15
OPM-115
REV A
TROUBLESHOOTING TABLE
NOTE: Before doing any trouble shooting, check the digital display on
the DSE 7310 MKII. Normally, it will tell why the unit has failed. This
will shorten your trouble shooting time and in many cases, prevent the
replacement of parts that may not be defective.
Problem
Possible Causes
Unit will not crank when power fails
Digital genset not in AUTO
Transfer control switch not in
AUTOMATIC position
Incorrect wiring between ATS and genset
Defective control relay in ATS
Fuse(s) blown in the DSE 7310 MKII
Defective DSE 7310 MKII
Loose or dirty battery terminals
Defective starter
Defective start solenoid
Low/dead battery
Engine won’t crank
Low/dead battery
Blown DC fuses
Defective DSE 7310 MKII
Defective key switch
Loose or dirty battery terminals
Defective starter
Defective start solenoid
Locked up engine genset
Defective engine harness
Improper battery voltage to start solenoid,
fuel pump, or fuel solenoid
Engine cranks but will not start
Improper fuel delivery to the unit
Fuel supply shut off
Fuel tank empty
Air in the fuel system
Engine fuel solenoid has not opened
Defective fuel pump
Defective fuel solenoid
Defective engine harness
Improper battery voltage to fuel pump or
fuel solenoid
Engine starts, then stops and alarm
light comes on
Engine oil pressure is low
Engine has high water temperature
Engine has overspeed
Engine has gone into overcrank
No output from AC generator
Loss of speed signal
Loss of run signal
Engine will not come up to speed
after it starts
Insufficient fuel volume getting to the unit
1. Too small of fuel line
2. Fuel racks not open properly
Governor is defective
AC short in generator components
ATS will not transfer to Emergency
Supply (generator)
No AC generator output
Defective ATS control board. See ATS
manual
Circuit breaker open or defective
ATS will not re-transfer to normal
power
Proper power line not available at line
terminals in ATS panel
Defective ATS control board. See ATS
manual
No AC output from generator
Defective diode
Defective voltage regulator
Defective rotor
Defective stator
Defective exciter rotor
Defective exciter stator
AC short in the output leads
Defective/open generator output breaker
Wiring error
VOLTAGE REGULATOR WIRING
AS440 Automatic Voltage Regulator
The following is a list of connections on the AVR. These have been
factory set and other than voltage adjustment, should never be
changed.
VOLTS
To adjust generator output voltage.
Clockwise to increase voltage.
STABILITY
To prevent voltage hunting.
Clockwise to increase the dampening effect.
STANDARD CONNECTIONS
Terminals 1 & 2 will be fitted with a shorting link if no hand trimmer is
required.
Terminals La & Lb are linked only for special low voltage applications.
UFRO - Under Frequency Roll Off
Terminal S1 is connected to the C.T., S2 on the AVR.
DROOP - Normally preset in the works to give 5% voltage droop at full
load zero power factor.
Terminal A1 is connected to the AVR 0 Volts. Positive on A2 increases
excitation, negative on A2 decreases excitation.
TRIM - allows the user to adjust the sensitivity of the input.
LED Indicator Light - indicates over excitation condition or under speed
running.
MX341 Automatic Voltage Regulator
Under normal conditions only two adjustments are made to the voltage
regulator.
VOLTS
To adjust generator output voltage.
Clockwise to increase voltage.
STABILITY
To prevent voltage hunting.
Clockwise to increase the
dampening effect.
STANDARD CONNECTIONS
(Top Row, Right to Left)
1 -2 Are linked together.
2 - Lead #9 from AC terminal block.*
3 - Lead #8 from AC terminal block.*
X - F1 from generator exciter
XX - F2 from generator exciter
P4, P3, P2 all come from the PMG
* voltage between these to leads must be between 190 & 264.
(Center tapped on 480 Volt)
LED
Indicator
Light
FITTING AND OPERATING
©2006
3
TD_AS440 AVR_03.09_04_GB
SUMMARY OF AVR CONTROLS
CONTROL
FUNCTION
DIRECTION
VOLTS
TO ADJUST GENERATOR OUTPUT VOLTAGE
CLOCKWISE INCREASES OUTPUT VOLTAGE
STABILITY
TO PREVENT VOLTAGE HUNTING
CLOCKWISE INCREASE THE DAMPING EFFECT
STAB SWITCH TO OPTIMISE TRANSIENT PERFORMANCE
SEE TABLE ABOVE
UFRO
TO SET THE UFRO KNEE POINT
CLOCKWISE REDUCES THE KNEE POINT FREQUENCY
DROOP
TO SET THE GENERATOR DROOP TO 5% AT 0PF
CLOCKWISE INCREASES THE DROOP
VTRIM
TO OPTIMISE ANALOGUE INPUT SENSITIVITY
CLOCKWISE INCREASES THE GAIN OR SENSITIVITY
EXC TRIP
TO SET OVER EXCITATION TRIP CUT OFF LEVEL
CLOCKWISE INCREASES THE CUT OFF LEVEL
ADJUSTMENT OF AVR CONTROLS
VOLTAGE ADJUSTMENT
The generator output voltage is set at the factory, but
can be altered by careful adjustment of the VOLTS
control on the AVR board, or by the external hand
trimmer if fitted. If major adjustment is necessary or
you lose stability, follow the ‘
VOLTAGE SETUP
PROCEDURE
’.
Terminals 1 and 2 on the AVR will be fitted with a shorting
link if no hand trimmer is required. Terminals La and Lb are
linked only for special low voltage applications.
WARNING!
Do not increase the voltage above the rated
generator voltage. If in doubt, refer to the rating plate
mounted on the generator case.
WARNING!
Do not ground any of the hand trimmer
terminals as these could be above earth potential. Failure
to observe this could cause equipment damage.
WARNING!
If a replacement AVR has been fitted or re-setting of the
VOLTS adjustment is required, turn the VOLTS control
fully anti-clockwise before running generator.
VOLTAGE SETUP PROCEDURE
For major adjustments and replacing the AVR.
Read and understand this procedure before
attempting to follow it.
1. Before running generator, turn the VOLTS control
fully anti-clockwise.
2. Turn remote volts trimmer (if fitted) to midway
position.
3. Turn STABILITY control to midway position.
4. Connect a suitable voltmeter (0-300V ac) across
line to neutral of the generator.
5. Start generator set, and run on no load at nominal
frequency e.g. 50-53Hz or 60-63Hz.
6. If the red Light Emitting Diode (LED) is illuminated,
refer to the Under Frequency Roll Off (UFRO)
adjustment.
7. Carefully turn VOLTS control clockwise until rated
voltage is reached.
8. If instability is present at rated voltage, refer to
stability adjustment, then re-adjust voltage if
necessary.
9. Voltage adjustment is now completed.
REFER TO GENERATOR WIRING DIAGRAM
FOR CONNECTION DETAILS
F2 F1 7 8
8 Z2
S1
S2
A1
A2
AS440
Trim
Droop
Volts
Stability
Selection
UFRO
Frequency
Selection
Indicator LED
Stab
60Hz
50Hz
1
2
3
Lb
La
ABCD
Stability Selection Table
No.
Power range Response
B-D
< 100kW
Slow
A-C < 100kW
Fast
B-C
100-550kW
Fast
A-B
> 550kW
Fast
Hand trimmer terminals. Remove
link before fitting hand trimmer.
Link must be fitted when hand
trimmer is not required.
Exc
Trip
8 and Z2 – linked for
normal operation
23
5040-00
60708-166
VOLTAGE REGULATOR WIRING
K1 K2 P2 P3
P4 XX X 3
2 2 1
A1
A2
S1
S2
1
2
3
4
5
6
7
8
C B A
3 2 1
MX341
Trim
Droop
Volts
Stability
Selection
UFRO
Frequency
Selection
Indicator
LED
Stability
K1-K2
Power isolation link
(normally fitted)
REFER
DIP
EXC.
TRIP
> 550kW
< 90kW
90-550kW
4P60H
z
4P50H
z
No link 6P50Hz
6P60H
z
Sensing
links
standard
positions
Under normal conditions only two adjustments
are made to the voltage regulator.
VOLTS - To adjust generator output voltage.
Clockwise to increase voltage.
STABILITY - To prevent voltage hunting.
Clockwise to increase the
dampaning effect.
STANDARD CONNECTIONS
(Top Row, Right to Left)
1 -2 Are linked together.
2 - Lead #9 from AC terminal block.*
3 - Lead #8 from AC terminal block.*
X - F1 from generator excitor
XX - F2 from generator excitor
P4, P3, P2 all come from the PMG
* voltage between these to leads
must be between 190 & 264.
(Center tapped on 480 Volt)
SX460 Automatic Voltage Regulator
The following is a list of connections on the AVR. These
have been factory set and other that volt adjustment should
never have to be changed.
1. Generator AC sensing connection (6, 7, 8)
Field voltage DC (F1 & F2)
2. Voltage Adjustment
3. External voltage adjustment rheostat
No external rheostat link 1 & 2
With external rheostat, 1 & 2 unlinked
Connect external rheostat leads to 1 & 2.
4. AVR input selection.
High Voltage 208/240/277 no link between 3 & 4
Low voltage 120 volt link 3 & 4.
5. Under Frequency Roll Off adjustment
6. Under Frequency Roll Off indication LED
7. Frequency selection:
50 Hz operation Link C to 50
60 Hz operation Link C to 60
8. Stability control
MX341 Automatic Voltage Regulator
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