Rockwell Automation 1503VC IntelliVAC Plus Contactor Control Module - Manual (Page 39)

4-12 Description of Features
1503-UM054C-EN-P – June 2013
Open Coil Test
To check that there is a coil(s) connected to the IntelliVAC Plus unit
a test is performed to confirm that the coil current is greater than 200mA.
If the coil current measured is lower than this threshold then it can be
assumed that the particular Coil Under Test (CUT) is open.
If the coil is an open circuit then the IntelliVAC Plus Module Status
LED will annunciate the fault (see Table 4.F). This fault will indicate
an open coil for any of the up to five (5) contactors connected in an
MC system.
This open coil test will be performed on a regular basis only when
the contactor is not being commanded to be closed. It will be
performed for all of the up to five (5) contactors attached and will be
executed once every minute. When an open coil is found the event
will be logged to the Event Log table (see Event Log Table 4.D) and
the IntelliVAC Plus Module Status LED will be turned on. If one or
more open coils are detected and then at some point the coil(s) is no
longer found to be open, then the IntelliVAC Plus Module Status
LED will be turned off.
Below are the DeviceNet messages displayed when an open coil
condition is detected:

‘IB1 Main Coil Open’ = Present or Not Present

‘IB2 Main Coil Open’ = Present or Not Present

‘IB3 Main Coil Open’ = Present or Not Present

‘IB4 Main Coil Open’ = Present or Not Present

‘IB5 Main Coil Open’ = Present or Not Present
The following are for mechanically latched contactors only.

‘IB1Trip Coil Open’ = Present or Not Present

‘IB2 Trip Coil Open’ = Present or Not Present

‘IB3 Trip Coil Open’ = Present or Not Present

‘IB4 Trip Coil Open’ = Present or Not Present

‘IB5 Trip Coil Open’ = Present or Not Present
For the Electrically Held contactor, this test for the main coil can be
performed whenever the coil is not in the pick-up or closed mode.
For the Mechanically Latched contactor, the test for the main coil
can be performed whenever the coil is not in the close mode and for
the trip coil, whenever this coil in not being activated.