Rockwell Automation 1503VC IntelliVAC Plus Contactor Control Module - Manual (Page 32)

Description of Features 4-5
1503-UM054C-EN-P – June 2013
Time. If the contactor did not close within 200mS then there is a
major problem and it probably would not pick up any time after that.
A contactor should, if it does not have any mechanical or electrical
problems, close within 150mS. If a contactor requires longer than
150mS to close, then this is a sign that it is beginning to have problems.
This condition, although it does not cause any faults or warnings,
will be logged to the Event Log (see Event Log in Chapter 4).
To determine component wear of the contactor over its lifetime, the
close time will be monitored as a wear indicator. To perform this
measurement the close time will be averaged over the last 5 closures
and when the present value has exceeded the table value threshold,
then, an extended close time alarm will be annunciated. See Table
4.F – Plus Fault/Warning Description for the warning description
and Table 4.G – Contactor Extended Close Times for limits which
define an extended close time.
Anti-Kiss
The IntelliVAC Plus has an anti-kiss protection feature. This feature
will ensure that the main contacts are closed and sealed before they
are allowed to open. The IntelliVAC Plus makes all decisions on
whether to open or close the contactor. Once a contactor has been
commanded to close, it cannot be commanded to open until it has
actually closed first. To determine if the contactor has actually
closed, it monitors the contactor Auxiliary input at terminals TB
11/12 (see table 5.B). The IntelliVAC Plus will wait for a ‘contactor
closed’ status before issuing an open command, assuming that an
active open command has become issued shortly after a close
command has been issued. Open and close commands are also
available from the DeviceNet network as status bits (see Appendix E
for details). The basic rule for this feature is that the removal of the
Close command must have at least a 200mS delay from the time that
a Close command was initiated, even if the Auxiliary status indicates
that the contactor has closed before the 200mS time.
Anti-Pumping
Anti-pumping protection is intended to prevent the contactor from
rapid open-close cycling due to an inappropriate or faulty control
circuit, a faulty holding coil or control electronics, or the failure of a
latch mechanism to engage.
The input control signal is required to toggle before issuing another
close command. If the contactor receives a signal to close, and the
contactor closes, but immediately opens, the close command will be
ignored unless the close command is removed and re-applied.
Re-Closing Control
Features