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Global Power Technologies START-UP AND OPERATION
302842 Rev0 | Sentinel Page 31 of 61
CAUTION!
Do not exceed 3.3 in.H
2
O of fuel pressure adjustment. If OCV is still too low after
3.3 in.H
2
O adjustment, let the Sentinel TEG run at the final adjustment setting and
check the OCV again at the next maintenance visit.
4.3.4 CUSTOMER OUTPUT VOLTAGE ADJUSTMENT
The customer output voltage can be adjusted using the potentiometer on the main electronics board.
To adjust the customer output voltage:
1. Ensure that the SW200 switch, is set to the “RUN” position.
2. Disconnect the customer load by disconnecting the positive wire at the [ + TEG OUT – ] terminal.
3. Connect a voltmeter to the [ + TEG OUT – ] terminals.
4. Confirm that the SW300 switch is set to the T.COMP.OFF position.
5. Use a small flathead screwdriver to turn the VOLTAGE ADJUST potentiometer. The voltage level
on the voltmeter should change as the potentiometer is turned.
6. Set the output voltage based on your site requirements.
7. When finished, remove the voltmeter connection, and reconnect the customer load wire.
4.3.5 ENABLING OUTPUT VOLTAGE TEMPERATURE COMPENSATION
The Sentinel TEG is equipped with a temperature compensation feature which can be used when
charging lead-acid station batteries with the TEG. This feature can be enabled by setting the SW300
switch to the T.COMP.ON position. When enabled, the Sentinel TEG’s output voltage will be scaled
based on the current ambient temperature.
The voltage scaling is tuned for typical lead-acid station batteries and is 20 mV/°C for 12V Models or
40 mV/°C for 24V Models.
The Sentinel TEG is shipped from the factory with the SW300 switch set to T.COMP.OFF. Before
switching the temperature compensation on, confirm that the customer output voltage has been
properly calibrated. The VOLTAGE ADJUST potentiometer must be calibrated before turning on the
T.COMP switch to ensure accurate temperature compensation.
CAUTION!
Ensure precise calibration of the Voltage Adjust potentiometer
12V Model (SENTINEL10-12) — 14.3 V
24V Model (SENTINEL10-24) — 28.6 V
Set the output voltage precisely to the voltage listed above based on the Sentinel model, then set the
SW300 switch to the T.COMP.ON position.
WARNING!
Calibrate the potentiometer before setting the SW300 switch to T.COMP.ON.
Turning on temperature compensation without first calibrating the potentiometer
can lead to overcharged or undercharged station batteries.