Voltage Adjust Potentiometer; Alarm Horn; Dc Panel Fuse; User Programmable Inputs - Generac Power Systems E Operating Manual

VOLTAGE ADJUST POTENTIOMETER

This potentiometer permits the operator to "fine
adjust" the generator's AC output voltage on units
rated below 400 kW. Adjustment range is plus or
minus five percent. Turn the knob clockwise to
increase voltage, counterclockwise to decrease voltage.

ALARM HORN

This horn sounds an audible warning when an alarm
condition exists. See the "Alarms" section for further
information.

DC PANEL FUSE

This 15-amp fuse protects the panel components.
This fuse is not to be confused with the control mod-
ule internal fuse discussed in "Checking/Replacing
the E Panel Control Module Internal Fuse."
EMERGENCY STOP SWITCH
When pressed, this switch will automatically shut
down the entire generator set. The operator must pull
the switch out to its original position to reset it and
allow for generator operation.
CHECKING/REPLACING THE E PANEL
CONTROL MODULE INTERNAL FUSE
Typically, the main indication of fuse failure is the
absence of any illuminated front panel LEDs (even
with the key in the OFF position, the "Power" LED
will be illuminated) and no text visible on the module
display. It should be noted however, that these condi-
tions can exist if either:
a. The generator start battery is dead (less than five
volts) or disconnected.
b. The main panel fuse (15 amp) is blown.
c. The battery supply wires (#13 and #0) to the
panel control module are open circuit (discon-
nected).
d. The "Power" connector (CON4) is disconnected
from the rear of the control module.
e. The generator start battery connections have been
reversed. Reversal of the battery connections
WILL blow the internal fuse and is the most like-
ly reason for its failure.
Before removing or disconnecting the E panel control
module, check that none of the above conditions (a-
e) exist.
If you are satisfied that the problem lies with the
control module:
1. Disconnect the generator start battery.
2. Unplug all four wire harnesses from the back of
the control module.
3. Loosen, then detach, the two retaining clips secur-
ing the control module and remove the module.
Section 1 — General Information
E Option Control Panels
4. Using a multimeter (e.g., Fluke 87) set to the diode
range, measure between pins 1 (BAT+) and 2 (BAT-
) of connector CON4 on the module.
• With the positive meter lead connected to pin
2 and the negative lead to pin 1, the meter
should read between 0.4 and 0.6 volts, which
indicates that the internal fuse is OK.
• Reversing the meter leads would give a slowly
increasing voltage reading on the meter, which
also indicates a good fuse.
• An open circuit fuse will give an open circuit
meter reading (.OL on Fluke 87).
If the meter reads open circuit:
5. Remove the four phillips head screws retaining the
rear cover of the control module.
3. Open the back of the control module.
4. Locate the internal printed-circuit board mounted
fuse, which is behind and to the left of CON4.
5. Remove the white plastic cover from the fuse hold-
er and remove the fuse.
6. If the fuse has blown, replace the fuse (part
#0A5705), reassemble the control module, and
reinstall the control module and its connections.
7. Reconnect the generator start battery and check if
the control module now functions.
If the fuse blows again, or was not blown when the
module was opened, or the module still does not
function, the E panel control module must be
replaced.

USER PROGRAMMABLE INPUTS

The E panel has eight (8) user programmable inputs.
These inputs can be used for annunciation, pre-
alarm, or shutdown alarms. Four of the inputs,
Battery Charge Fail, Gen Power, Line Power, and
Programmable Input 4 are set up to annunciate on
the control panel display and at the optional 20 Light
Remote Annunciator (Programmable Input 4 will
light the unlabeled "spare" LED). These four inputs
can be used for other connections if a remote annun-
ciator is not used. The other four inputs, if utilized,
will annunciate at the control panel only.
The user programmable input connection points are
located inside the E option control panel on a 12-
position strip labeled TB3 (refer to Figures 1.7 and
1.8 on page 12.). The first four terminals are labeled
"prog input gnd". These are the common ground con-
nection points for the user supplied switch devices to
be used for the programmable annunciation.
These ground terminals are for user programma-
ble input use only. The are not to be used for
grounding any other circuits.
Generac
NOTE:
® Power Systems, Inc. 11