HOMA TP Series - Manual (Page 3)

TP 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 TP 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 twin
conductor. Twin conductor configuration may use
leads from separate cables, or may use two
conductors within one cable. Please refer to wiring
diagram enclosed 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. Some
non explosion proof, single phase TP pumps have
internally connected thermals which shut the pump
down in the event of over temperature condition
and do not require any external connection.
Explosion proof pumps and pumps with 7 lead
cable have thermal switches which must be wired
into the over temperature circuit of the control
panel.
Note: All sizes of Class 1, Div. 1 pumps for
hazardous service will have externally wired
thermal switches. Thermal switch leads must
be connected to a current regulated control
circuit in accordance with NEC.
Thermal switch leads must be connected to
validate warranty.
Identify thermal switch leads marked T1 and T3 in
the power or control cable. The resistance across
these leads will be .5 Ohm. These leads must be
connected to the thermal overload relay such as
the HOMA Go switch seal fail / thermal relay
(option) or other current regulated power supply /
controller.
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 (by others) 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 enclosed wiring
diagrams. Capacitors and relays must be sized for
the specific motor. Capacitors are sized based on
ideal conditions. 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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