5
Type NR oil switch installation and operation instructions
INSTALLATION AND OPERATION INSTRUCTIONS
MN230008EN November 2016
Three-wire control with holding switch
If the controlling switch is energized for less than the
required 4.5 seconds, a factory-installed holding switch
accessory is required. However, the control circuit must
be energized for at least one second for each operation
to insure operation of the holding switch. A connection
diagram for a three-wire control with a holding switch is
shown in Figure 4.
Figure 4 . Three-wire control with holding switch
Switch operation
Electrical operation
The switch may be opened and closed electrically by
applying rated control voltage to the proper terminals of the
actuator terminal block.
If the switch actuator does not respond to an electrical
operating signal, it may be that the main switch contacts are
not in synch with the electrical control. For example,
if the switch is manually opened, an electrical OPEN signal
must be transmitted to bring the control into synch with the
switch contacts before an electrical CLOSE signal will close
the switch. The converse is also true.
Manual operation
WARNING
Never manually close this switch into a faulted line . The
make-and-latch rating of the switch applies only when
it is electrically operated . Closing a switch manually on
a faulted line can result in death, severe personal injury,
and equipment damage .
G127 .0
The switch may be manually opened by operating the yellow
handle under the sleet hood.
