WEG CFW-09 User Manual page 233

CHAPTER 7 - DIAGNOSTICS AND TROUBLESHOOTING
PROBLEM
Motor speed
varies (oscillates)
Motor speed too
high or too low
Motor does not
reach rated speed or
it starts to oscillate
at rated speed for
P202 = 3 or 4 - Vector
Display OFF
Motor does not enter
the field weakening
range
(for P202 = 3 or 4)
Motor speed too
low and P009 = P169
or P170 (motor with
torque limitation),
for P202 = 4 -
Vector with encoder
234
POINT TO BE
CHECKED
Loose Connections 1. Disable the inverter, switch OFF the supply voltage and tighten all connections.
2. Check if all internal connection is tightened.
Speed 1. Replace the speed potentiometer.
Potentiometer
Variation of the 1. Identify the cause of the variation.
external analog
reference
Parameters not set 1. Refer to chapter 6, parameters P410, P412, P161, P162, P175 and P176.
correctly (for P202 = 3 or 4)
Programming error 1. Check if the contents of P133 (Min. Speed) and P134 (Max. Speed) are according
(reference limits)
Signal of the 1. Check the control signal level of the reference.
reference control 2. Check the programming (gains and offset) in P234 to P247.
Motor Nameplate Data 1. Check if the used motor meets the application requirements.
1. Reduce P180 (set to 90 to 99 %).
Connection of the 1. Check the Keypad connections to the inverter.
Keypad
Power Supply voltage 1. The power supply voltage must be within the following ranges:
Blown Fuse(s) 1. Replace the fuse(s).
1. Set P180, between 90 % and 99 %.
Encoder signals or Check the signals A - A, B - B according to figure 8.7. If this connections are
power connections correct invert two output phases, for instance U and V. Refer to figure 3.9.
Table 7.2 (cont.) - Troubleshooting
CORRECTIVEACTION
to the motor and the application.
220-230 V power supply: - Min: 187 V
- Max: 253 V
380-480 V power supply: - Min: 323 V
- Max: 528 V
500-600 V power supply: - Min: 425 V
- Max: 660 V
660-690 V power supply: - Min: 561 V
- Max: 759 V