Danfoss EH User guide
MAKING MODERN LIVING POSSIBLE
Technical Information
Electronic Control Modules
EH Modules
powersolutions.danfoss.com
Technical Information EH Modules
Revision history Table of revisions
Date Changed Rev
January 2016 Converted to Danfoss layout 0103
September 2010 New Back cover AC
May 2010 Japan location AB
October 2004 First edition A
2 520L0804 • Rev 0103 • January 2016
Technical Information
EH Modules
Contents
Electronic control modules - EH modules
General.................................................................................................................................................................................................5
Mounting base and accessories - EHB
General.................................................................................................................................................................................................6
Dimensions, code numbers, and weight................................................................................................................................. 7
Electronic flow regulation - EHF
General ................................................................................................................................................................................................8
Function...............................................................................................................................................................................................8
Signal monitoring.............................................................................................................................................................................9
Characteristic..................................................................................................................................................................................... 9
Electrical system ............................................................................................................................................................................10
Technical data................................................................................................................................................................................. 10
Code number and weight...........................................................................................................................................................11
Electronic alarm logic - EHA
General ..............................................................................................................................................................................................12
Function............................................................................................................................................................................................ 13
Electrical system.............................................................................................................................................................................14
Monitoring more than eight functions.................................................................................................................................. 15
Electric remote to mechanical operation..............................................................................................................................16
Technical data................................................................................................................................................................................. 17
Code number and weight...........................................................................................................................................................17
Electronic ramp generator - EHR
General ..............................................................................................................................................................................................18
Function............................................................................................................................................................................................ 18
Signal monitoring..........................................................................................................................................................................19
Electrical system - Principle 1.....................................................................................................................................................20
Electrical system - Principle 2.....................................................................................................................................................21
Ramp times.......................................................................................................................................................................................22
External break contacts................................................................................................................................................................23
KA, KB signals...................................................................................................................................................................................23
Technical data................................................................................................................................................................................. 24
Code number and weight...........................................................................................................................................................24
Electronic speed control - EHS
General ..............................................................................................................................................................................................25
Function............................................................................................................................................................................................ 25
Potentiometer 1..............................................................................................................................................................................26
Potentiometer 2..............................................................................................................................................................................26
Potentiometer (P)...........................................................................................................................................................................27
Recommendation.......................................................................................................................................................................... 27
Input reference............................................................................................................................................................................... 27
Electrical connection.................................................................................................................................................................... 29
Technical data................................................................................................................................................................................. 29
Code number and weight...........................................................................................................................................................30
Electronic, frequency controlled loop speed control - EHSC
General ..............................................................................................................................................................................................31
Adjustment possibilities..............................................................................................................................................................31
Function monitoring.....................................................................................................................................................................32
Adjustments.....................................................................................................................................................................................32
Potentiometer 1 .......................................................................................................................................................................32
Potentiometer 2 .......................................................................................................................................................................33
Potentiometer 3 .......................................................................................................................................................................34
Potentiometer 4 .......................................................................................................................................................................35
Potentiometer (P)...........................................................................................................................................................................35
Resistance (R)...................................................................................................................................................................................36
Electrical system.............................................................................................................................................................................37
Technical data................................................................................................................................................................................. 37
520L0804 • Rev 0103 • January 2016 3
Technical Information
EH Modules
Contents
Required control and feedback frequency signal..............................................................................................................38
Main spools and electrical actuation modules....................................................................................................................38
Code number and weight...........................................................................................................................................................38
Electronic, voltage controlled closed loop speed control - EHSC
General ..............................................................................................................................................................................................39
Adjustment possibilities..............................................................................................................................................................39
Function monitoring.....................................................................................................................................................................40
Adjustments.....................................................................................................................................................................................41
Potentiometer 1 and 2............................................................................................................................................................41
Potentiometer 3 .......................................................................................................................................................................41
Potentiometer 4 .......................................................................................................................................................................42
Potentiometer (P)...........................................................................................................................................................................43
Resistance (R)...................................................................................................................................................................................43
Electrical system.............................................................................................................................................................................45
Technical data................................................................................................................................................................................. 45
Required feedback frequency signal...................................................................................................................................... 46
Main spools and electrical actuation modules....................................................................................................................46
Code number and weight...........................................................................................................................................................47
Electronic closed loop position control - EHC
General ..............................................................................................................................................................................................48
Adjustment possibilities..............................................................................................................................................................48
Inverse function..............................................................................................................................................................................49
Interruption of the signal output............................................................................................................................................. 49
ON/OFF signal t1/t6...................................................................................................................................................................... 50
Redundant position transducer................................................................................................................................................50
Function monitoring.....................................................................................................................................................................51
Adjustment.......................................................................................................................................................................................52
Potentiometer 1 .......................................................................................................................................................................52
Potentiometer 2........................................................................................................................................................................52
Potentiometer 3........................................................................................................................................................................52
Potentiometer 4........................................................................................................................................................................52
Electrical system.............................................................................................................................................................................53
Resistance values........................................................................................................................................................................... 53
Technical data................................................................................................................................................................................. 54
Code numbers and weight.........................................................................................................................................................54
EH modules dimensions
Dimensions.......................................................................................................................................................................................55
4 520L0804 • Rev 0103 • January 2016
Technical Information
EH Modules
Electronic control modules - EH modules
General
Electronic control modules - EH modules
Danfoss electronic control modules are a series of module boxes used for signal matching, for the control
of the electric activating modules of a proportional valve, and for function monitoring inhydraulic
systems. EH modules are built into a plastic box with an 11-pole plug and are designed in compliance
with IEC publication 67, second edition part 1, drawing 67-1-18a.
520L0804 • Rev 0103 • January 2016 5
Technical Information
EH Modules
Mounting base and accessories - EHB
General
Mounting base, 11-pole, for EH modules - EHB
EHB can be mounted using two screws. It can also be clipped onto DIN rails (DIN 46277).
EHB is designed to be wired and contains self-lifting terminals and cross/slotted screws.
On all electrical diagrams with EH modules the terminal connections are located in relation to EHB. If
another mounting base is used, the terminal connections can be re-allocated, but the terminal numbers
will remain the same.
Retaining clip on EH module
Retaining clip in spring steel for additionally securing EH modules on EHB where strong vibrations occur.
The code number covers 10 off retaining clips.
6 520L0804 • Rev 0103 • January 2016
Technical Information EH Modules
Mounting base and accessories - EHB
Dimensions, code numbers, and weight
EHB dimensions in millimeters [inches]
EHB mounting base code number EHB base weight
155U0933 0.065 kg (0.143 lb)
EH module retaining clip
EH module retaining clip code number Quantity
155U0932 10
520L0804 • Rev 0103 • January 2016 7
Technical Information
EH Modules
Electronic flow regulation - EHF
General
Electronic flow regulation - EHF
Function
Danfoss electronic flow regulation EHF is for use where the requirement is individual reduction of the
flow from the two ports of the proportional valve.
The flow can be reduced individually for ports A and B, infinitely down to 25% of maximum flow.
An EHF built into an electrohydraulic system gives very precise control of the working functions.
EHF is supplied for the regulation of two working functions.
Flow adjustment - EHF
EHF must be inserted in the signal connection between the electric remote control lever and PVG
proportional valve.
There are two built-in potentiometers per function. Independently of each other, these will limit the
signal voltage and thereby the flow from ports A and B.
The remote control unit retains its full regulation range because EHF incorporates dead-band
compensation and reduced signal voltage instead of mechanical reduction of the regulation range of the
remote control unit.
8 520L0804 • Rev 0103 • January 2016
Technical Information EH Modules
Electronic flow regulation - EHF
Signal monitoring
EHF has signal monitoring on the signal inputs (terminals 3 and 4). This means that input signals must lie
within the range 0.15 • UDC to 0.85 • UDC.
If the signal is outside the stated range, such as a consequence of short-circuiting to plus or minus supply,
the signal monitoring cuts off the output signal to the proportional valve which then immediately sets
the main spool into neutral position.
If monitoring has cut off the output signal, EHF can only begin functioning again when the supply
voltage has been cut off.
Characteristic
Flow as a function of the input signal and the two potentiometers for the flow limitation at ports A and B
520L0804 • Rev 0103 • January 2016 9
Signal leads
Supply leads
Technical Information EH Modules
Electronic flow regulation - EHF
Electrical system
EHF - electrical system
Technical data
Supply voltage U
Current consumption < 50 mA
Output voltage (US) U
Neutral voltage (US) U
Input signal Remote control lever, potentiometer
Input impedance 12 kΩ at 0.5 • UDC
Output signal Maximum load Two parallelconnected PVEs
10 520L0804 • Rev 0103 • January 2016
DC
11 to 30 V
Maximum ripple 5%
S
U
DC
S
U
DC
Minimum load impedance to 0.5 •
U
DC
0.25 → 0.75
0.5
6 kΩ
Technical Information EH Modules
Electronic flow regulation - EHF
Signal current maximum UDC = 12 V ±0.5 mA
Ambient temperature -30 to +60°C [-22 to 140 °F]
Enclosure to IEC 529 IP 42
EHF must be connected to the supply voltage at the same point as the remote control lever.
Code number and weight
EHF mounting base code number EHF base weight
905 0.10 kg (0.22 lb)
UDC = 24 V ±1.0 mA
520L0804 • Rev 0103 • January 2016 11
Technical Information
Electronic alarm logic - EHA
General
EH Modules
Electronic alarm logic - EHA
Danfoss EHA electronic alarm logic modules are used primarily where together with PVEH electric
activation modules they must meet requirements for optimum system safety.
In principle, EHA can be compared with eight series-connected relays that collect alarm signals from up
to eight PVEH activation modules and via the series connection combine them into a single active output
signal.
The output signal is able to control electric PVPX and PVPE relief valves, normally open (NO) version
which will relieve the LS signal/pump pressure to tank on fault signal from PVEH. These relief functions
make the PVG valves hydraulically inactive.
Alternatively, EHA can be used to control sirens, warning lamps and other alarm sources to indicate
function fault.
12 520L0804 • Rev 0103 • January 2016
Fault-free function Fault function
Technical Information
Electronic alarm logic - EHA
Function
EH Modules
The alarm outputs from the electrically activated PVEHs in a valve group must be connected to EHA.
EHA is built up so that it is able to monitor up to eight PVEH alarm outputs.
With fault-free function, the EHA output signal is internally connected to minus
If one or more of the PVEH alarms indicate a fault, the EHA output signal is cut off immediately.
To ensure correct function, all unused inputs must be connected to minus, i.e. EHA regards all inputs
without connection as a fault. In addition, all input signals exceeding 8 V are also regarded as faults while
signals of less than 3 V are regarded as fault-free.
In the range 3-8 V the condition remains undefined.
EHA automatically resets when the fault condition no longer exists.
520L0804 • Rev 0103 • January 2016 13
DC
U+
Prop 2
Function
Prop 1
Prop 3
N.sw.out
U-
16211
10
PVPX
2
-
3
1
+
1
2
3
U
-
DC
+
E
F3
F2F1
US1UU
S2 S3
- +
U
U-U++
Alarm Logic EHA
be connected to "-".
Unused inputs must
SUPPLY: 11-30V DC
MADE IN DENMARK
155U1805
8 95743
Pin no.
873,15,1651,2,141022
V310176.A
1
2
3
3
1
2
*1
*1
*2
PVEH
PVEH
PVEH
Technical Information EH Modules
Electronic alarm logic - EHA
Electrical system
Electronic alarm logic EHA electrical system
1 To avoid being regarded as a fault, unused inputs must be connected to minus.
E Emergency stop
14 520L0804 • Rev 0103 • January 2016
Technical Information EH Modules
Electronic alarm logic - EHA
Monitoring more than eight functions
With standard connections, EHA will monitor up to eight alarm outputs.
If more outputs are to be monitored, two or more EHAs can be connected in series by allowing the
output from one EHA to control an input on the following EHA. This extends the capacity by seven inputs
for every extra EHA.
520L0804 • Rev 0103 • January 2016 15
Technical Information EH Modules
Electronic alarm logic - EHA
Electric remote to mechanical operation
Changeover between electric remote operation and mechanical operation
1 Switch
2 Unused inputs must be connected to minus
Positions
Position Description Comment
1 Electrical system operation
2 Off
3 Mechanical system
operation
The hydraulics can only be operated by electrical remote control.
The PVEs lock main spools hydraulically and prevent mechanical
operation.
The hydraulics cannot be operated either mechanically or electrically.
The hydraulics can only be operated mechanically.
The relief valve is activated only via the switch.
16 520L0804 • Rev 0103 • January 2016
Technical Information EH Modules
Electronic alarm logic - EHA
Technical data
Code number and weight
Supply voltage U
Current consumtion without output load < 40 mA
Input signal Tapping from PVEH fault
Input impedance >3 kΩ
Output load 30 V / 1.5 A
Ambient temperature -30 to + 60°C [-22 to 140 °F]
Enclosure to IEC 529 IP 42
DC
Maximum ripple 5%
Fault-free signal 0 to 3 V
Fault signal 8 V - UDC/Off
11 to 30 V
monitoring
EHA must be connected to supply voltage at the same point as PVEH.
EHA mounting base code number EHA base weight
155U1805 0.09 kg (0.20 lb)
520L0804 • Rev 0103 • January 2016 17
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