Diesel Gen-set Operation Instructions
81
rectifying plates. Corresponding lead must be disconnected before reading.
5.3.2 Voltage Imbalance of Primary Output Terminal
Voltage imbalance shows that main stator winding or main cable connected to circuit
breaker may have problems. Note: during excitation, fault of stator winding and main
cable may significantly increase the load of engine. Disconnect the main cable and
leads of winding, U1-U2, (U5-U6),V1-V2, (V5-V6), W1-W2, (W5-W6), to separate
the windings.
Measure phase-to-phase and phase-to-ground insulation resistance.
Imbalanced or incorrect winding resistance and/or too low insulation resistance to
ground indicates that stator coil must be replaced.
1.
Insufficient output power of Gen-set
Serial
number
Cause
Elimination method
1
Combustion of combustible mixture is
affected in cold state of diesel engine.
Normal phenomenon. The diesel engine
can only be loaded in hot state.
2
Load power is more than rated power of
Gen-set.
Reduce load or select Gen-set of higher
rated power.
3
Air is thin due to too high temperature or
altitude.
Consult salesmen about correcting
power of Gen-set.
4
Air leakage of air intake system
Find out the fault point to repair or
replace.
5
Intake manifold is blocked.
Clean intake manifold, and replace it if
necessary.
6
Fault of air filter
Clean air filter, and replace it if
necessary.
7
Exhaust pipe is blocked.
Clear carbon deposit in the exhaust
manifold, and replace it if necessary.
8 Silencer
is
blocked.
Clear carbon deposit in the silencer, and
replace it if necessary.
9
The temperature of diesel engine is too
high, which reduces aeration rate of
cylinder and makes combustion
incomplete.
Inspect operation of cooling system and
repair.
10
Viscosity of machine is too high, which
increases running resistance of diesel
engine and power consumption.
Clean the lubrication system, and
replace the machine oil with that of
appropriate trademark as required in
instructions.
11
Resistance of crankshaft dipped in
Discharge surplus machine oil to make
