GAC ESD5340 Manual - Página 9
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10
SYSTEm TROUBlEShOOTINg (CONTINUED)
InSTaBILITY
InSTaBILITY
SYmPTom
Fast Insta-
An irregularity of
bility
speed above 3Hz.
(Perceived as a
jitter)
Slow Periodic
An irregularity of
speed below 3Hz.
(Sometimes severe)
Slow Periodic
An irregularity of
(continued)
speed below 3Hz.
(Sometimes severe)
For slow instability use the table below to set the SlOW INSTABIlITY SeqUeNCe and for fast instability use the FAST INSTABIlITY
SEQUENCE. Start by setting the switches to reflect Sequence 1. If instability persists, adjust the switches to reflect Sequence 2.
Continue through each sequence until instability stops.
SW2 SWITcH SeTTInGS for InSTaBILITY
SlOW INSTABIlITY
SW2-1
SeqUeNCe
1
on
2
on
3
on
on
4
5
on
on
6
7
on
on
8
9
OFF
10
OFF
11
OFF
12
OFF
13
OFF
14
OFF
15
OFF
16
OFF
InSUffIcIenT maGneTIc SPeeD SIGnaL
The speed control unit will govern well with 1.0 V AC RMS speed sensor signal. A speed sensor signal of 3 V RMS or greater at
governed speed is recommended. A strong magnetic speed sensor signal will eliminate the possibility of missed or extra pulses. The
amplitude of the speed sensor signal can be raised by reducing the gap between the speed sensor tip and the engine ring gear. The
gap should not be any smaller than 0.020 in (0.45 mm). When the engine is stopped, back the speed sensor out by 3/4 turn after
touching the ring gear tooth to achieve a satisfactory air gap.
emI SUScePTIBILITY
The governor system can be adversely affected by large interfering signals that are conducted through the cabling or through direct
radiation into the control circuits. All GAC speed control sensors contain filters and shielding designed to protect the units sensitive
circuits from moderate external interfering sources.
If it is suspected that external fields, either those that are radiated or conducted, are or will affect the governor systems operation, it is
recommended to use shielded cable for all external connections. Be sure that only one end of the shields, including the speed sensor
shield, is connected to a single point on the case of the speed control unit. Mount the speed control to a grounded metal back plate
or place it in a sealed metal box.
If unsuccessful in solving instability, contact GAC for assistance.
[email protected] or 413-233-1888
1.
Set SW1 C1 to OFF (lead/lag) and/or set SW2 switches 1,2, and 3 to ON (DTC).
2.
If instability continues set SW1 C2 (Soft Coupling Filter) to ON.
3.
If instability continues turn off battery changers or other electrical equipment to see if the symptom
disappears.
1.
Set SW1 C1 (lead/lag) to ON.
2.
If instability continues set SW2 switches (DTC) to the ON/OFF positions in the sequential order de-
SW2 SWITCH SeTTINGS FOR INSTABIlITY
scribed in the
1.
If slow stability is unaffected by the explained procedure above, add a small amount of droop.
Additional Dead Time Control can be added by connecting a capacitor across the two posts below the
ACCel/DeCel adjustments. The positive side (+) of the cap is to be connected to e3. 20 MFD and
above should be used.
SW2-2
SW2-3
SW2-4
on
on
on
on
on
OFF
on
OFF
on
on
OFF
OFF
OFF
on
on
on
OFF
OFF
OFF
OFF
on
OFF
OFF
OFF
on
on
on
on
on
OFF
on
OFF
on
on
OFF
OFF
OFF
on
on
OFF
on
OFF
on
OFF
OFF
OFF
OFF
OFF
ProBaBLe caUSe of
aBnormaL reaDInG
FAST INSTABIlITY
SeqUeNCe
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
9
ESD5300 Speed Control Unit 09-2020-H
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table.
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