Basic Troubleshooting - GE AF-650 GP Design And Installation Manual

Basic Troubleshooting

11 Basic Troubleshooting
11.1 Start Up and Operation
Symptom
Display dark/no function
Intermittent display
1 11
Motor not running
110
Possible cause
Missing input power.
Missing or open fuses, or circuit
breaker tripped.
No power to the keypad.
Shortcut on control voltage
(terminal 12 or 50) or at control
terminals.
.
Wrong contrast setting.
Display (keypad) is defective.
Internal voltage supply fault or
SMPS is defective.
Overloaded power supply (SMPS)
due to improper control wiring or
a fault within the frequency
converter.
Service switch open or missing
motor connection.
No mains power with 24 V DC
option card.
keypad Stop.
Missing start signal (Standby).
Motor coast signal active
(Coasting).
Wrong reference signal source.
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Test
See Table 3.1.
See Open fuses and Tripped circuit
breaker in this table for possible
causes.
Check the keypad cable for proper
connection or damage.
Check the 24 V control voltage
supply for terminals 12/13 to 20–39
or 20–39 V or 10 V supply for
terminals 50–55.
Test using a different keypad.
To rule out a problem in the
control wiring, disconnect all
control wiring by removing the
terminal blocks.
Check if the motor is connected
and the connection is not
interrupted (by a service switch or
other device).
If the display is functioning but no
output, check that mains power is
applied to the frequency converter.
Check if [Off] has been pressed.
Check parameter E-01 Terminal 18
Digital Input for correct setting for
terminal 18 (use default setting).
Check if a coast inv command is
programmed for the terminal in
parameter group E-0# Digital
Inputs.
Check reference signal: Local,
remote, or bus reference? Preset
reference active? Terminal
connection correct? Scaling of
terminals correct? Reference signal
available?
Solution
Check the input power source.
Follow the recommendations
provided.
Replace the faulty keypad or
connection cable.
Wire the terminals properly.
.
▲ ▼
Press [Status] + [ ]/[ ] to adjust
the contrast
Replace the faulty keypad or
connection cable.
Contact supplier.
If the display stays lit, then the
problem is in the control wiring.
Check the wiring for shorts or
incorrect connections. If the display
continues to cut out, follow the
procedure for display dark.
Connect the motor and check the
service switch.
Apply mains power to run the unit.
Press [Auto] or [Hand] (depending
on operation mode) to run the
motor.
Apply a valid start signal to start
the motor.
Apply 24 V on terminal or program
this terminal to [0] No operation.
Program correct settings. Check
parameter F-02 Operation Method.
Set preset reference active in
parameter parameter C-05 Multi-
step Frequency 1 - 8. Check for
correct wiring. Check scaling of
terminals. Check reference signal.
MG35M402