Onan 200 DFP - Control Panel Interior

• HI ENG TEMP (red) indicates engine has shut down
because of critically high temperature.
• OVERSPEED (red) indicates engine has shut down
because of excessive speed.
• OVERCRANK (red) indicates the starter has been
locked out because of excessive cranking time.
• FAULT 1 (red) an undedicated fault. May be factory
programmed as a shutdown or non-shutdown, and as
a timed or non-timed (normally set for timed
shutdown).
® FAULT 2 (red) same features as Fault 1 (normally set
for timed shutdown).
• LO ENG TEMP (yellow) engine temperature is margi¬
nally low for starting. Indicates inoperative coolant
heater, (Lamp lights when engine water jacket
temperature is 70°F (21 °C) or lower. Since the lamp
goes out after the engine warms up there should be
no cause for alarm even during initial generator set
operation.)
• LO FUEL (yellow). Indicates fuel supply is marginally
low.
• SWITCH OFF (flashing red) indicates generator set is
riot in automatic start operation mode.
AC Panel
AC Voltmeter (Optional): Dual range instrument indicat¬
ing AC voltage Measurement range in use shown on
indicator light.
AC Ammeter (Optional): Dual range instrument indi¬
cates AC generator line current.
Wattmeter (Optional): Continuously gives reading of
the generator output in kilowatts.
Frequency Meter (Optional): Indicates generator output
frequency in hertz. It can be used to check engine speed
(each hertz equals 30 r/rnin).
Voltage Adjust (Optional): Rheostat providing approx¬
imately plus or minus five percent adjustment of the
rated output voltage.
Upper and Lower Scale Indicator Lamps (Optional):
Indicates which scale to use on the AC voltmeter and
ammeter
Phase Selector Switch (Optional): Selects phases of
generator output to be measured by AC voltmeter and
AC ammeter.
CONTROL PANEL INTERIOR
Generator AC Voltage Regulator
The solid-state regulator (VRAS-2) controls AC output
voltage from the generator at a predetermined level
regardless of load. Voltage regulation is plus or minus
two percent from no load to full load. Random voltage
variation is pius or minus one percent for constant
loads.
Engine Control Module
Electronic and relay components of the engine monitor¬
ing circuit are on a circuit board assembly. Sensor
inputs (Figure 3) are connected by the wiring harness to
plug connectors on the board. The control module pro¬
vides the following functions of unit protection.
• Overcrank - Limits engine cranking to 75 seconds. If
engine fails to start, the module lights a fault lamp
and opens the cranking circuit. The cycle cranking
option allows three 15-second cranking cycles with
two 15-second rest periods on the 12-lamp control.
• Overspeed - Shuts down the engine immediately if
overspeed occurs and lights a fault lamp. The sen¬
sor switch is mounted in 'he end bell on the genera¬
tor shaft. It is factory adjusted to shut down 60 hertz
units at 2100 ± 90 r/rnin, 50 hertz units at 1850 ± 50
r/min.
• Low Oil Pressure - Shuts down the engine imme¬
diately if oil pressure drops below 14 psi (97 kPa)
and lights a fault lamp. The fault is time-delayed
about 10 seconds following starter disconnect and
inhibited during cranking. The delay allows oil pres¬
sure to rise to normal before the electronic control
module monitors this system.
A pre-low oil pressure sensor and lamp (used with
optional 12-lamp system) provides an alarm that oil
pressure is marginally low, 20 psi (137 kPa) or less.
The cause should be found and corrected as soon
as possible.
• High Engine Temperature - shuts down the engine
immediately if coolant temperature rises above
215°F (102°C) and lights a fault lamp. The fault is
time-delayed about 10 seconds following starter
disconnect and inhibited during cranking. This
delay allows coolant in a hot engine time to circulate
and return the water jacket to normal before the
electronic control module monitors this system.
A pre-high engine temperature sensor and lamp
used with optional 12-lamp systems, provides an
alarm that engine temperature is marginally high,
205°F (97°C). The cause should be found and cor¬
rected as soon as possible.
Field Breaker: Provides generator exciter and regulator
protection from overheating in the event of certain fail¬
ure modes of generator, exciter and voltage regulator.
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