©Copyright 2014 Liberty Pumps Inc. All rights reserved 9
4-2
CONTROL PANELS
Liberty Pumps LEH-Series Sewage pumps must be controlled by an approved control panel in compliance with
the safety and control requirements of 2006/42/EC. Installation and connections are specific to the control panel.
Control panels should be installed and serviced only by a qualified electrician.
To prevent serious damage to the pump, follow wiring diagram
included with control panel. If diagram is missing, do not
connect the pump until you have obtained diagram from control
panel manufacturer.
4-3
BEFORE ENERGIZING PUMP, DO THE FOLLOWING:
1.
Check that all field and factory made connections are tight. Factory connections may have loosened due to
shipping and handling vibrations.
2.
Check the security of mounting hardware.
3.
Check the enclosure to see that it has not been damaged.
4.
Rotate the impeller by hand to verify movement and lubricate the seals.
5.
Ensure that no wires or other obstructions are in the way of the impeller.
6.
Motor Overload Protection:
a. 1-Phase pumps are protected from locked rotor and running overloads by a thermal overload integral
to the motor. No adjustments are required.
b. 3-Phase pumps must be protected
from locked rotor and running
overloads by an external thermal
overload device located in the control
panel. Adjust the device to the Full
Load Amps, value found in Table 2 at
right, of the pump being installed
prior to operation.
7.
Confirm that all grounding connections have
been properly made.
8.
When a panel is used, all debris, scrap wire, etc. must be removed from the control panel interior before
closing the doors. When closing doors, make certain that no wires are pinched and that all enclosure parts
are properly aligned and tightened.
For 3-phase pumps, check for proper rotation before
installing pump into basin. Failure to check rotation can
result in pump not performing as designed, resulting
pump damage and flooding. See figure D for proper
rotation
.
TABLE 2: CURRENT OVERLOAD SPECIFICATIONS
Model
Full Load
Amps
Overload
Range (A)
Overload
Manufacturer
LEH153MX-3E
13.2
9-14
Schneider
LEH154MX-3E
4.9
4-6.3
Electric
LEH203MX-3E
13.2
9-14
GV2 Series
LEH204MX-3E
5.2
4-6.3
or Equivalent
When power is first applied to a control panel or
breaker that has a pump installed, serious injury or
damage can occur if there are faults in the pump
from improper installation. Have a licensed
electrician present when the control panel is first
energized.
Fig. D – Proper impeller rotation
To check three phase pumps for proper rotation prior to installation,
restrain the pump before applying power. Turn the power to the on
and off, and observe the pumps rotation. To change rotation, reverse
any two of the three hot leads to the pump. Code the wires for
reconnection later.