Error Messages And Troubleshooting; General; Fault - TECO-Westinghouse MA7200 PLUS Installation Manual

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.
LCD Display
(English)
Fault
The main circuit DC voltage is
DC Volt. Low lower than the low voltage
detection level (Cn-39).
The inverter output current
becomes approx. 200% and
Over Current
above the inverter rated current.
A ground fault occurs at the inverter
output side and the ground-fault
Ground Fault
current exceeds approx. 50% of the
inverter rated current.
The main circuit DC voltage
becomes excessive because of
Over Voltage regeneration energy caused by
motor decelerating.
The temperature of the heatsink
Over Heat reaches the detection level.
Motor overload is detected by the
Motor Over Load electronic thermal relay.
(motor protection)
TECO – Westinghouse Motor Company
Table 10.1.1.1 Fault Messages, Causes and Remedies
Fault Description
Fault
Contact Fault Causes
Output
Power capacity is too

small.
Voltage drop due to

wiring resistance.
A motor of large capacity

ON
connected to the same
power system has been
started.
Defective electromagnetic

contactor.
Extremely rapid accel.

Short-circuit or ground- fault

at the inverter output side.
Motor capacity greater

ON
than the inverter rating.
High-speed motor and

pulse motor has been
started.
Motor dielectric strength is

ON insufficient.
Load wiring is not proper.

Insufficient deceleration

time.
ON High input voltage

compared to motor rated
voltage.
Defective cooling fan.

Ambient temperature too

ON
high
Clogged filter.

Overload at low speed

operation or extended accel.
time.
ON
Improper V-f

characteristic setting
Fault Messages, Causes and Remedies Cont.
MA7200 PLUS Operating Manual
Remedy
Check the source voltage and wiring.

Check the power capacity and power

system.
Extend the accel. time.

Check the load wiring.

Increase inverter capacity

Check the motor wiring impedance and
the load wiring.
Extend the accel. time.

Use a braking resistor.

Check for the fan, filter and the ambient
temperature.
Measure the temperature rise of the

motor.
Decrease the output load.

Set proper V/f characteristic.

Cont.