EXERCISE
PERIOD
Generator sets on continuous standby service are
required to be operative at essential loads from a cold
start in a short period of time in the event of a power
outage.
This imposes severe conditions on the engine. Fric-
tion of drypiston rings upon dry cylinderwallscauses
scuffing and rapid wearing. These can be relieved by
exercising thei set at least once a week for a minimum
time of 30-minutes per exercise period. Preferably,
run the set under at least 50 percent load to allow the
engine to reach normal operating temperature. This
will keep engine parts lubricated, maintain fuel prime,
prevent electrical relay contacts from oxidizing and
insure easy emergency starts. Onan automatic
transfer switches contain an optional exercise switch
which,
by pre-selection, wMl start, determine run
period and shut down a set on a weekly frequency.
For example, the switch can be set for time of start,
length of run, A.M: or P.M. and day of week.
After each exercise period, top off fuel.tank, check
engine for leaks and unit for general condition.
Locate cause of leaks (if any) and correct.
2.
Run set until thoroughly warm; generator under
at least 50%
load.
3. Shut down engine and drain oil base while still
warm.
Refill and attach a warning tag indicating
viscosity of oil used.
4.
Service air cleaner.
5. Clean throttle and governor linkage and protect
by wrapping with a clean cloth.
6. Plug exhaust outlets to prevent entrance of
moisture, bugs, dirt, etc.
7: Clean off dirt and dry entire unit. Coat parts likely
to rust with a light coat of grease or oil.
8. Disconnect battery and follow standard battery
storage procedure. Apply a film of non-
conductive grease
(e.g.,
vaseline) to battery cable
lugs.
9. Fill fuel tank to prevent condensation contamina-
tion.
10.
Provide a suitable cover for the entire unit.
NO
LOAD
OPERATION
Periods of no load operation should be held to-a
minimum:
If it is necessary to keep theengine running
for long periods of time when no electric output is
required,
best engine performance will be obtained
by connecting a."dummy" electrical
load.
Such a load
could consist of heater elements, etc.
OUT-OF-SERVICE
PROTECTION
Generator sets removed from service for extended
periods of time should be protected from rust and
corrosion.
The natural lubrication qualities of ASTM
No.
2 Diesel fuel should protect a diesel engine for at
least 30-days when unit is not in service. Tb protect a
unit that will be out of service over 30 days, Onan
recommends the following procedure:
1.
Check coo.'ant, top up
recommended anti-freeze.
if necessary using
RETURNING
A
UNIT
TO
SERVICE
1.
Remove cover and all protective wrapping.
Remove plug from exhaust outlet.
2.
Check warning tag on oil base and verify that oil
viscosity is still correct for existing ambient
temperature.
3. Clean and check battery. Measure specific gravity
(1.260 at 77°
F
[25° C]) and verify level to be at split
ring.
If specific gravity is low, charge until correct
value is obtained. If level is low, add distilled water
and charge until specific gravity is correct. DO
NOT OVERCHARGE.
WARNING
Do not smoke while servicing batteries.
Explosive gases are emitted from
batteries in operation. Ignition of these gases can cause
severe personal injury.
4.
Check coolant level, adjust if necessary.
5. Connect batteries.
6. Verify that no loads are connected to generator.
7. Start engine.
8. After start, apply load to at least 50 percent of
rated capacity.
9. Check all gauges to be reading correctly. Unit is
ready for service.
26
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