Using a PT Controller: Troubleshooting
Page 148
©
2017 Sensata Technologies
•
High Bat VDC-PT
– High voltage (
≥
68 VDC) has been detected on the battery input terminals
(i.e., BAT+ to BAT-).
Remedy:
Check the voltage on the battery terminals. High voltage can be caused by an
incorrect connection of the PV array to the battery terminals, or the battery bank being
charged by an external means and the voltage is >68 VDC (including ripple voltage).
Note:
The fault automatically clears and the unit resumes operation once the voltage
to the battery input terminals is
≤
66.4 VDC. Manually clear the fault by pressing the PT
controller’s RESET pushbutton for one second when 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.
•
High PV VDC-PT
– A very high PV voltage (>187 VDC) has been detected on the PV terminals
(i.e., PV+ to PV-).
Remedy:
Check if the sizing of the PV array voltage is too high or too close to the
maximum PT input operating voltage during cold weather periods. To prevent this fault
and keep the controller running, size the PV array to ensure the PV input voltage stays
below 187 VDC under any weather condition.
Note:
The fault automatically clears and the unit resumes operation once the voltage to
the PV input terminals is less than 187 VDC.
CAUTION:
The PT controller can be damaged if the voltage to the PV input terminals is
more than 200 VDC above the battery voltage or greater than the 240 VDC maximum,
whichever is less.
•
Ind Overtemp-PT
– The PT controller turned off because the internal inductors have exceeded
their safe operating temperature (
≥
270
°
F/132
°
C).
Remedy:
If this fault frequently occurs, ensure the controller is not in a hot area, has
proper ventilation, and the cooling fans inside are working.
Note:
This fault automatically clears and the unit resumes operation when the IND
temperature has cooled down below 261°F/127°C. Manually clear by pressing the PT’s
RESET pushbutton for one second once the FET temperature falls below 270°F/132°C.
•
Int Hardware-PT
– The redundant hardware protection circuit that monitors the internal
temperature has exceeded a safe operating limit.
Remedy:
When a fault condition occurs, the PT controller shuts down to protect itself.
Press and hold the PT’s RESET pushbutton for 10 seconds to turn the controller on and
to verify the fault has cleared. If the fault remains, the controller will require repair.
•
Int NTC-PT
– The internal NTC (Negative Temperature Coefficient) temperature sensor
detected a large, unexpected temp change.
Remedy:
When this fault condition occurs, the PT controller shuts down to help protect
itself. Press and hold the PT’s RESET pushbutton for 10 seconds to turn the controller on
and to verify the fault has cleared. If the fault remains, the controller will require repair.
•
Int Overload-PT
– The current to an internal sensor has exceeded the PT’s protection limits.
Remedy:
When this fault condition occurs, the PT controller shuts down to help protect
itself. Press the PT’s RESET pushbutton for one second to turn the controller on and to
verify the fault has cleared. If the fault remains, the inverter will require repair.
•
Int Phase-PT
– The internal phases is faulty or the phase signals are not in sync with each
other.
Remedy:
When this fault condition occurs, the controller shuts down to help protect
itself. Press the PT’s RESET pushbutton for one second to turn the controller on and to
verify the fault has cleared. If the fault remains, the controller requires repair.
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