DIY Manual

56 | P a g e 10-543-1 REV A
DIY Manual
Classic Will Not Turn On
1. Check Classic-to-battery circuit breaker.
2. Check for reverse polarity of battery positive and negative connections to the Classic.
3. Battery voltage needs to be 10V or higher for the Classic to power up. If less than 10V,
charge the battery bank using an external source of power.
Classic Stuck Sending Data
1. Check the MNGP firmware (FW) version. The MNGP’s firmware must “match” the
Classic’s firmware (i.e., 2133 MNGP matches 2126 Classic). Call MidNite’s Tech Support
for matching firmware versions.
2. If you have multiple Classics, did you accidently switch front panels amongst the
Classics? If so, you may have introduced mis-matched FW versions.
3. You may have a bad processor or weak solder joints in the Classic. To test the
processor:
a. Disconnect MNGP cable from Classic
b. Power down Classic for 30 seconds.
c. Power up Classic without MNGP connected.
d. Does the Classic POST (Power On Self-Test – lights illuminate, fans turn on)?
i. Yes – Bad firmware.
ii. No – Bad processor.
Ground Fault
Ground Fault means one of the current-carrying conductors (positive or negative) is in contact
with earth ground. The Classic has a built-in ground fault protection (GFP) circuit that detects
current flowing from ground to the battery negative through the Classic.
If a ground fault is detected, the Classic will cease power production and alarm. The GF condition
must be fixed and the Classic power-cycled off then on to clear the alarm.
To test the Classic’s GFP feature – Connect a 5A circuit breaker between Battery + and earth
ground. Turning this on simulates a GF and will trip the Classic.
Arc Fault
An arc fault is a short which produces an electrical spark (arc). An arc fault may occur on the PV
source circuit or even on the battery side of the Classic.
To test the Classic’s AF feature – In the combiner box, loosen one of the PV strings at the busbar,
and slowly remove it to make an arc. The Classic will report an arc fault and cease making power.
To reinstall – turn off that string’s PV circuit breaker; reattach the PV wire and torque as needed;
power cycle the Classic off then on.