Rockwell Automation Publication 1503-UM053C-EN-P - March 2015
27
Installation and Wiring
Chapter 3
Mechanical Latch Contactors
Capacitor Trip
The IntelliVAC can be configured to provide capacitor trip functionality with
mechanical latch contactors. A capacitor must be connected to the IntelliVAC
(terminals #1 and #2) to provide this capability. The capacitor provides control
power for the IntelliVAC and stored energy to trip the contactor. Maximum
recommended capacitor size is 1650 μF for 120V control or 330 μF for 240V
control. Use of larger capacitors is not recommended
The IntelliVAC must receive an ‘OPEN’ command within a few seconds of
losing AC control power. This time limit depends on voltage and capacitor size as
shown in
Table 7
. If the elapsed time exceeds this limit, the contactor cannot be
tripped by IntelliVAC. In this case, the contactor can be tripped by pressing the
release button on the door in front of the contactor.
A separate voltage source is required to provide the ‘OPEN’ command. This can
be taken from the external capacitor as shown in
Figure 14 on page 28
.
Table 7 - Mechanical Latch Contactor – Capacitor Trip Times (after loss of control power)
Contactor
Rating
Nominal Voltage
(Vac)
Actual
V
input
(Vac)
Ext. Capacitor
(
μ
F)
Max. time
for trip (sec)
120
3.5
120
110
1650
2.7
400 Amp
100
1.7
240
140
330
7.5
200
4.7
IMPORTANT
Minimum capacitor voltage ratings:
•
120V applications – 200V DC (250V DC preferred)
•
240V applications – 400V DC (450V DC preferred)
Summary of Contents for Allen-Bradley IntelliVAC 1503VC-BMC5
Page 1: ...IntelliVAC Contactor Control Module Catalog Number Bulletin 1503VC Series E User Manual...
Page 6: ...6 Rockwell Automation Publication 1503 UM053C EN P March 2015 Summary of Changes Notes...
Page 40: ...40 Rockwell Automation Publication 1503 UM053C EN P March 2015 Chapter 6 Spare Parts Notes...
Page 45: ......