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Page 12
CONTROL CIRCUITS
The HCV-7HA is a Magnetically Held type of contactor. Contactor closing is controlled by the drive unit. The
drive unit is a control board that applies a relatively high voltage to the closing coils for a short period of time to
close the contactor and then reduces the voltage to the coils for holding the contactor closed.
The HCV-7HAL is an HCV-7HA with a mechanical latch assembly installed. This is a Mechanically Latched type
of contactor. The added latch assembly contains a DC rated trip coil and an auxiliary switch with one delayed b
contact and an a contact with magnetic a blowout. For 24VDC~48VDC trip, an RC surge suppressor is supplied
separately for external installation across the a contact with the magnetic blowout. See figures 6 and 8.
Figure 4 - Drive Unit Block Diagram
OPERATION
LEGEND
CC ---- Closing Coil
1 & 2 ---- Control Power Input
Terminals
3 & 4 ---- Control Switch Input
Terminals
5 & 6 ---- Closing Coil Terminals
X ---- No Connection
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