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9.2 CONTROLLER ERROR MESSAGE TABLE
MCU Error
Message
Meaning Remedy
NOP No motor
power
l Verify that the ‘Emergency Power Shutoff Switch’ button
on the SCU is released.
l Verify that circuit breaker inside the MSCU is switched
off caused by an error
l Check the main power source in the building.
ECD No Encoder
Signal
Check the encoder line connections to the actuators and
servo controllers
FLT Fault l Motor controller module may have a fatal damage if this
happens repeatedly.
l Replace the controller module, if necessary.
OVC Over Current l This error occurs when excessive current flows through
the controller and motor. It can occur due to the
following reasons:
a. the actuators are overloaded because of excessive
movement.
b.
excessive friction and/or abnormal vibration.
c. too much grease is put in.
l Replace the controller module or actuator as deemed
necessary.
OVT Over
Temperature
l This error appears when the temperature of the power
module on the controller is too high.
l Replace the controller module, if necessary.
OVV Over Voltage l This error appears when output voltage from the
Rectifier on the controller exceeds the standard voltage.
l Check the input voltage value.
l Replace the controller module, if necessary.
BLS Bottom Sensor
Error
TLS Top Sensor
Error
l The actuator is extending or retracting beyond it’s
normal range of motion and is tripping the Limit
Sensors on the upper and bottom stroke limits of each
actuator.
l Verify that the sensors are functioning properly.
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