Delta 28-299A Instruções de Operação descarregar pdf (Página 54)

2-4 Undercurrent

Range: Function:

20%* [0% -

100%]

Sets the trip point for undercurrent protection,

as a percentage of motor full load current. Set to

a level between the motor's normal working

range and the motor's magnetising (no load)

current (typically 25% to 35% of full load

current). A setting of 0% disables undercurrent

protection.

2-5 Undercurrent Delay

Range: Function:

5 secs* [0:00 - 4:00

(min:secs)]

Slows the MCD 500's response to

undercurrent, avoiding trips due to

momentary fluctuations.

7.5.3 Instantaneous Overcurrent

The MCD 500 can be configured to trip if the average current

of all three phases exceeds a specified level while the motor

is running.

2-6 Instantaneous Overcurrent

Range: Function:

400%* [80% - 600%

FLC]

Sets the trip point for instantaneous

overcurrent protection, as a percentage

of motor full load current.

2-7 Instantaneous Overcurrent Delay

Range: Function:

0 secs* [0:00 - 1:00

(min:secs)]

Slows the MCD 500's response to

overcurrent, avoiding trips due to

momentary overcurrent events.

7.5.4 Frequency Trip

The MCD 500 monitors mains frequency throughout

operation, and can be configured to trip is the frequency

varies beyond a specified tolerance.

2-8 Frequency Check

Option: Function:

Do not Check

Start Only

Start/Run

Run Only

Determines when the starter will monitor for a

frequency trip.

2-9 Frequency Variation

Option: Function:

Selects the soft starter's tolerance for frequency

variation.

Running a motor outside its specified frequency for

long periods can cause damage and premature failure.

s 2 Hz

2-9 Frequency Variation

Option: Function:

s 5 Hz

s 10 Hz

s 15 Hz

2-10 Frequency Delay

Range: Function:

1 sec* [0:01 - 4:00

(min:sec)]

Slows the MCD 500's response to

frequency disturbances, avoiding trips

due to momentary fluctuations.

NOTE

If the mains frequency drops below

35 Hz or rises above 75 Hz, the

starter will trip immediately.

2-11 Restart Delay

Range: Function:

secs*

[00:01 - 60:00

(min:secs)]

The MCD 500 can be configured to force a

delay between the end of a stop and the

beginning of the next start. During the

restart delay, the display shows the time

remaining before another start can be

attempted.

NOTE

The restart delay is measured from

the end of each stop. Changes to the

restart delay setting take effe

immediately.

2-12 Motor Temperature Check

Option: Function:

Selects whether the MCD 500 will verify the motor

has sufficient thermal capacity for a successful

start. The soft starter compares the motor's

calculated temperature with the temperature rise

from the last motor start and only operates if the

motor is cool enough to start successfully.

Do not

Check

Check

7.6 Inputs

3-1 Local/Remote

Option: Function:

Selects when the A

AUTO ON

and H

HAND ON

buttons can be used to switch to Hand On or

Auto On modes.

Lcl/Rmt

anytime

The user can change between local and

remote control at any time.

Local Control

Only

All remote inputs are disabled.

Remote Control

Only

Selects whether the starter can be used in

Hand On or Auto On modes.

Programming MCD 500 Operating Instruction

MG.17.K3.02 - VLT

is a registered Danfoss trademark 53

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