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Section 3 Controller
3.4 Voltage Adjustments
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
are in place.
Moving parts.
WARNING
Short circuits.
Hazardous voltage/current can cause
severe injury or death.
Short circuits can cause bodily injury
and/or equipment damage
.
Do not contact electrical
connections with tools or jewelry while making adjustments or
repairs. Remove all jewelry before servicing the equipment.
The controller’s adjustment mode allows adjustment of
the output voltage, if necessary.
Have adjustments
performed by a Lennox dealer or service technician.
Note:
A
digital
voltmeter
is
required
for
these
adjustments.
Use a voltmeter to check the output voltage. If the output
voltage is not within specifications, use the controller to
adjust the output voltage while the generator set is
running. The flowcharts in Figure 3-6 and Figure 3-7
outline the adjustment procedures.
Note:
Be sure to save your settings before exiting the
configuration mode.
Voltage changes are lost if they are not saved before the
generator set shuts down. The generator set continues
to run with the new settings until it shuts down but then
reverts to the previous settings at the next startup if the
changes have not been saved.
Pressing the Select button when SAVE is displayed
returns to the first parameter, voltage adjust (1P).
Note:
Refer to the flowcharts in Figure 3-6 and
Figure 3-7
during
the
voltage
adjustment
procedure.
Voltage Adjustment Procedure
1. With the generator set off, connect a digital
multimeter to the output leads or an electrical outlet
on the load side of the generator set. Set the meter
to measure AC voltage.
2. Start the generator set by moving the generator set
master switch to the RUN position.
3. Use the controller to adjust the voltage (parameter
1P) until the output voltage reaches the desired
value. See Figure 3-5 for the approximate change
in voltage per step in parameter 1P. See Figure 3-6
for adjustment instructions.
Measured
Voltage, VAC
Voltage Change per Step, VAC
Coarse Adjust
Fine Adjust
85--132
5
0.5
180--251
7
0.7
Figure 3-5
Voltage Adjustment (approximate)
4. Adjust the voltage stability (gain, parameter 2P) to
minimize
light
flicker.
See
Figure 3-6
for
adjustment instructions.
5. Readjust the voltage, if necessary.
6. Save the controller settings as described in
Figure 3-7.
7. Stop the generator set.
