MA7200 PLUS Operating Manual
TECO – Westinghouse Motor Company Fault Messages, Causes and Remedies
Cont.
10.0 Error Messages and Troubleshooting
10.1 General
The MA7200 PLUS has basically two modes of operation when a problem occurs during operation; A Fault or a
Warning.
10.1.1 Fault
When a Fault occur, the Fault code is displayed on the Digital Operator and the Fault output contact (RA-RB-RC or
R1A-R1B-R1C, DO1, DO2 or R2A-R2C) activates. The inverter shuts off and the motor stops. In order to restart the
Inverter, the Fault must be identified and cleared and then the Reset key on the Digital Operator can be pressed or
the digital input to terminal 4 can be activated. The main power to the inverter can also be cycled.
The following Table 10.1.1.1shows the Fault display on the Digital Operator, the Fault description, the possible cause
and suggested remedy.
Table 10.1.1.1 Fault Messages, Causes and Remedies
LCD Display
(English)
Fault
Fault Description
Fault
Contact
Output
Fault Causes
Remedy
DC Volt. Low
The main circuit DC voltage is
lower than the low voltage
detection level (Cn-39).
ON
Power capacity is too
small.
Voltage drop due to
wiring resistance.
A motor of large capacity
connected to the same
power system has been
started.
Defective electromagnetic
contactor.
Check the source voltage and wiring.
Check the power capacity and power
system.
Over Current
The inverter output current
becomes approx. 200% and
above the inverter rated current.
ON
Extremely rapid accel.
Short-circuit or ground- fault
at the inverter output side.
Motor capacity greater
than the inverter rating.
High-speed motor and
pulse motor has been
started.
Extend the accel. time.
Check the load wiring.
Increase inverter capacity
Ground Fault
A ground fault occurs at the inverter
output side and the ground-fault
current exceeds approx. 50% of the
inverter rated current.
ON
Motor dielectric strength is
insufficient.
Load wiring is not proper.
Check the motor wiring impedance and
the load wiring.
Over Voltage
The main circuit DC voltage
becomes excessive because of
regeneration energy caused by
motor decelerating.
ON
Insufficient deceleration
time.
High input voltage
compared to motor rated
voltage.
Extend the accel. time.
Use a braking resistor.
Over Heat
The temperature of the heatsink
reaches the detection level.
ON
Defective cooling fan.
Ambient temperature too
high
Clogged filter.
Check for the fan, filter and the ambient
temperature.
Motor Over Load
Motor overload is detected by the
electronic thermal relay.
(motor protection)
ON
Overload at low speed
operation or extended accel.
time.
Improper V-f
characteristic setting
Measure the temperature rise of the
motor.
Decrease the output load.
Set proper V/f characteristic.
Cont.