MAINTENANCE
Gentherm Global Power Technologi
es
Page 50
9.1.2
Evaluate V
set
This procedure describes how to evaluate V
set
and determine what further servicing could be
needed. Follow these steps to evaluate V
set
:
4.
Check V
set
, see Power Output Evaluation and record.
5.
Compare measured voltage with required V
set
for present ambient temperature and
act as follows:
a)
If measured voltage is more than 0.1 V above required V
set
:
The fuel pressure must be reduced. Proceed with Routine Service, Section 9.1.3.
Remember to adjust the fuel pressure during restart or before leaving the site.
See Adjustment Section 8.
CAUTION!
Do not continue operating the TEG with measured V
set
exceeding that required V
set
, for present ambient
temperature, other- wise overheating may cause
irreparable damage to the power unit.
b)
If measured voltage is within 0.1 V of required V
set
:
The TEG is functioning well and requires only a routine service. Proceed with
Routine Service.
c)
If measured voltage is more than 0.1 V below required V
set
:
The cause must be determined. Refer to the last entry in the TEG Performance
Log. From the log, check if the TEG was left operating at the correct V
set
during
the last service visit. Remember that V
set
changes with ambient conditions. If the
TEG was not left operating at the correct V
set
during the last visit, determine the
reason for this. If the TEG was left operating at the correct V
set
during the last
visit and is now not, consider the following plausible causes:
Change in Fuel Pressure
Refer to the last entry in the log and determine if the fuel pressure has changed.
If the fuel pressure has changed, re-adjust the fuel pressure to the last entry.
If this returns the measured voltage to within 0.1 V of required V
set
proceed with
Routine Service.
NOTE:
A dirty fuel filter may cause a drop-in fuel pressure. A plugged fuel orifice will
change fuel flow without a change in fuel pressure.
Change in Air Flow
Check for obstructions at the cooling fins and the air filter stabilizer. Adjust the
air shutter, see Adjustment section. If this returns the measured voltage to
within 0.1 V of required V
set
proceed with Routine Service.
