Danfoss 102 Instruções de Operação descarregar pdf (Página 44)

Symptom Possible cause Test Solution

Motor speed

unstable

Possible incorrect parameter

settings

Check the settings of all motor parameters,

including all motor compensation settings.

For closed-loop operation, check PID

settings.

Check settings in parameter group 1-6*

Analog I/O mode. For closed-loop

operation, check settings in parameter

group 20-0* Feedback.

Motor runs

rough

Possible over-magnetisation Check for incorrect motor settings in all

motor parameters

Check motor settings in parameter groups

1-2* Motor Data, 1-3* Adv Motor Data, and

1-5* Load Indep. Setting..

Motor will not

brake

Possible incorrect settings in

the brake parameters. Possible

too short ramp-down times

Check brake parameters. Check ramp-time

settings

Check parameter group 2-0* DC Brake and

3-0* Reference Limits.

Open power

fuses or circuit

breaker trip

Phase to phase short Motor or panel has a short phase to phase.

Check motor and panel phase for shorts

Eliminate any short circuits detected.

Motor overload Motor is overloaded for the application Perform startup test and verify motor

current is within specifications. If motor

current is exceeding nameplate full load

current, motor may run only with reduced

load. Review the specifications for the

application.

Loose connections Perform pre-startup check for loose

connections

Tighten loose connections.

Mains current

imbalance

greater than

Problem with mains power (See

Alarm 4 Mains phase loss

description)

Rotate input power leads into the

frequency converter 1 position: A to B, B to

C, C to A.

If imbalanced leg follows the wire, it is a

power problem. Check mains power

supply.

Problem with the frequency

converter

Rotate input power leads into the

frequency converter 1 position: A to B, B to

C, C to A.

If imbalance leg stays on same input

terminal, it is a problem with the unit.

Contact the supplier.

Motor current

imbalance

greater than

Problem with motor or motor

wiring

Rotate output motor leads 1 position: U to

V, V to W, W to U.

If imbalanced leg follows the wire, the

problem is in the motor or motor wiring.

Check motor and motor wiring.

Problem with the frequency

converters

Rotate output motor leads 1 position: U to

V, V to W, W to U.

If imbalance leg stays on same output

terminal, it is a problem with the unit.

Contact the supplier.

Frequency

converter

acceleration

problems

Motor data are entered

incorrectly

If warnings or alarms occur, see 7.3 List of

Warnings and Alarms

Check that motor data are entered correctly

Increase the ramp-up time in 3-41 Ramp 1

Ramp Up Time. Increase current limit in

4-18 Current Limit. Increase torque limit in

4-16 Torque Limit Motor Mode.

Frequency

converter

deceleration

problems

Motor data are entered

incorrectly

If warnings or alarms occur, see 7.3 List of

Warnings and Alarms

Check that motor data are entered correctly

Increase the ramp-down time in 3-42 Ramp

1 Ramp Down Time. Enable overvoltage

control in 2-17 Over-voltage Control.

Acoustic noise

or vibration

(e.g. a fan

blade is

making noise

or vibrations

at certain

frequencies)

Resonances, e.g. in the

motor/fan system

Bypass critical frequencies by using

parameters in parameter group 4-6* Speed

Bypass

Check if noise and/or vibration have been

reduced to an acceptable limit.

Turn off over-modulation in 14-03 Overmo-

dulation

Change switching pattern and frequency in

parameter group 14-0* Inverter Switching

Increase Resonance Dampening in

1-64 Resonance Dampening

Table 7.7 Troubleshooting

Diagnostics and Troubleshoo...

VLT

HVAC Drive Operating Instructions

42 MG11AJ02 - Rev. 2013-07-31

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Danfoss 102 Instruções de Operação Página 44

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