68 Product Manual PM WSC/WDC
directly operate the main motor contactors. The MCRs shall constitute the only
means of energizing the motor contacts.
8. The main contactors shall have a normally open and a normally closed auxiliary
contact rated at 125VA pilot duty at 115 VAC. An additional set of normally open
contacts shall be provided for each MCR.
9. There shall be electronic overloads in each phase set at 107% of the rated load amps
of each motor. Overloads shall be manual reset and shall de-energize the main
contactors when the overcurrent occurs. The overloads shall be adjustable and
selected for mid-range. Overloads shall be adjusted for a locked rotor trip time of 8
seconds at full voltage and must trip in 60 seconds or less at reduced voltage (33%
of delta LRA).
10. Each starter shall have a current transformer and adjustable voltage dropping
resistor(s) to supply a 5.0 VAC signal at full load to the unit control panels.
11. Each starter shall be equipped with a line-to-115 VAC control transformer, fused in
both the primary and secondary, to supply power to the control panels, oil heaters
and oil pumps.
12. Each starter shall include the following protective devices:
a) Phase failure and reversal protection
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