28142 Rev 15 TROUBLESHOOTING
Gentherm Global Power Technologies Page 73
If the calculated internal resistance is too high, the power unit may not be able to provide
rated power to the load and should be replaced. If the calculated internal resistance is within
acceptable limits (under 1.1 Ω), an internal short may be present in the power unit.
Check for an Internal Short
Follow these steps to check for an internal short in the power unit:
Start the TEG.
Move the jumper clip to the SETUP position, between terminals 2 and 3 of TB-1.
Free-up terminals 2 (+) and 4 (-) by removing all wires from these terminals except
the white/red power unit lead connected to terminal 2, the white/black power unit
lead connected to terminal 4, and the white/black precision load lead connected to
terminal 4.
Connect a voltmeter to terminals 2 (+) and 4 (-).
Remove the jumper clip from the terminal block, and complete remaining steps within
one minute.
WARNING!
The following steps put the power unit in an open
circuit condition. Do not allow
to exceed 29 V, otherwise the power unit could be
permanently damaged.
CAUTION!
The following steps may cause sparking. If an internal
short is present, the jumper wire
steps may arc to the chassis.
Connect a jumper wire from terminal 4 to the TEG chassis and watch the voltmeter
reading. Then remove the jumper wire. Any fluctuation in voltage may indicate an
internal short within the power unit.
Connect a jumper wire from terminal 2 to the TEG chassis and watch the voltmeter
reading. Then remove the jumper wire. Any fluctuation in voltage may indicate an
internal short within the power unit.
Reinstall the jumper clip to the SETUP position, between terminals 2 and 3 of TB-1.
If an internal short is confirmed with no other equipment connected, the power unit is
damaged and will need replacing. If no internal short is found and the TEG appears to be
fully functional, check that the customer load is functioning correctly and is grounded
properly.
For further information or assistance, please contact the Customer Service Department at
Gentherm Global Power Technologies (GPT).
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