Installation Guide

Troubleshooting
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, ARC FLASH, AND FIRE
This chapter includes tasks that must be performed only by qualified personnel equipped
with appropriate personal protective equipment and following safe electrical work practices.
Review the Safety Information on page 7 before proceeding.
Failure to follow these instructions will result in death or serious injury.
Issue Possible Cause Solution
Uneven output current
between multiple
charge controllers.
A. PV arrays are supplying different amounts
of current to each charge controller.
B. Charging set points are not all set the
same.
C. Excess voltage drop in wiring is causing
charge controllers to measure the battery
voltage differently and regulate accordingly.
D. Charge controllers are in constant voltage
(absorption) mode and therefore are limiting
their output current to maintain the present
battery voltage. In this situation, some charge
controllers will produce more output current
than others.
A. Check array output, but consider that this could
be a normal operating condition if the arrays are
located in different locations or point in different
directions.
B. Set charge controllers to the same settings.
C. Check wiring. Upgrading or shortening the wire
run might be required.
D. No need to intervene as this is a normal
operating condition.
The SCP LCD shows a
ground fault and the
charge controller has
stopped operating.
A ground fault has caused the ground fault
protection fuse to blow, or a normally
ungrounded array contains a ground fault.
See Replacing the Ground Fault Protection Fuse on
page 53 or Ground Faults in a Normally
Ungrounded Array on page 53.
The charge controller’s
Error/ Warning (red)
LED is on or flashing.
An active fault, error, or warning is present on
the charge controller.
See “Viewing Active Faults, Errors, and Warnings”
in the Conext MPPT 80 and MPPT 100 Owner's
Guide to determine which alarm is active on the
charge controller. The tables in this section provide
detailed information on why various alarms could
be occurring on the charge controller.
The charge controller’s
Error/ Warning (red)
LED is on, and the SCP
indicates a ground fault
(F56) for the charge
controller.
A ground fault has caused the ground fault
protection fuse to blow, or a normally
ungrounded array contains a ground fault.
See Replacing the Ground Fault Protection Fuse on
page 53 or Ground Faults in a Normally
Ungrounded Array on page 53.
Table 2Troubleshooting
Conext MPPT 80 and MPPT 100 Installation Guide Troubleshooting
51 This document is for use by qualified personnel 990-91319