Gentherm Global Power Technologies 9-2
P-5050
62553 rev.8
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
:
a)
Check V
set
, see Power Output Evaluation Section 7, and record.
b)
Compare measured voltage with required V
set
for present ambient temperature and
act as follows:
I)
If measured voltage is more than 0.1 V above required V
set
:
The fuel pressure must be reduced. Proceed with Routine Service, per topic
below. Remember to adjust the fuel pressure during restart or before leaving
the site. See Adjustment section.
Caution:
Do not continue operating the TEG with measured V
set
exceeding
that required V
set
, for present ambient temperature, otherwise
overheating may cause irreparable damage to the power unit.
II)
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, per topic below.
III)
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. In the log, check if the TEG was left operating at the correct Vset during
the last service visit. Remember that Vset changes with ambient conditions. If
the TEG was not left operating at the correct Vset during the last visit, deter-
mine 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 possible causes:
i)
Change in Fuel Pressure
Refer back 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 pres-
sure to the last entry. If this returns the measured voltage to within 0.1
V of required V
set
proceed with Routine Service, Section 9.1.3.
Note: A dirty fuel filter may cause a drop in fuel pressure. A plugged fuel ori-
fice will change fuel flow without a change in fuel pressure.
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