminals (U, V, W) of the amplifier.
The set value of basic para. 54 need not be decreased.
The deviation can be reduced by setting the feed forward of basic para. 40 to near 1.000.
(l) Other protection functions
If following alarms appeared, contact us.
(i) Encoder heat, encoder overheat
• Touch panel display
• Detection (example)
The temperature of encoder exceeded a specified value.
• Cause, check and remedy
The ambient temperature for the motor should be 40 [°C] max.
If an alarm appeared before running such as immediately after turning on power, contact us.
To Next Page
Loading...