Delta 28-299A Instruções de Operação descarregar pdf (Página 70)

Symptom Probable Cause

AAC adaptive acceleration control, DC brake

and Jog functions not working

These features are only available with in-line installation. If the MCD 500 is installed inside

delta, these features will not operate.

A reset does not occur after an Auto-Reset,

when using a remote 2-wire control.

The remote 2-wire start signal must be removed and reapplied for a re-start.

Remote start/stop command is overriding Auto

Start/Stop settings when using remote 2-wire

control.

Auto Start/Stop function should only be used in HAND ON mode or in tandem with

HAND OFF mode, 3 and 4-wire control.

After selecting AAC the motor used an ordinary

start and/or the second start was different to

the first.

The first AAC start is current limit so that the starter can learn from the motor character-

istics. Subsequent starts use AAC.

Non-resettable THERMISTOR CCT trip, when

there is a link between Thermistor input 05, 06

or when the motor thermistor connected

between 05, 06 is permanently removed.

The thermistor input is enabled once a link is fitted and short circuit protection has

activated.

Remove the link then load the default parameter set. This will disable the thermistor input

and clear the trip.

Place a 1k2 ˖ resistor across the thermistor input.

Turn thermistor protection to 'Log only' (Par. 16-9).

Parameter settings cannot be stored. -

Make sure you are saving the new value by pressing the O

button after adjusting a

parameter setting. If you press B

BACK

, the change will not be saved.

Check that the adjustment lock (Par. 15-2) is set to Read/Write. If the adjustment lock is

on, settings can be viewed but not changed. You need to know the security access code

to change the adjustment lock setting.

The EEPROM may be faulty on the Main Control PCB. A faulty EEPROM will also trip the

soft starter, and the LCP will display the message Par. Out of Range. Contact your local

supplier for advice.

Troubleshooting MCD 500 Operating Instruction

MG.17.K3.02 - VLT

is a registered Danfoss trademark 69

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Delta 28-299A Instruções de Operação Página 70

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