Troubleshooting guide

Digital output signals can drive devices such as relays or indicator lamps. 24 VDC power must be

supplied from an external source. Each output has a maximum current capability of 500 mA. Maximum

voltage capability of these circuits is 40 VDC (see Section 11, Specifications, for more information).

Figure 5 – Sample Digital Output Connections

5.4 Check Wiring and Close Access Cover

Double-check all of your electrical connections. Pay attention to polarity of all inputs and outputs – both

low and high voltage. Additionally, insure that all terminals are clamping onto the bare conductor, not on

its insulation. Ensure that wires will not be trapped or pinched when front cover is replaced and secured.

Ensure that excess insulation is not removed from the wires, as this can lead to poor connections or faulty

operation.

Replace the main access cover and secure the 10 bolts.

Use a nut driver to tighten the retaining bolts evenly. Failure to do so may cause the cover to leak

and void the warranty.

5.5 Confirm Correct Incoming Power

WITHOUT PRIOR OPERATING KNOWLEDGE, IT IS IMPOSSIBLE TO TELL IF THE PUMP MOTOR

WILL RUN WHEN POWER IS APPLIED TO THE

MPC. YOU ARE RESPONSIBLE FOR TAKING THE

NECESSARY STEPS TO ENSURE THAT ALL ASPECTS OF SAFETY HAVE BEEN CONSIDERED

(E.G.,

ELECTRICAL

, HYDRAULIC, ETC.).

Turn on power at the mains or distribution panel. If the MPC's incoming power is connected correctly,

the backlighting on the MPC's display will illuminate (depending on lighting conditions, it may be

necessary to shade the display to confirm illumination). If the display is not illuminated, first check the

line voltage with a voltmeter. If the voltage is not correct, return to Section 5.3.2 – Installation: High

Voltage Connections. Otherwise, proceed with the next step.