8/12/2019 SLM100

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SLM100Smoke Limiting Module

For Turbocharged Diesel Engines

ENGINEGOVERNINGSYSTEM

Governors America Corp. 720 Silver Street Agawam, MA 01001phone: 413.786.5600 fax: 413.789.7736

www.governors-america.com info@governors-america.com

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INTRODUCTION

The SLM100 is a smoke limiting device. When used in con- junction with a modied GAC speed control unit, like the ES-D5524E, can substantially reduce the smoke being emittedfrom the diesel engine. Gensets using a turbocharged dieselengine as a drive produce an unwanted smoky environmentat start-up and during sudden load increases, especiallywhen a boost fuel-limiting device is not used. This is mostnoticeable on Cummins engines operating with an EFC gov-ernor. Under normal operation, when the load on a gensetis suddenly increased, the engine speed will decrease andthe speed controller will recognize this and counter with aninstant increase in fuel. By the time the turbocharger unitreacts to the need for more air intake, the controller hasalready compensated for the load. This results in an overabundance of fuel in the engine which in turn generates afew seconds of unwanted smoke each time the load chang-es. Turbocharger units are typically slower to react to thischange compared to the speed controller.

DESCRIPTION

The SLM100 has a built-in pressure sensor that is directlyconnected to the turbocharger unit. The SLM100 receivesan output signal from this pressure sensor and generates asignal directly proportional to the internal pressure of the tur-bocharger. The SLM100 calculates a response to this signaland passes it on to the modied GAC speed control, which inturn will adjust the output current to the actuator. This actionwill reduce the fuel going to the engine as long as the tur-bocharger unit has not reached its high-pressure threshold.This results in a substantial reduction in smoky emissionsduring load transients and an increase in fuel economy.

INSTALLATION

The SLM100 module is hard-potted and therefore ruggedenough to be placed in a control cabinet or engine mount-ed enclosure with other control equipment. Extreme heatshould be avoided. After mounting the SLM100, preferablynear the ESD5524E, the following connections are made:See the Wiring Diagram. Connect Terminal 1 of the SLM100to Terminal P (10V DC output) of the ESD5524E. ConnectTerminal 2 of the SLM100 to Terminal G (Ground) of theESD5524E. Connect Terminal 3 of the SLM100 to TerminalH of the ESD5524E. The tubing connection for the pressuresensor must be located on the turbocharger unit.

ADJUSTMENTS

Preset the SLM100 as follows:

Zero Adj Connect a DC voltmeter to the SLM100 so thatthe positive probe is attached to TP1 and the negative probeis attached to Terminal 2 (GND). Turn the Zero Adjust potCW or CCW to get as close as you can to 0 V DC. This valueshould not be greater than 75mV.

Current Limit With the engine running at normal operatingspeed and no load, turn the Current Limit pot slowly CCW tothe point where you notice a decrease in speed, then turn itslightly CW.

Ramp The position of the Ramp pot is a trade-off betweenfuel economy and the engines ability to quickly react to fre-quently changing loads. As an example, in a crane applica-tion the load can be changed from no load to some level ofthe load several times within the span of a second. In a caselike this it is better to have Ramp at 80-100% CW. If normalchanges of load are less frequent, the position of Ramp canbe adjusted to 40-50% CW or less.

Gain Adjusted to minimize smoke.

Temp Cal This calibration adjustment is going to dependon several factors. If the unit is placed in a high ambient tem-perature environment, the value and polarity of the outputvoltage may or may not change. If there are no changes,Temp Cal should be set to 50% of the maximum rotationof the pot. If the changes are positive, adjust the Temp Calproportionally CW. If negative, then CCW adjustment will beneeded.

OVERNOR

MERICA

ORCA

G

ISO 9001

CERTIFIE

8/12/2019 SLM100

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PIB4112 A

This document is subject to change without notice.Caution: None of GAC products are ight certied controls including this item.

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WIRING DIAGRAM

SPECIFICATIONS

PERFORMANCE

Maximum Pressure Input........................................................... 60psiressure Sensor Response Time (10% to 90%).....100uSec

Voltage Build Up.......1% Maximumamp Adjustment Range...............................................70ms to 1.2 secower Supply.........................10V DC acquired from the ESD5524E

ENVIRONMENTAL

Ambient Operating Temperature Range... -40F to + 180F (-40C to + 85C)elative Humidity..................Up to 100%

All Surface Finishes..Fungus Proof and Corrosion Resistant

RELIABILITY

Vibration..........................................................................5G @ 20-500 HzTesting...........................Functionally Tested

PHYSICAL

Dimensions.....146mm x 140mm x 26mmWeight..............1 lbMounting .....Any Position, Vertically Preferred