background image

6

Governors America Corp. © 2020 Copyright All Rights Reserved

ESD5550-5570 Series Speed Control Unit

   

9-2020-E

   

PIB1003

The engine’s exhaust smoke at start-up can be minimized by completing the following adjustments:

1.  Switch 1 (SW1) controls the Lead Circuit. The normal position is ON. Move the switch to the OFF 

position if there is fast instability in the system. 

2.  Switch 2 (SW2) controls a circuit designed to eliminate fast erratic governor behavior, caused by very 

soft or worn couplings in the drive train between the engine and generator. The normal position is 

OFF. 

3.  Move to the ON position if fast erratic engine behavior due to a soft coupling is experienced

  LeaD cIrcUIT anD SofT coUPLInG

Droop is typically used for the paralleling engine driven generators. When in droop operation, the engine speed will decrease as engine 

load increases.  The percentage of droop is based on the actuator current change from no engine load to full load. 
1.  Place the optional external selector switch in the DROOP position. DROOP is increased by clockwise rotation of the DROOP adjust-

ment control. 

2.  After the droop level has been adjusted, the rated engine speed setting may need to be reset. Check the engines speed and adjust 

that speed setting accordingly. 

Though a wide range of droop is available with the internal control, droop level requirements of 10% are unusual. If droop levels experi-

enced are higher or lower than those required, contact GAC for assistance.

DrooP oPeraTIon

5

ADJUSTMENTS (CONTINUED)

 The governed speed set point is increased by a CW rotation of the SPEED adjustment control (25 turn pot.). Remote speed adjustment 

can be obtained with an optional 5K Speed Trim Control. See section 4, Wiring diagram.

Once the engine is at operating speed and at no load, the following governor performance adjustment can be made.

ParameTer

ProceDUre

GAIN

1.  Rotate the GAIN adjustment clockwise until instability develops.

2.  Gradually move the adjustment counterclockwise until stability returns.

3.  Move the adjustment one division further counterclockwise to ensure stable performance (270° potentiometer). 

4.  If instability persists, adjust the next parameter.

STABILITy

1.  Rotate the STABILITy adjustment clockwise until instability develops.

2.  Gradually move the adjustment counterclockwise until stability returns.

3.  Move the adjustment one division further counterclockwise to ensure stable performance (270° potentiometer). 

Normally, adjustments made at no load achieve satisfactory performance. If further performance improvements are required, 

refer to section 7, SySTEM TROuBLESHOOTING. 

noTe

aDJUSTInG STaBILITY

WIDe ranGe remoTe varIaBLe SPeeD oPeraTIon

Remote variable speed can be obtained with the an external potentiometer. A single remote speed adjustment potentiometer can be used 

to adjust the engine speed continuously over a specific speed range. 

1.  Select the desired speed range and corresponding potentiometer value as detailed in section 4, ADDING A POTENTIOMETER. If the 

exact range cannot be found, select the next higher range potentiometer. 

2.  Connect the speed range potentiometer as shown in WIRING Diagram. 

3. 

An additional fixed resistor may be placed across the potentiometer to obtain the exact desired range. 

4.  To maintain engine stability at the minimum speed setting, a small amount of droop can be added by turning DROOP adjustment CW. 

5.  At the maximum speed setting the governor performance will be near isochronous, regardless of the droop adjustment setting.

Summary of Contents for ESD-5550 Series

Page 1: ...er DNV GL Bureau Vertas PHYSICAL Dimension See Section 3 Installation Weight 1 8 lbf 0 82 kgf Mounting Any position vertical preferred The ESD5550 5570 series speed control unit is an all electronic device de signed to control engine speed with fast and precise response to transient load changes This closed loop control when connected to a proportional electric actuator and supplied with a magneti...

Page 2: ...ed Control Unit 9 2020 E PIB1003 3 Installation Mount in a cabinet engine enclosure or sealed metal box Vertical orientation allows fluids to drain in moist environments Dimensions Avoid extreme heat in mm Take into account the following preferences when mounting the speed controller ...

Page 3: ...1003 4 Wiring An overspeed shutdown device independent of the governor system must be provided to prevent loss of engine control which may cause personal injury or equipment damage Do not rely exclusively on the governor system to prevent over speed A secondary shutoff device such as a fuel solenoid must be used ...

Page 4: ...sure no other part of the shield comes in contact with engine ground otherwise stray speed signals may be introduced into the speed control unit With the engine stopped adjust the gap between the magnetic speed sensor and the ring gear teeth The gap should not be any smaller than 0 020 in 0 45 mm Usually backing out the speed sensor 1 4 to 1 2 turn after touching the ring gear teeth will achieve a...

Page 5: ...g The overspeed function is now set to approximately 10 above the requested speed 1 2 ON STABILITY GAIN SPEED OVERSPEED ADJUSTING OVERSPEED ADJUSTMENT SWITCH POTENTIOMETER SWITCH FACTORY SETTING NOTES SPEED 25 turn 1470 Hz 50 Hz w min trim GAIN 270 turn 50 Middle position STABILITY 270 turn 50 Middle position DROOP 270 turn 0 CCW IDLE 270 turn 1075 75 Hz STARTING FUEL RAMP 270 turn 100 CW Maximum ...

Page 6: ...obtained with an optional 5K Speed Trim Control See section 4 Wiring diagram Once the engine is at operating speed and at no load the following governor performance adjustment can be made PARAMETER PROCEDURE GAIN 1 Rotate the GAIN adjustment clockwise until instability develops 2 Gradually move the adjustment counterclockwise until stability returns 3 Move the adjustment one division further count...

Page 7: ...t governs well with 0 5 volts RMS speed sensor signal A speed sensor signal of 3 volts RMS or greater at governed speed is recommended Measurement of the signal is made at Terminals C and D 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 02 in 0 5 mm When the engine is stopped ...

Page 8: ... governor system After the actuator goes to full fuel disconnect the speed sensor at Terminal C D If the actuator is still at full fuel speed then the speed control unit is defective 2 Manually hold the engine at the desired running speed Measure the DC voltage between Terminals A F on the speed control unit 1 If the voltage reading is 1 0 to 2 0 V DC SPEED adjustment is set above desired speed De...

Reviews: