Diagram 1. Again, readjust the GAIN and STABILITY for
optimum control. Interference from powerful electrical sig-
nals can also be the cause. Turn off the battery chargers or
other electrical equipment to see if the system instability
disappears.
Slow instability can have many causes. Adjustment of the
GAIN and STABILITY usually cures most situations by
matching the speed control unit dynamics. If this is unsuc-
cessful, the dead time compensation can be modified. Add
a capacitor from posts E2 to E3 (negative on E2). Post loca-
tions are illustrated in Diagram 1. Start with 10 mfds, and
increase until instability is eliminated. The control system
can also be optimized for best performance by following this
procedure.
If slow instability is unaffected by this procedure, evaluate
the fuel system and engine performance. Check the fuel
system linkage for binding, high friction, or poor linkage. Be
sure to check linkage during engine operation. Also look at
the engine fuel system. Irregularities with carburetion or fuel
injection systems can change engine power with a constant
throttle setting. This can result in speed deviations beyond
the control of the governor system. Adding a small amount
of droop (Jumper K-L) can help stabilize the system for trou-
bleshooting.
NON-PERIODIC instability should respond to the GAIN con-
trol. If increasing the gain reduces the instability, then the
problem is probably with the engine. Higher gain allows the
governor to respond faster and correct for disturbance. Look for
engine misfirings, an erratic fuel system, or load changes on the
engine generator set voltage regulator. If the throttle is slightly
erratic, but performance is fast, move switch C1 to the “OFF”
position. This will tend to steady the system.
If unsuccessful in solving instability, contact GAC for assis-
tance.
Specifications
PERFORMANCE
Isochronous Operation/Steady State Stability ...................±0.25% or better
Speed Range/Governor……………………………....1K-7.5K Hz continuous
Speed Drift with Temperature................................................
±1% Maximum
Idle Adjust CW...................................................................
60% of set speed
Idle Adjust CCW.............................................................
Less than 1200 Hz.
Crank Termination Adjustment Range.....................................
300-2200 Hz.
Droop Range....................................................................
1 - 5% regulation*
Droop Adj. Max. (K-L Jumpered) ..........
400 Hz., ± 75 Hz. per 1.0 A change
Droop Adj. Min. (K-L Jumpered)................
15 Hz., ± 6 Hz. per 1.0 A change
Speed Trim Range ........................................................................
± 200 Hz.
Remote Variable Speed Range .................
500 - 7.5 Hz. or any part thereof
Speed Switch Adjustment Range........................................
1000-10000 Hz.
Terminal Sensitivity
J ...............................
100 Hz., ± 15 Hz / Volt @ 5.0 K Impedance
L ................................
735 Hz., ± 60 Hz / Volt @ 65 K Impedance
N.............................
148 Hz., ± 10 Hz / Volt @ 1 Meg Impedance
P.....................................................
10 VDC Supply @ 20 ma Max
Speed Switch Adjustment Range........................................
1000-10000 Hz.
INPUT POWER
Supply...........................................................
12 or 24 VDC Battery Systems
(Transient and Reverse Voltage Protected)**
Polarity......................................................
Negative Ground (Case Isolated)
Power Consumption........................
50 mA continuous plus actuator current
Actuator Current Range @ 77°F (25°C) - (Inductive Load)............................
..................................................
Min. 2.5Amps.. Max. 10Amps continuous***
Speed Sensor Signal.......................................................
0.5-120 Volts RMS
Speed Switch Relay Contacts (N.O. and N.C.)
...............................10 Amps
ENVIRONMENTAL
Ambient Operating Temperature Range.......-40° to +180°F (-40° to +85°C)
Relative Humidity .........................................................................
up to 95%
All Surface Finishes.........................
Fungus Proof and Corrosion Resistant
RoHS Regulation...........................................................................
Compliant
RELIABILITY
Vibration...........................................................................
1G @ 20 -100 Hz.
Testing .................................................................
100% Functionally Tested
PHYSICAL
Dimensions .........................................................
See Outline (DIAGRAM 1)
Weight ...........................................................................
1.8 lbs. (820 grams)
Mounting---------------------------------------------
Any Position, Vertical Preferred
COMPLIANCE / STANDARDS
Agency…...........................................................................CE Requirements
*Droop is based on a speed sensor frequency of 4000 Hz. and an actuator current change of 1 amp from no
load to full load. Applications with higher speed sensor signals will experience less percent-age of droop.
Applications with more actuator currant change will experience higher percentages of droop. See droop
description for specific details on operation of droop ranges. When used with the ADC100 actuator the droop
percentage will he less due to the actuators low current consumption.
**Protected against reverse voltage by a series diode. A I5 amp fuse must be installed in the posi-
tive battery lead.
***Protected against short circuit to actuator (shuts off current to actuator), unit automatically turns
back on when short is removed.
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