Delta 28-299A Operations Instructions download pdf (Page 39)

5.11 Auxiliary Trip Circuit

In normal operation the MCD 500 is controlled via a remote two wire signal (terminals 17, 18).

Input A (terminals 11, 16) is connected to an external trip circuit (such as a low pressure alarm switch for a pumping system).

When the external circuit activates, the soft starter trips, which stops the motor.

KM1

VDC

6/T3

2/T1

4/T2

5/L3

3/L2

1/L1

6 7

177HA525.10

Control voltage (model dependent) S1 Start/stop contact

24 VDC output S2 Reset contact

Remote control inputs S3 Auxiliary trip contact

Motor thermistor input (PTC only) 13, 14 Relay output A

Relay outputs 21, 22, 24 Relay output B

3-phase supply 33, 34 Relay output C

Motor terminals

Parameter settings:

•

Par. 3-3 Input A Function

•

Select Input Trip (N/O) assigns the Input A to Auxiliary Trip (N/O) function

•

Par. 3-4 Input A Name

•

Select a name e.g. Low Pressure - assigns a name to Input A.

•

Par. 3-8 Remote Reset Logic

•

Select as required e.g. Normally Closed - the input behaves like a normally closed contact.

Application Examples MCD 500 Operating Instruction

38 MG.17.K3.02 - VLT

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Delta 28-299A Operations Instructions Page 39