HOMA CTP Series - Manual (Page 3)

CTP 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 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 CTP 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 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
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 CTP 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 Class1, Div. I 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 the 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 wiring
schematics in the appendix. 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. Pg.3