HOMA CH_H Series - Manual (Page 3)

CH Series
ELECTRICAL INSTALLATION:
GENERAL GUIDELINES
All electrical work shall be carried out under the
supervision of an authorized, licensed
electrician. The present state adopted edition
of the National Electrical Code as well as all
local codes and regulations shall be
complied with.
VERIFICATION OF POWER SUPPLY
Prior to making any electrical connections or
applying power to the pump, compare the power
supply available at the pump station to the data
on the unit's nameplate. Confirm that both
voltage and phase match between pump and
control panel. The voltage supplied at the pump
shall be plus or minus 10% of the nameplate
value, frequency shall be plus or minus 5% of
the nameplate value, the voltage phase balance
shall be within 1% and the maximum corrected
power factor shall be 1.0.
POWER LEAD WIRING
HOMA CH Series pumps may be provided with
1 or more cables, depending on motor
horsepower and operating voltage. Power leads
L1, L2, & L3 may be provided as single
conductor, or as two conductor. Two conductor
configuration may use leads from two separate
cables, or may use two conductors within one
cable. Please refer to wiring diagram in the
appendix for specific connection details. The
pump must be connected electrically through a
motor starter with proper circuit breaker
protection in order to validate warranty. Do not
splice cables.
THERMAL SWITCH WIRING :
Pumps are equipped with thermal switches
embedded in the stator windings which are
normally closed, automatically resetting
switches. Switches will open when the internal
temperature rises above the design temperature,
and will close when the temperature returns to
normal. Smaller CH pumps have internally
connected thermal switches. These units will
not have cable leads marked T1 & T3. Larger
CH pumps, and all Explosion Proof pumps will
have the thermal
switches configured for external control. Pumps
with external thermal switch connections must
be wired by a current regulated control circuit in
accordance with the NEC. Identify thermal
switch leads marked T1 and T3 in the power or
control cable. The resistance across these
leads will be .5O. These leads must be
connected to the thermal overload relay located
in the control panel. Thermal switch leads must
be connected to validate warranty.
SEAL PROBE WIRING (OPTIONAL)
The mechanical seal leak detector probe utilized
in the pump is a conductive probe which is
normally open. The intrusion of water into the
seal chamber completes the electrical circuit.
Control panel provisions will sense this circuit
closure, and will provide indication or alarm
functions depending on the panel design.
Either single or dual wire systems may be
provided. Single wire systems utilize one
energizing conductor, and the pump casing and
neutral lead as the ground or return portion of
the circuit. The dual wire systems utilize two
separate conductors for each leg of the circuit.
With either system, the seal probe leads must be
wired into a control circuit provided in the control
panel. This control circuit must energize the
probe with a regulated power source, and sense
the closed circuit in event of water intrusion.
Indication and alarm functions must also be
provided in the control circuit. Please see
control panel wiring diagram for seal probe
connection points. IMPORTANT: For
Hazardous Area Classification Pumps, leak
detector circuit must be in conformance with
applicable NEC codes and regulations.
START / RUN CAPACITORS AND RELAYS:
All single phase motors require start and/or run
capacitors to operate. Refer to the wiring
schematics in the appendix. Capacitors and
relays must be sized for the specific motor.
Please refer to nameplate for verification of
capacitor sizing.
Pg. 3
Installation, Operation & Maintenance Manual