MAAP Ground Fault Troubleshooting Guide Rev C.wpd Page 2 of 7
b. Small Flat Blade Screw Drive
c. Extra small Flat Blade Screw Drive
Preliminary Step: eliminate real shorts to earth ground.
1. Remove ac power (do not remove or replace F2 fuse under power), then remove
battery power (F4 fuse) from the panel. (The fuse is located in the top left hand
corner of the M Panel power supply board).
NOTE: Leave the field wiring conductors connected to the M Panel terminals.
2. Measure the resistance of each field wiring conductor on the panel to earth ground.
There must be greater than 500K Ohms from earth ground to any conductor. If
there is greater than 500K Ohms from earth ground to each of the conductors go to
Part One: Troubleshooting the Main Panel.
a. If there is only one field wiring conductor shorted go to step e of this section. If
there is more than one shorted field wiring conductor continue to the next step.
b. If there is less than 500K Ohms from earth ground to more than one conductor,
remove the field wiring to those terminals on the M Panel. Measure the
resistance from earth ground to the M Panel terminals associated to those
conductors. If there is less than 500K Ohms on any panel terminal, without field
wires, go to step f of this section.
c. Measure the resistance from earth ground to one of the conductors. If there is
greater than 500K Ohms select another conductor and repeat this step c. When
all shorts are removed go to step h.
d. Measure the resistance from earth ground to one of the conductors. If there is
less than 500K Ohms go to step g.
e. If there is less than 500K Ohms from earth ground to one conductor, remove the
field wiring to that terminal on the M Panel. Measure the resistance from earth
ground to the M Panel terminal. If there is greater than 500K Ohms go to step g
of this section.
f. If there is less than 500K Ohms from earth ground to the M Panel terminal,
remove all field wiring and measure resistance again. If there is less than 500K
Ohms contact Product Support at Monaco Enterprises for assistance.
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