Description
9907-028 Digital governor system
9907-028 Digital governor system
Module Clips Drive controller servo motor
Contact: Mr. Lai
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Speed Range An internal switch selects one of the following speed ranges:
500 to 1500 Hz
1000 to 3000 Hz
2000 to 6000 Hz
4000 to 12000 Hz
Speed Sensing 1 to 30 Vac. Input Impedance is 1 k at 1 kHz
Externally Applied Speed Reference Proportional to 4–20 mA or 1–5 Vdc input. Speed reference is
proportional to applicable input signal.
SPM-A Synchronizer Input –5 to +5 Vdc for –3.3% to +3.3% or –1.5 to +1.5 Vdc for –1% to
+1% speed change. Impedance is 100 k.
Minimum Fuel Opening the external minimum fuel switch will send a minimum-fuel
signal to the actuator. The minimum-fuel switch is an optional
means for a normal shutdown. Not to be used for emergency
shutdown.
Droop Where droop is required, an external potentiometer is used to set
the desired percentage of droop. Use a 2 k potentiometer for up to
7.5% droop when 2/3 actuator travel is used for 0–100% load.
Leave droop potentiometer terminals open if only isochronous
operation is desired.
Failed Speed Signal Override Close the external contact to override the failed speed protective
circuit when required for start-up.
Weight About 1.1 kg (2.5 pounds). May vary slightly depending on model.
POWER SUPPLY
High Voltage Model 90 to 150 Vdc or 88 to 132 Vac
Low Voltage Model 20 to 40 Vdc
ADJUSTMENTS
Start Fuel Limit Sets actuator current between 25% and 100% of specified
maximum actuator current during start-up. Actuate the Start Fuel
Limit Override when placing a reverse acting system on line.
Level Sets speed set point demanded by minimum control signal input.
Range Sets speed reference demanded by maximum control signal input.
Low Limit Sets minimum speed reference that can be demanded by control
signal. May be used to set rated speed in the absence of a control
signal.
High Limit Sets maximum speed reference that can be demanded by control
signal. Prevents control signals in excess of normal from causing
overspeed.
Droop Provides 0 to 10% reduction in speed set point reference between
no load and full load. External potentiometer required.
Gain, Reset, and Actuator Compensation Sets dynamic response. Adjustable to accommodate diesel, gas, or
turbine engines.
CONTROL CHARACTERISTICS
Steady State Speed Band ±1/4 of 1% of rated speed
Load Sharing Within ±5% of rated load with speed settings matched and the
addition of a Generator Load Sensor
Operating Temperature –40 to +85 °C (–40 to +185 °F)
Storage Temperature –55 to +105 °C (–67 to +221 °F)
Maximum Ambient Humidity 95% at 38 °C (100 °F)
Vibration and Shock Tests Vibration tested at 4 Gs between 5 and 500 Hz. Shock tested at 60
Gs
Technical Manual 82020
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