c. Remove any possible source of heat
2. Measure the output current
a. Reduce the load
b. Lower setting in C6-00 ( Carrier
Frequency Option )
3.Replace the cooling fan
Motor Overheat
The temperature signal
from motor temperature
sensor via the terminal MT
exceeded the overheat
detection level of the drive.
1. Incorrect motor
temperature input (terminal
MT) wiring
2. Fault on the machinery (e.g.,
machinery is locked up)
3. Motor overheat
1. Correct the wiring for terminal MT.
2. Check the machinery status
3. Check the load, acceleration /
deceleration time and cycle time
a. Reduce the load.
b. Increase the C1-00 to C1-07
(Acc./Dec. Time) settings
c. Adjust d1-02 to d1-11 (V/F
Characteristics)
Overtorque Detection 1
The current has exceeded
the torque level set to P6-01
for longer than the time set
to P6-02
1. Incorrect parameter settings
2. Malfunction on machinery
1. Reset P6-01 and P6-02
2. Check machinery and load status
Overvoltage
Voltage in the DC bus
exceeded the overvoltage
detection level
1.200 V class: 410 V
2.400 V class: 820 V
1. Drive input power has surge
voltage entering
2. Machinery output short
circuit
3. Ground fault in the output
circuit causes the DC bus
capacitor to overcharge
4. Electrical signal interference
causes drive malfunction
5. PG cable is disconnected
6. Incorrect PG cable wiring
7. PG encoder wiring is
interference by electrical
signal
1. Install a DC link choke
Voltage surge can result from a
thyristor convertor and phase
advancing capacitor using the same
input power supply
2. Check the motor power cable, relay
terminals and motor terminal box
3. Correct grounding shorts and
reapply power
4. Check the solutions for interference
suppression
»Check the control circuit lines, main
circuit lines and grounding wiring.
»If the MC is the source of
interference, connect a suppressor to
it.
5. Reconnect the cable
6. Correct the wiring
7. Separate the wiring from the source
of the electrical signal interference. It
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