HOMA A Series - Manual (Page 3)

A Series
Installation, Operation & Maintenance Manual
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 +5 / -10% of the nameplate value,
frequency shall be + / - 1% 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 A 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
multiple conductors. Multiple conductor
configurations may use leads from separate
cables, or may use two conductors within one
cable. Please refer to enclosed wiring diagram
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.
Thermal switches must be wired to 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 the leads will be .5 Ohms.
Thermal leads must be connected to the thermal
overload relay located in the control panel.
Thermal switch leads must be connected to
validate warranty.
Note: All sizes of Class 1, Div. 1 pumps
for hazardous service must have thermal
switch leads connected to a current
regulated control circuit in accordance
with NEC.
SEAL PROBE WIRING
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 run
capacitors along with a start relay to operate.
Refer to the enclosed wiring diagram.
Capacitors and relays must be sized for the
specific motor.
Capacitors are sized based on reference voltage.
The run capacitor may need to be resized to
match the available field voltage. Each cap kit
shipped is supplied with a wiring diagram and
start up procedure.
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