Control Panel Interior; Optional Modules; Terminal Board; Voltage Regulator - Onan 50.0DDB-15R Series Operator's Manual And Parts Catalog

C O N T R O L PANEL INTERIOR
The only equipments discussed in this section will be
those which the operator may have reason to adjust or
inspect for service.
Terminal Board (TB) 2 1 : Connection of wire W12 to
terminals H3, H4, H5, and H6 is made at this point, to
change reference voltage when reconnecting
generator for different voltages. Refer to Figure 14.
Voltage Regulator: Solid state unit, consisting of
VR21, CR21 and L21. Controls AC output from
generator at predetermined level regardless of load..
Regulation plus or minus 2% from no load to full load,
0.8 P.F.
c. Low oil pressure (14 psi).
d. High engine temperature (215°F).
On standard control panels, all four alarms are wired into one
common fault lamp; on units with five fault lamps, four have
shutdown alarms, the fifth (low engine temperature) lights a fault
lamp only. Refer to Table 2.
Standard Cranking Module: Limits engine cranking
time to 75 seconds. If engine fails to start after 75
seconds the engine monitor lights a fault lamp and
opens the cranking circuit.
Engine Monitor: Printed circuit plug-in modules
provide the following functions:
1. A 75 second cranking period.
2. Approximately a 12-1/2 second time delay for oil
pressure buildup.
3. An external alarm contact to light a fault lamp and
shut down the set for alarm conditions such as:
a. Overcrank (failed to start after cranking 75
seconds).
b. Overspeed (engine speed reaches 2100 rpm).
OPTIONAL MODULES
Cycle Cranker: Plug-in module replaces standard
cranking circuit. Automatically provides a 15-second
crank time and a 10-second rest time for three ON and
two OFF cycles in 65 seconds. If engine fails to start,
after 75-seconds the engine monitor lights a fault
lamp and opens the cranking circuit.
Pre-Alarm: Gives advance warning for low oil
pressure or high engine temperature. Requires two
sensors each for engine temperature and oil pressure.