Rockwell Automation 1503VC IntelliVAC Plus Contactor Control Module - Manual (Page 26)

Installation 3-3
1503-UM054C-EN-P – June 2013
Figure 3.2 – Typical Mounting Configurations
Note:
Adjacent IntelliVAC modules may be mounted with a
minimum separation of 6.4 mm (0.25 inches).
Control with Solid-State Devices
If control devices that employ electronic or suppressed output
circuits are used in the rung(s) that control the inputs to the
IntelliVAC, alternate arrangements may be required. Devices
employing transistor or triac output circuits have finite impedance
and allow a leakage current to flow in the blocking or off state.
Some PLC and I/O modules with relay outputs also have R-C
snubber circuits across the contacts to suppress noise generated
during contact opening. The impedance of these circuits also allows
leakage current to flow when the contacts are open. The high
impedance input circuits of the IntelliVAC Plus have been designed
to minimize sensitivity to these leakage currents, however, they may
be triggered by excessive leakage current or residual terminal
voltage, causing unintended operation of the contactor, or
maintenance of the closed state when the control signal is removed.