PT-100 Manual

© 2017 Sensata TechnologiesPage 76
Maintenance and Troubleshooting

FAULT LED
ON
High PV Input Fault - The PT controller turned off and stopped producing power
to the batteries because a very high PV voltage (>187 VDC) has been detected
on the PV input terminals (i.e., PV+ to PV-). This is usually caused during cold
weather if the PV array voltage is sized too high or too close to the maximum PT input
operating voltage. To prevent this fault and to keep the controller running, size the
PV array to ensure the PV input stays below 188 volts under any weather condition.
Note: The PT operating range is VBat+5 VDC to 187 VDC. Some installers will
size the array on purpose so that the Voc on a colder day may rise above 187
VDC, but never above the absolute max voltage (200 VDC + battery voltage or
240 VDC–whichever is lower). Most of the time if the battery needs to be charged
and there is no other issue with the PT controller, the PT controller will MPPT and
not let the voltage rise to the high turn off voltage level (e.g. >187 VDC).
Remedy: The fault will automatically clear and the PT controller will resume
operation once the voltage to the PV input terminals is less than 185 VDC.
CAUTION: The PT controller can be damaged if the PV voltage is more than
200 VDC above the battery voltage or 240 VDC maximum, whichever is less.
Info: The digital display alternates this fault code (F03) with the DC
voltage value determined on the PV input terminals.

FAULT LED
ON
High Battery Fault - The PT controller turned off due to high voltage (≥68 VDC)
detected on the battery input terminals (i.e., BAT+ to BAT-). This can be caused by
incorrectly connecting the PV array to the battery terminals, or the battery bank
is being charged by some external means and the voltage has exceeded 68 VDC.
Remedy: The fault will automatically clear and the controller will resume
operation once the voltage to the battery input terminals is <66.4 volts DC.
This fault can also be cleared manually by pressing the RESET pushbutton for
one second once the voltage falls below 68 VDC.
CAUTION: The PT controller can be damaged if the voltage to the battery
input terminals is above 68 VDC.
Info: The digital display alternates this fault code (F04) with the DC
voltage value determined on the battery input terminals.

FAULT LED
BLINKING
BTS Shorted Fault - The PT controller continues to run, but blinks the fault light to
indicate that it has detected a problem with the BTS, and temperature compensated
charging is no longer available.
Remedy: This can be caused by a shorted BTS cable or debris within the
BTS RJ11 terminal. Either remove and replace the BTS (and cable), or check
the BTS connector to ensure there are no shorted pins or debris inside.
Note: If caused by a faulty BTS, this fault will automatically clear once the
BTS is removed.

FAULT LED
ON
FET Overtemp Fault - The PT controller turned off because the internal FET’s
(Field Effect Transistors) have exceeded their safe temperature operating range
(≥85°C/185°F). Note: If this fault happens often, ensure the controller is not in a
hot area, has proper ventilation, and the cooling fans inside are working.
Remedy: This fault will automatically clear and the controller will resume
operation when the FET temperature has cooled down below 83°C/181°F.
This fault can also be cleared manually by pressing the RESET pushbutton for
one second when the FET temperature falls below 85°C/185°F.
Info: The digital display alternates this fault code (F06) with the FET
temperature.