Homa GRP Series Manuel d'utilisateur télécharger pdf (Page 3)

GRP 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 GRP 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

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 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. Non Explosion proof GRP 10/1 to 21/1

single phase pumps have internally connected

thermals which shut 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 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 enclosed wiring

schematic. 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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GRP Series 1

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Homa GRP Series Manuel d'utilisateur Page 3

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