Troubleshooting guide

8
5.3.2 Power Wiring Information
 Verify the correct supply voltage (115VAC or 230VAC) with the nameplate affixed to your MPC.
Ensure that your supply voltage matches the MPC configuration.
 Wires should be routed within the enclosure in a manner that maintains separation between high
voltage and low voltage conductors.
 Incoming power wiring should adhere to all applicable local and national electrical codes and
regulations.
 A circuit breaker or fuse must be provided as noted below.
 Upon initial application of AC power, a current inrush will occur to charge the DC bus
capacitors. This is normal operation, and breakers and other circuit protection devices should be
sized accordingly.
The MPC requires one connection to an external power source. It uses this same connection to power it’s
own supply as well as the AC pump motor. You must take all of these loads into consideration when
sizing the branch circuit (see Table 1). A circuit breaker or disconnect switch with fuses must be wired in
series with terminals L1 and L2/N in accordance with all applicable local and national electrical codes
and regulations. The circuit breaker or disconnect switch shall be located in close proximity to the MPC
controller installation, and must be marked or labeled to identify it as the power disconnect for the MPC.
Power Requirements
Recommended Minimum Wiring and Circuit Breaker
120 VAC Operation 240 VAC Operation
Actual
Draw
Circuit
Breaker
Wire
Size
Wire
Size
Actual
Draw
Circuit
Breaker
Wire
Size
Wire
Size
MPC and 0.25 Hp motor
6.9 A 10 A 14 AWG 1.5 mm
2
3.5 A 10 A 14 AWG 1.5 mm
2
MPC and 0.33 Hp motor
6.9 A 10 A 14 AWG 2.5 mm
2
3.5 A 10 A 14 AWG 1.5 mm
2
MPC and 0.5 Hp motor
9.3 A 15 A 14 AWG 2.5 mm
2
5.1 A 10 A 14 AWG 1.5 mm
2
MPC and 0.75 Hp motor
16.7 A 25 A 12 AWG 4.0 mm
2
9.3 A 15 A 14 AWG 2.5 mm
2
MPC and 1.0 Hp motor
16.7 A 25 A 12 AWG 4.0 mm
2
9.3 A 15 A 14 AWG 2.5 mm
2
MPC and 1.5 Hp motor
24.1 A 35 A 10 AWG 4.0 mm
2
12.1 A 20 A 14 AWG 2.5 mm
2
Table 1 – Sizing Branch Circuits
The MPC controller is provided with a ¾” NPT inlet for incoming AC power wiring at the rear (pump
gearbox end) of the enclosure. Utilize the appropriate conduit fittings to route and seal the supply wires
into the MPC enclosure.
These wires are secured to the terminal strip at the right-hand end of the AC drive as per Table 2.
Remove approximately 0.20 – 0.25” of insulation from the end of each conductor. Loosen the terminal
strip screw, and insert the stripped wire end fully into the terminal. Tighten the screw to secure the
conductor, making certain that the terminal grips the wire, not the insulation. Ensure that all wiring
meets applicable local and national codes and requirements.