CONTROL
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) 21: 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.
Voltage Regulator, Begin Spec E: Solid state unit,
consisting of printed circuit board VR21; an SCR
bridge CR21, with a commutating reactor L21 are
located in the control panel as part of the voltage
regulator system. AC output from generator is
con-
trolled at predetermined level regardless of
load;
regulation is plus or minus 2% from no load to full
load,
at 0.8 PF.
Engine Monitor Printed circuit plug-in modules
provide the following functions:
1.
A 75 second cranking period.
2.
Approximately a 12.5 second time delay for oil
pressure buildup.
3. An external alarm contact to light afault 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).
c. Low oil pressure 14 psi (96.53 kN/m
2
).
d.
High engine temperature 215° F (102° C).
High Engine Temperature Cutoff will shut
down engine In an overheat condition only If
coolant level is sufficiently high to physically contact shutdown
switch.
Loss of coolant will allow engine to overheat without
protection of shutdown device, thereby causing severe damage to
the engine. It Is therefore imperative that adequate engine coolant
levels be maintained, to ensure operational integrity of cooling
system and engine coolant overtieat shutdown protection.
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.
OPTIONAL
MODULES
Cycle Cranker: Plug-in module replaces standard
cranking circuit. Automatically provides a 15-second
cranktime and a 10-second rest time forthree 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.
10
To Next Page
Loading...
Need help?
General
