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7.4 Troubleshooting

Symptom Possible cause Test Solution

Display

dark/No

function

Missing input power

See Table 4.5

Check the input power source.

Missing or open fuses or circuit

breaker tripped

See open fuses and tripped circuit breaker

in this table for possible causes

Follow the recommendations provided.

No power to the LCP Check the LCP cable for proper connection

or damage

Replace the faulty LCP or connection cable.

Shortcut on control voltage

(terminal 12 or 50) or at control

terminals

Check the 24 V control voltage supply for

terminals 12/13 to 20-39 or 10 V supply for

terminals 50 to 55

Wire the terminals properly.

Wrong LCP (LCP from VLT

2800 or 5000/6000/8000/ FCD

or FCM)

Use only LCP 101 (P/N 130B1124) or LCP

102 (P/N 130B1107).

Wrong contrast setting

Press [Status] + [

▲

]/[

▼

] to adjust the

contrast.

Display (LCP) is defective Test using a different LCP Replace the faulty LCP or connection cable.

Internal voltage supply fault or

SMPS is defective

Contact supplier.

Intermittent

display

Overloaded power supply

(SMPS) due to improper control

wiring or a fault within the

frequency converter

To rule out a problem in the control wiring,

disconnect all control wiring by removing

the terminal blocks.

If the display stays lit, then the problem is

in the control wiring. Check the wiring for

short circuits or incorrect connections. If

the display continues to cut out, follow the

procedure for display dark.

Motor not

running

Service switch open or missing

motor connection

Check if the motor is connected and the

connection is not interrupted (by a service

switch or other device).

Connect the motor and check the service

switch.

No mains power with 24 V DC

option card

If the display is functioning but no output,

check that mains power is applied to the

frequency converter.

Apply mains power to run the unit.

LCP Stop Check if [Off] has been pressed Press [Auto On] or [Hand On] (depending

on operation mode) to run the motor.

Missing start signal (Standby)

Check 5-10 Terminal 18 Digital Input for

correct setting for terminal 18 (use default

setting)

Apply a valid start signal to start the

motor.

Motor coast signal active

(Coasting)

Check 5-12 Coast inv. for correct setting for

terminal 27 (use default setting)..

Apply 24 V on terminal 27 or program this

terminal to No operation.

Wrong reference signal source Check reference signal: Local, remote or

bus reference? Preset reference active?

Terminal connection correct? Scaling of

terminals correct? Reference signal

available?

Program correct settings. Check

3-13 Reference Site. Set preset reference

active in parameter group 3-1* References.

Check for correct wiring. Check scaling of

terminals. Check reference signal.

Motor running

in wrong

direction

Motor rotation limit

Check that 4-10 Motor Speed Direction is

programmed correctly.

Program correct settings.

Active reversing signal Check if a reversing command is

programmed for the terminal in parameter

group 5-1* Digital inputs..

Deactivate reversing signal.

Wrong motor phase connection

See 5.5 Checking Motor Rotation.

Motor is not

reaching

maximum

speed

Frequency limits set wrong

Check output limits in 4-13 Motor Speed

High Limit [RPM], 4-14 Motor Speed High

Limit [Hz] and 4-19 Max Output Frequency.

Program correct limits.

Reference input signal not

scaled correctly

Check reference input signal scaling in 6-0*

Analog I/O Mode and parameter group 3-1*

References. Reference limits in parameter

group 3-0* Reference Limit.

Program correct settings.

Diagnostics and Troubleshoo...

VLT

HVAC Drive Operating Instructions

MG11AJ02 - Rev. 2013-07-31 41

7 7

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