Service manual

SECTION 8: MOTOR WIRING
17 of 33
FIGURE 15: Motor Wiring for EP-301 Pump
(Clockwise Impeller Rotation)
8.3 EP-303 Wiring
The EP-303 motor can be wired for 3 Ø,
208 V - 230 V/460 V, 60 Hz operation.
Do not directly connect the controller relay terminals to
the pump motor.
When controlled by a system control, use Contactor
Package 17A (P/N 10050011). See Page 17, Figure
16. See ROBERTS GORDON
®
System Control Manual
(P/N 10091601NA) wiring details.
Wire the pressure switch per the appropriate wiring dia-
gram in the Controller Installation Manual.
If using ROBERTS GORDON
®
ULTRAVAC™ controls,
the power to the EP-303 pump is not supplied by the
controller. Power is supplied by a separate circuit and is
switched by the controller via the Variable Frequency
Drive (VFD) 208 - 230 V only. See the ROBERTS
GORDON
®
ULTRAVAC™ Installation Manual (P/N
10081601NA) for wiring details.
FIGURE 16: EP-303 208 V - 230 V (or 460 V) 3 Ø Pump Starter Wiring Diagram
Wires 2, 3 and 8
Wire 4 to L2
Wires
1 and 5
to L1
Wire J
Note: Interchange wires 5
and 8 for counterclockwise
rotation.
Individual supply for pump rated for
total full load current (See Page 31,
Section 12.5 for details).