VLT MCD 500, Operating Instructions Manual, Page: 42 / 81

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 F1
24
VDC
22
21
6/T3
2/T1
13
14
4/T2
24
33
34
06
05
08
07
17
18
25
11
16
A6
A5
A4
5/L3
3/L2
15
S3
S1
S2
E
1/L1
+
+
5
6 7
4
2
A
3
1
1
7
7
H
A
5
2
5
.1
0
Illustration 5.13
1 Control voltage (model dependent) S1 Start/stop contact
2 24 VDC output S2 Reset contact
3 Remote control inputs S3 Auxiliary trip contact
4 Motor thermistor input (PTC only) 13, 14 Relay output A
5 Relay outputs 21, 22, 24 Relay output B
6 3-phase supply 33, 34 Relay output C
7 Motor terminals
Table 5.14
Parameter settings:
•
3-3 Input A Function
•
Select Input Trip (N/O) assigns the Input A to Auxiliary Trip (N/O) function
•
3-4 Input A Name
•
Select a name e.g. Low Pressure - assigns a name to Input A.
•
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
MG17K402 - VLT
®
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