MHT260a (Engl.)9-10
(g) Amp heat, amplifier overheat
• Keypad panel display
• Contents of alarm
The temperature of cooling-fins of the amplifier is above 100°C.
• Cause, check and remedy
The ambient temperature for the amplifier should be below +55°C. The lifetime of large-capacity capacitor in the amplifier greatly varies
depending on the ambient temperature.
In case the alarm was detected below 55°C, contact us.
(h) Encoder communication error
• Keypad panel display
• Contents of alarm
The communication is not made between 16-bit serial encoder and amplifier.
• Cause, check and remedy
The encoder wiring may be detached or disconnected.
The serial communication is performed at 4 [Mbps] of data rate. Do not extend the wiring by connecting several short cables.
Connect the encoder by optional cable or specified cables.
The encoder wiring has about 5 [V] of voltage amplitude. Do no install it in a location where a strong electric or magnetic field exists.
(i) Resistor heat, braking (DB) resistor overheat
• Keypad panel display
• Contents of alarm
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.
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