DKG-255 User Manual Firmware V-1.0
DKG-255
DIGITAL SPEED
CONTROLLER
The DKG-255 is a microprocessor controlled digital
speed control unit designed to control the engine
speed with fast and accurate response to load
changes.
The DKG-255 connects to a forward acting
proportional electric actuator and a magnetic speed
sensor. It is also capable of picking-up the speed
signal from the alternator voltage, removing the need
for a MPU unit. It controls a wide variety of engines
in constant speed (isochronous) or droop modes.
The DKG-255 offers programmable parameters to
adjust IDLE and RATED speed settings. The IDLE
speed mode is selected with an external switch.
The automatic PID speed regulation function controls
the dynamic performance of the unit and allows
stable operation with most engine types.
The unit is able to adjust automatically its PID
settings, simplifying the programming process and
improving the dynamic response quality.
An external speed trim potentiometer may be
connected to the unit to adjust the engine speed
from a remote location.
The auxiliary speed adjustment input allows voltage
controlled speed trimming for synchronizing and load
sharing applications.
If an adequate speed signal is not supplied to the
unit, the speed signal monitoring circuit will detect
this and shut-off the actuator output in order to
prevent any damage.
The unit is capable to deliver actuator currents as
high as 10 Amps. However, the output current
limiting circuit will protect the unit against output
short circuit or overload.
Protection against reverse battery connection and
transient voltages are provided.
• Automatic PID Setup functionality
• Microprocessor controlled
• 12 and 24V operation
• Capable of governing various engines
• Forward acting actuator output
• Fast and accurate response
• Starting fuel adjustment
• Speed ramp adjustment
• Adjustable rated and idle speeds
• Isochronous and droop operation
• Gain and stability adjustments
• External speed adjustment capability
• Synchronizing and load sharing input
• Switch mode output circuit
• 10 Amps continuous current output
• Speed sensor failure detection
• Battery reverse voltage protection
• Output short circuit protection
• Rugged design
• Enamel protected electronic circuit
• Small dimensions (130x110x27mm)
• Low cost
FEATURES
DESCRIPTION
DKG-255 User Manual Firmware V-1.0
QUERRIES
ABOUT THIS DOCUMENT
COPYRIGHT NOTICE
Any unauthorized use or copying of the contents or any part of this document is prohibited.
This applies in particular to trademarks, model denominations, part numbers and drawings.
This document describes minimum requirements and necessary steps for the successful installation of
the DKG-255 unit.
Follow carefully advices given in the document. These are often good practices for the installation of
digital speed control unit which reduce future issues.
For all technical queries please contact Datakom at below e-mail address:
technical.support@datakom.com.tr
If additional information to this manual is required, please contact the manufacturer directly at below email address:
technical.support@datakom.com.tr
Please provide following information in order to get answers to any question:
- Device model name (see the back panel of the unit),
- Complete serial number (see the back panel of the unit),
- Firmware version (read from the display screen),
- Measuring-circuit voltage and power supply voltage,
- Precise description of the query.
DKG-255 User Manual Firmware V-1.0
REVISION
DATE
AUTHOR
DESCRIPTION
01
10.04.2019
MH
First edition, firmware version 1.0
CAUTION: Potential risk of injury or death.
WARNING: Potential risk of malfunction or material damage.
ATTENTION: Useful hints for the understanding of device operation.
REVISION HISTORY
TERMINOLOGY
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DKG-255 User Manual Firmware V-1.0
Electrical equipment should be installed only by qualified
specialist. No responsibility is assured by the manufacturer or
any of its subsidiaries for any consequences resulting from the
non-compliance to these instructions.
Check the unit for cracks and damages due to transportation.
Do not install damaged equipment.
Do not open the unit. There are no serviceable parts inside.
A fuse must be connected to the power supply input, in close
proximity of the unit.
Fuses must be of fast type with a maximum rating of 16A.
Disconnect all power before working on equipment.
When the unit is connected to the network do not touch
terminals.
Any electrical parameter applied to the device must be in the
range specified in the user manual. Although the unit is
designed with a wide safety margin, over-range parameters may
reduce lifetime, alter operational precision or even damage the
unit.
Do not try to clean the device with solvent or the like. Only
clean with a dump cloth.
Verify correct terminal connections before applying power.
SAFETY NOTICE
Failure to follow below instructions
will result in death or serious injury
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DKG-255 User Manual Firmware V-1.0
TABLE OF CONTENTS
1. INSTALLATION INSTRUCTIONS
1.1 INTRODUCTION TO THE CONTROL UNIT
1.2 MOUNTING THE UNIT
1.3 WIRING THE UNIT
2. TERMINAL DESCRIPTIONS
3. TECHNICAL SPECIFICATIONS
4. DESCRIPTION OF CONTROLS
4.1. FRONT PANEL FUNCTIONALITY
4.2. PUSHBUTTON FUNCTIONS
4.3. LED DISPLAY ORGANIZATION
5. PROTECTION AND ALARMS
6. PROGRAMMING
7. PROGRAM PARAMETER LIST
8. OPERATION OF THE UNIT
8.1. AUTO PID SETUP
9. OTHER FEATURES
9.1. ISOCHRONOUS AND DROOP OPERATION
9.2. IDLE SPEED SELECTION
9.3. EXTERNAL SPEED ADJUSTMENT
9.4. SPEED ADJUSTMENT FOR AUTOMATIC SYNCHRONIZATION
9.5. STARTING FUEL ADJUSTMENT
9.6. SPEED RAMPING ADJUSTMENT
9.7. OVERSPEED ALARM ADJUSTMENT
9.8. SAVING AND RESTORING THE CONFIGURATION
9.9. FIRMWARE UPDATE
10. CONNECTION DIAGRAM
11. DECLARATION OF CONFORMITY
12. MAINTENANCE
13. DISPOSAL OF THE UNIT
14. ROHS COMPLIANCE
15. TROUBLESHOOTING GUIDE
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DKG-255 User Manual Firmware V-1.0
1.2 Mounting the Unit
1.1 Introduction to the Control Unit
1. INSTALLATION INSTRUCTIONS
The DKG-255 is a microprocessor controlled governor control unit designed to control the engine speed
with fast and accurate response to load changes.
The DKG-255 connects to a forward acting proportional electric actuator and a magnetic speed sensor.
It is able to control a wide variety of engines in constant speed (isochronous) or droop modes.
Thanks to its PID control system, the optimal response specific to each engine is performed.
The unit is capable of delivering actuator currents as high as 10 Amps. However, the output circuit is
protected against short circuit and overload.
Protection against reverse battery connection and transient voltages are provided.
The unit is suitable for both 12 and 24V operation.
The unit is designed to be mounted inside a control cabinet. A vertical mounting position is preferred so
that the heat is dissipated with vertical airflow.
Extreme heat may affect the performance of the unit and should be avoided.
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DKG-255 User Manual Firmware V-1.0
Do not rely exclusively on the governor controller-actuator
system for engine overspeed protection. An additional
overspeed shutdown means controlling the fuel solenoid
should be installed on the engine.
THE UNIT IS NOT FUSED. Use external fuse for battery
positive (terminal C) Install the fuse as nearly as possible to
the unit.
The fuse rating should be 16 Amps.
1.3 Wiring the Unit
Cables of section 1.5mm² or higher should be used for battery and actuator connections (terminals A-BC-D). The section needs to be increased with long cable lengths.
The signal connections on terminals E-F-G-H-J should be twisted or shielded for the entire length of the
cable. The shield should be grounded at one end only. The other end of the shield should be left
unconnected in order to avoid current flowing through it.
The gap between the magnetic speed sensor and the ring gear teeth should not be less than 0.50mm
(0.020”). The usual way of adjusting the gap is backing up the sensor ¾ turn after touching the ring gear
teeth.
The magnetic speed sensor voltage should be at least 1.5 VAC RMS during cranking.
If the alternator voltage is used for speed detection, an AC voltage of 300V or below can be directly
connected to terminals E-F.
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DKG-255 User Manual Firmware V-1.0
Term
Function
Technical data
Description
A
Actuator -
Output, 10A max
These outputs supply energy to the
electric actuator. The output voltage will
increase in order to supply more fuel to the
engine.
An overload/short circuit protection is
provided.
B
Actuator +
C
Battery +
Input, 12/24VDC
Power supply connection. Use cables of
adequate section for the actuator.
D
Battery -
E
Magnetic pick-up -
Input, 1.5 - 300VAC
Connect the magnetic pickup terminals to
these inputs.
The input voltage cannot be less than
1.5VAC. A signal of at least 3 VAC-RMS is
recommended.
The cable should be either twisted or
shielded.
If the alternator voltage is used for speed
detection, an AC voltage of 300V or
below can be directly connected to these
terminals.
F
Magnetic pick-up +
G
Speed Trim
Input
Connect an external speed trim
potentiometer to adjust the engine speed.
H
J
K
Droop
Input
Connecting this terminal to battery
negative will cause DROOP operation.
The DROOP range is adjusted through
DROOP program parameter.
L
Idle
Input
Connecting this terminal to battery
negative will switch to IDLE SPEED
operation. The IDLE SPEED is adjusted
with the IDLE programmable parameter.
M
External speed adjust
Input, 0-10VDC
The external speed adjustment voltage
should be connected to this input. The
cable should be either twisted or shielded.
N
CAN L
This feature will be available soon.
P
CAN H
2. TERMINAL DESCRIPTIONS
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