GKD 1H Series User manual

USER MANUAL
M1000003 V1.3 - 11/2021

M1000003 V1.3 - 11/2021
www.gkdtechnologies.com 2

www.gkdtechnologies.com M1000003 V1.3 - 11/2021 3
CONTENTS
Page
SERIES 1-H INTRODUCTION 4
SERIES 1-H INDICATORS AND CONTROLS 5
SETTING UP THE SERIES 1-H CONTROL UNIT 6
SETTING THE HEIGHT LIMIT 6
PRACTICAL OPERATION OF SERIES 1-H SYSTEM 8
FAULT CONDITION INDICATION 10

M1000003 V1.3 - 11/2021
www.gkdtechnologies.com 4
SERIES 1-H INTRODUCTION
The GKD 1-H Height Limiting Indicator is designed to be fitted to plant and machinery with an
adjustable height boom to warn the operator that the equipment is approaching, or has reached a
pre-determined maximum height limit. The 1-H also gives an electrical output signal when the limit is
reached which can be used to control the operation of the machine.
Principles of Operation
The Series 1-H control unit is fitted in the cab of a machine, in clear view of the operator. An electronic
Angle Sensor is fitted to the variable angle boom of the machine and wired into the Series 1-H control unit.
The machine is set initially with the boom set as near to Horizontal position as practical and the
control unit taught that “Horizontal” position. The machine is then set to the “Maximum height”, the
maximum boom angle, for example when it might be approaching an overhead power line. The control
unit is then taught that maximum height value. When the machine is approaching, or has reached the
maximum height a series of LEDs and a sounder on the Series 1-H control unit warn the operator they
are approaching the limit. When the limit is reached a relay within the Series 1-H control unit switches o,
sending a signal to the equipment if required.
The “Maximum Height” can easily be reset to dierent heights under key switch control to allow for
dierent operating conditions.

www.gkdtechnologies.com M1000003 V1.3 - 11/2021 5
SERIES 1-H INDICATORS AND CONTROLS
The indicators on the Series 1-H display consist of five coloured LED lamps, which operate as follows:
Fault Lights up red when there is a fault with the system or configuration
! Lights up red when the machine reaches 95% of it’s permitted maximum load
•Lights up amber when the machine reaches 75% of it’s maximum load
•Lights up green when the machine is under 75% of it’s maximum load
On Lights up green at all times whilst the unit is powered
Key Switch
System OFF in Inactive Mode
System On in Height Limit Active Mode
System in Set-up in Set Limits Mode
Indicators in Active Mode
See detailed notes in section below
Set/Test Button
Set - in Set Limit mode
Test - in Active Mode

M1000003 V1.3 - 11/2021
www.gkdtechnologies.com 6
SETTING UP THE SERIES 1-H CONTROL UNIT
Initial switch on
Set the key switch to Active Mode and apply system power.
At power up all 5 LEDs come on and the Internal Sounder bleeps as a self test. The LEDs then go o
in turn.
At switch on if the machine is well within the Height Limit the Green “ON” LED and Green level
indicator LED will come on.
Horizontal Position Setting
The Horizontal Position is usually set once, when the 1-H system is first installed. See the 1-H
Installation Manual for details of how the to set the Horizontal Position.
SETTING THE HEIGHT LIMIT
The Height Limit can be set at any time to suit the conditions under which the machinery is to be used
on that occasion. The Height Limit is normally set under key switch control, by an authorized operator.
WARNING: THE HEIGHT LIMIT MUST BE SET TO THE LOWEST LEVEL OF THE OVERHEAD
OBSTRUCTION OVER THE WHOLE WORKING AREA!

www.gkdtechnologies.com M1000003 V1.3 - 11/2021 7
• Set the Key switch to Set Limit. The red Fault
LED will light if no limit is set. (In Set Limit &
Inactive modes, the control relay is On to give
free boom movement).
• Set machine to new maximum height limit
position. (Min. 15 degrees above Horizontal).
The Height Limit must be set with the
machine in the ‘worst case’. i.e. equipment at
full reach (for excavators) or extending boom
fully extended (for teletruks and machines
with extending booms).
• Press the Set button and the Yellow LED
comes On. Release the Set button and the
Green LED comes On to indicate a new limit
has been set.
• Set the Key switch to Active. The Red !
LED & Bleep come On as boom is at height
limit. (The control relay goes O to disable
UPWARD movement, if connected).
• Lower the machine boom from the maximum
height.
• The Red ! LED & Bleep go o at about 90%
of the height limit. (The control relay comes
On again to re-enable UPWARD movement, if
connected).
• The Yellow LED goes o at about 70% of the
height limit.
• The Green LED comes on to indicate the
boom is well within the Height Limit.

M1000003 V1.3 - 11/2021
www.gkdtechnologies.com 8
PRACTICAL OPERATION OF THE SERIES 1-H SYSTEM
Limits
1. The Height Limit must be set at least 15 degrees above Horizontal.
2. The Height Limit must be set with the machine in the ‘worst case’. i.e. equipment at full reach (for
excavators) or extending boom fully extended (for teletruks and machines with extending booms).
3. The Height Limit must be set less than 90 degrees above Horizontal.
4. Height Limit indication comes On at about 95% of the height limit.
5. Height Limit indication goes O at about 90% of the height limit.
6. The Yellow LED comes On at about 75% of the height limit.
7. The Yellow LED goes O at about 70% of the height limit.
8. A Fault LED error condition is given if the boom angle goes outside the set ranges.
9. Height limits are subject to a 5% “Hysteresis”. For example, the Height Limit state comes On at
95% of the Height Limit, & goes O at 90% of the height limit.)
10. The boom can be operated up to 90 degrees above, or below horizontal.
11. A height limit state will only be indicated if the boom is ABOVE horizontal.

www.gkdtechnologies.com M1000003 V1.3 - 11/2021 9
Relay operation
The Relay goes OFF when the Height Limit is reached, or the Series 1-H DC power is lost.
The Relay is ON in Inactive and Set Limit modes to allow any boom movement.
Angle Sensor
When powered up the Green LED on the side of the Angle sensor will flash to show that it is working
correctly.
Test
At power up, all 5 LEDs and the internal sounder come on as a self-test, then go o in turn.
In Active mode, press the Test button to turn on all the LEDs and the Internal Sounder.
Releasing the button causes them all to go o in turn.

M1000003 V1.3 - 11/2021
www.gkdtechnologies.com 10
FAULT CONDITION INDICATION
In Active Mode the Red !LED flashes fast if there is no Height Limit is set.
In Set Limit Mode the Red !LED stays on if there is no Height Limit is set.
Fault LED
If the “Fault” LED is lit, a connection error is present between the 1HLI display and the angle sensor.
Check the CAN bus cable between the display and the angle sensor for damage or incorrect
connection. NOTE: On first switch on, before the Horizontal boom position has been learned, it is
normal for the fault light to flash.
Angle sensor, no LED
The angle sensor LED should be flashing GREEN whilst the system is powered.
No LED showing on the angle sensor may be caused by angle sensor failure, but is more likely to
indicate that no power is being supplied to the sensor through the CAN bus cable.
Angle sensor, red LED
Should the angle sensor LED be RED, an angle sensor internal fault has occurred.

www.gkdtechnologies.com M1000003 V1.3 - 11/2021 11
No motion cut or external alarm
Check to make sure that the display internal relay connection (BLUE wire) is connected to a +V
ignition switched source, as the power to the green and yellow output wires is derived from the blue
power input wire.
Motion cut not working
Ensure that the Horizontal boom position has been learned by the system (see page 14) and that a
valid height limit ABOVE the horizontal position has been set, and that the key switch is in the ACTIVE
position. If still not working, check the YELLOW wire output to the solenoid valve for power, and that
the solenoid has a good chassis earth to the 0V connection.

©GKD Technologies 11-2021
GKD Technologies reserve the
right to change these instructions in
line with the policy of continuous improvement.
17 Cobham Road, Ferndown Industrial Estate, Wimborne, Dorset, UK. BH21 7PE
[phone] [e-mail] www.gkdtechnologies.com