Danfoss PVG 120 Manual

MAKING MODERN LIVING POSSIBLE
Technical Information
Proportional Valve Group
PVG 120
powersolutions.danfoss.com

Revision History Table of Revisions
Date Changed Rev
Mar 2014 Chapters re-order, Modules selection chart JA
Dec 2013 Converted to Danfoss layout – DITA CMS ID
2006 - 2012 Various updates AB - IC
Apr 2006 New edition AA
Technical Information PVG 120 Proportional Valve Group
2520L0356 • Rev JA • Mar 2014

Literature reference for PVG products
General Information Valve System...................................................................................................................................................................................... 6
General Characteristics...................................................................................................................................................................6
Pump Side Module – PVP.............................................................................................................................................................. 6
Basic Module – PVB..........................................................................................................................................................................7
Actuation Modules...........................................................................................................................................................................7
Electronic Accessories.....................................................................................................................................................................7
Remote Controls Units....................................................................................................................................................................8
Function PVG 120 with PVP Open Center.................................................................................................................................................. 9
PVG 120 with PVP Closed Center................................................................................................................................................9
PVG 120 sectional view
Safety in Application Building in safety............................................................................................................................................................................11
Control system examples...................................................................................................................................................... 12
Technical Data PVG 120 technical data................................................................................................................................................................15
PVM, mechanical actuation........................................................................................................................................................15
PVH, hydraulic actuation.............................................................................................................................................................15
PVE, electrical actuation ............................................................................................................................................................. 16
PVPE, electrical relief valve, normally open..........................................................................................................................16
Electrical Actuation PVEO, ON-OFF................................................................................................................................................................................. 18
PVEH, proportional high..............................................................................................................................................................18
PVEH, Inductive Transducer (LVDT – Linear Variable Differential Transformer)................................................20
PVEH, Pulse Width Modulation (Integrated)...................................................................................................................20
PVEH Fault Monitoring.................................................................................................................................................................20
PVEH, connection to fault monitoring output...............................................................................................................21
Technical Characteristics General...............................................................................................................................................................................................22
PVP, pump side module.............................................................................................................................................................. 22
PVB, Basic Module..........................................................................................................................................................................23
PVLP, Shock Valve Characteristic (with Pressure Relief Valve).......................................................................................25
PVLP/PVLA, Suction Function....................................................................................................................................................26
Hydraulic system examples Example of PVG 120 with variable displacement pump..................................................................................................27
Example of PVG 120 with fixed displacement pump........................................................................................................28
Other operating conditions Hydraulic fluids for PVG...............................................................................................................................................................29
Particle Content, Degree of Contamination.........................................................................................................................29
Filtering..............................................................................................................................................................................................29
Conversion Factors........................................................................................................................................................................30
Dimensions PVG 120 dimensions..................................................................................................................................................................... 31
PVM, Lever Positions.....................................................................................................................................................................33
Modules and Code Numbers PVP and PVPV, Pump Side Modules .......................................................................................................................................34
PVP, Accessories for Open Center Pump Side Modules...................................................................................................34
PVB, Basic Modules........................................................................................................................................................................35
PVB, Accessories for Basic Modules ........................................................................................................................................35
PVLA, Suction Valve.......................................................................................................................................................................35
Technical Information PVG 120 Proportional Valve Group
Contents
520L0356 • Rev JA • Mar 2014 3

PVLP, Shock and Suction Valves for A/B Port Connections............................................................................................ 36
PVBS, Main Spools..........................................................................................................................................................................36
PVM, Mechanical Actuation....................................................................................................................................................... 36
PVMD, Cover for Mechanical Actuation.................................................................................................................................37
PVH, Hydraulic Actuation............................................................................................................................................................37
PVHC, High Current Actuator.....................................................................................................................................................37
PVE, Electrical Actuation..............................................................................................................................................................37
PVT, tank side module..................................................................................................................................................................38
PVAS, Assembly Kit........................................................................................................................................................................38
PVG 120 Modules Selection Chart
PVG 120 module selection chart.............................................................................................................................................. 39
Order Specification Ordering of modules for oil flow exceeding 180 l/min [47.6 US gal/min].................................................................43
Order Form.......................................................................................................................................................................................43
Reordering...................................................................................................................................................................................44
Technical Information PVG 120 Proportional Valve Group
Contents
4520L0356 • Rev JA • Mar 2014

Literature reference
Literature title Type Order
number
PVG 32 Proportional valve group Technical Information 520L0344
PVG 100 Proportional valve group Technical Information 520L0720
PVG 120 Proportional valve group Technical Information 520L0356
PVG 32 Metric ports Technical Information 11051935
PVE series 4 Technical Information 520L0553
PVED-CC Electro-hydraulic actuator Technical Information 520L0665
PVED-CX Electro-hydraulic actuator Technical Information 11070179
Basic module for PVBZ Technical Information 520L0721
PVSK module with integrated diverter valve and P-disconnect function Technical Information 520L0556
PVPV / PVPM pump side module Technical Information 520L0222
Combination module PVGI Technical Information 520L0405
PVSP/M Priority module Technical Information 520L0291
Hitch Control System Description
User Manual
11036124
11033753
PVBZ Data sheet 520L0681
PVBZ-HS Data sheet 520L0956
PVBZ-HD Data sheet 11035599
MC024-010 and MC024-012 Controllers Data sheet 520L0712
Technical Information PVG 120 Proportional Valve Group
Literature reference for PVG products
520L0356 • Rev JA • Mar 2014 5

Valve System
Load sensing proportional valve type PVG 120 is a combined directional and flow control valve which is
supplied as a valve group consisting of modules specified to match particular customer needs. The
flexible nature of this valve will allow an existing valve bank to be easily adapted to suit changes in
requirements.
General Characteristics
•Load-independent flow control:
‒Oil flow to an individual function is independent of the load of this function
‒Oil flow to one function is independent of the load pressure of other functions
•Good regulation characteristics
•Central pilot supply built in when the valves are actuated electrohydraulically
•Energy-saving
•Up to eight basic modules per valve group
Pump Side Module – PVP
•Built-in pressure relief valve
•System pressure up to 400 bar [5800 psi]
•Pressure gauge connection
•Versions:
‒Open centre version for systems with fixed displacement pumps
‒Open centre version prepared for an extra relief module
‒Closed centre version for systems with variable displacement pumps
‒Closed centre version without system pressure relief valve for variable displace ment pumps with
built-in pressure relief valve.
Technical Information PVG 120 Proportional Valve Group
General Information
6520L0356 • Rev JA • Mar 2014

Basic Module – PVB
•Integrated pressure compensator in channel P
•Interchangeable spools
•Depending on requirements the basic module can be supplied with:
‒Shock/suction valves
‒Adjustable LS pressure limiting valve for ports A and B
‒LS connection
‒Module for oil flows exceeding 180 l/min [47.6 US gal/min]
‒Different spool variants
Actuation Modules
The basic module is always fitted with mechanical actuation PVM, which can be combined with the
following as required:
•Electrical actuation:
‒PVEH - proportional, high performance (11 - 32 V )
‒PVEO - On/off (12 V == or 24 V ==)
•Cover for hydraulic remote control, PVH
•Cover for mechanically actuated valve group, PVMD
Electronic Accessories
•EHF, low adjustment unit
•EHR, ramp generator
•EHS, speed control
•EHSC, closed loop speed control
•EHA, alarm logic
•EHC, closed loop position control
Technical Information PVG 120 Proportional Valve Group
General Information
520L0356 • Rev JA • Mar 2014 7

Remote Controls Units
PVRE, electrical control unit, 162F…
Prof 1, 162F…
PVREL, electrical control unit, 155U… PVRES, electrical control unit, 155B…
PVRH, hydraulic control unit, 155N…
155N0003 155N0001 155N0004 155N0005 155N0002
Technical Information PVG 120 Proportional Valve Group
General Information
8520L0356 • Rev JA • Mar 2014

PVG 120 with PVP Open Center
When the pump is started and the main spools (1) in the individual basic modules are in neutral position,
oil flows from the pump, through connection P, across the pressure adjustment spool (2) to tank.
The oil flow led across the pressure adjustment spool determines the pump pressure (stand-by pressure).
If a reduced stand-by pressure is required, an extra relief valve PVPH or PVPE can be used in PVP.
When the main spools are actuated the highest load pressure is distributed across the shuttle valve
circuit (3) to the spring chamber behind the pressure adjustment spool (2) and completely or partly
closes the connection to tank.
The pump pressure is applied to the right-hand side of the pressure adjustment spool (2). The pressure
relief valve (4) opens when the load pressure exceeds the set value, allowing pump flow to be diverted
back to tank.
In the basic module the compensator (5) maintains a constant pressure drop across the main spool –
both when the load changes and when a module with a higher load pressure is activated.
Shock and suction valves with a fixed setting (7) and the suction valves (8) on ports A and B are used to
protect individual working functions against overload.
In the basic module it is possible to build in an adjustable LS pressure relief valve (6) to limit the pressure
from each working function.
The LS pressure limiting valve saves energy:
•Without LS pressure limiting valve all the oil flow to the working function will be led across the
combined shock and suction valves to tank if the pressure exceeds the fixed setting of the valves.
•With LS pressure limiting valve an oil flow of only about 2 l/min [0.5 US gal/min] will be led across the
LS pressure limiting valve to tank if the pressure exceeds the valve setting.
PVG 120 with PVP Closed Center
In the closed center version an orifice (9) has been fitted instead of the plug. This means that the pressure
adjustment spool (2) will only open to tank when the pressure in channel P exceeds the pressure relief
valve setting (4).
In load sensing systems the load pressure is led to the pump regulator via the LS connection (10), so the
orifices (11) have been removed, and a plug (12) has been fitted instead of one of the orifices.
In neutral position the pump regulator will set the displacement so that leakage in the system is just
compensated for.
When a main spool is activated, the pump regulator will adjust the displacement so that the set
differential pressure between P and LS is maintained.
The pressure relief valve (4) in PVP is set for a pressure of about 30 bar [435 psi] above maximum system
pressure (set at the pump or an external pressure relief valve).
If the system or the pump regulation has a pressure relief valve, it is possible to use a PVPV pump side
module, without integrated pressure adjustment spool and pressure relief valve.
Technical Information PVG 120 Proportional Valve Group
Function
520L0356 • Rev JA • Mar 2014 9

PVG 120 sectional view
4
10
12
11
11
X-X
X
X
P A
V310100.A
92 1
TPT
pma
A B
A B
3
7 5 1 8
TPT
13
65
LS
TPT
3
13
P B
Legend:
1 – Main spool
2 – Pressure adjustment spool in PVP
3 – Shuttle valve
4 – Pressure relief valve in PVP
5 – Pressure compensator in PVB
6 – LS pressure relief valve in PVB
7 – Shock and suction valve PVLP
8 – Suction valve PVLA
9 – Orifice, closed center PVP; Plug, open center PVP
10 – LS connection
11 – Orifice, open center PVP
12 – Plug, closed center PVP
Technical Information PVG 120 Proportional Valve Group
PVG 120 sectional view
10 520L0356 • Rev JA • Mar 2014

Building in safety
All makes and all types of control valves (incl. proportional valves) can fail. Thus the necessary protection
against the serious consequences of function failure should always be built into the system. For each
application should be made an assessment for the consequences of pressure failure and uncontrolled or
blocked movements.
To determine the degree of protection that is required to be built into the application, system tools such
an FMEA (Failure Mode and Effect Analysis) and Hazard and Risk Analysis can be used.
IEC FMEA – EN 61508.
FMEA is a tool used for analyzing potential risks. This analytical technique is utilized to define, identify,
and prioritize the elimination or reduction of known and/or potential failures from a given system before
it is released for production. Please refer to IEC FMEA Standard EN 61508.
Hazard and Risk Analysis – ISO 12100-1/14121.
This analysis is a tool used in new applications as it will indicate whether there are special safety
considerations to be meet according to the machine directives EN 13849. Dependent on the determined
levels conformety this analysis will detirmine if any extra requirements for the product design,
development process, production process or maintenance, i.e. the complete product life cycle.
W
Warning
All makes/brands and types of directional control valves inclusive proportional valves can fail and
cause serious damage. It is therefore important to analyze all aspects of the application. Because the
proportional valves are used in many different operation conditions and applications, the manufacturer
of the application is alone responsible for making the final selection of the products – and assuring that
all performance, safety and warning requirements of the application are met. The process of choosing the
control system and safety levels is governed by the machine directives EN 13849 (Safety related
requirements for control systems).
PVG 32 – mainly used in system with fixed displacement pumps.
•PVSK, commonly used in crane application - full flow dump
•PVPX, LS dump to tank
PVG 100 – Alternative LS dump or pilot supply disconnect.
•PVPP, pilot oil supply shut off
•External cartridge valve connecting LS Pressure to Tank
•External cartridge valve connecting main Pressure to Tank
PVG 120 – Pump disconnect / block for variable pumps.
•PVPE, full flow dump for the PVG 120.
Technical Information PVG 120 Proportional Valve Group
Safety in Application
520L0356 • Rev JA • Mar 2014 11

Control system examples
Example of a control system for manlift using PVE fault monitoring input signals and gnals from external
sensors to ensure the PLUS+1®main controllers correct function of the manlift.
1 – Main power supply 5 – Main controller with safety logic
2 – Emergency stop/man present switch 6 – PVG 32 control valve group
3 – HMI/Joystick control 7 – Hydraulic deactivation
4 – Movement detection sensors
W
Warning
It is the responsibility of the equipment manufacturer that the control system incorporated in the
machine is declared as being in confirmity with the relevant machine directives.
Technical Information PVG 120 Proportional Valve Group
Safety in Application
12 520L0356 • Rev JA • Mar 2014

Electrical block diagram for the illustration above
Example of a typical wiring block diagram using PVEH with neutral power off switch and fault monitoring
output for hydraulic deactivation.
Fault detection output
high=on
low=off
Alarm
logic
2)
Memory
3)
E1 E2
Output
AND
OR
Neutral detection / Supply control
signal
≠
neutral
OFF
Delay
1)
2(UDC2)
3( )
4(Error)
1(US)
PVEH
with AMP
connector
2(UDC2)
3( )
4(Error)
1(US)
PVEH
with AMP
connector
Hydraulic
deactivation
Neutral detection / Supply control
signal
≠
neutral
OFF
Delay
1)
PVE 1
PVE 2
Emergency
stop Man present
switch
C
C
D
B
B
A
P301 318
A – Emergency stop/man present switch
B – PVEH fault monitoring signals
C – Neutral signal detection
D – Hydraulic deactivation
Technical Information PVG 120 Proportional Valve Group
Safety in Application
520L0356 • Rev JA • Mar 2014 13

System Control Logic, e.g. PLUS+1®for signal monitoring and triggering signal for deactivation of the
hydraulic system.
W
Warning
It is the responsibility of the equipment manufacturer that the control system incorporated in the
machine is declared as being in confirmity with the relevant machine directives.
Example of fault monitoring for deactivation of the hydraulic system with extra fault inputs using the PVE’s
with DI (Direction Indication) function.
Neutral detection / Supply control
signal
≠
neutral
OFF
Delay
1)
Fault detection output
2(UDC2)
3( )
4(Error)
1(US)
2(DI-B)
3( )
1(DI-A)
PVEH-DI
AMP connector
4(UDC)
PVEH-DI
AMP supply
connector
2(UDC2)
3( )
4(Error)
1(US)
2(DI-B)
3( )
1(DI-A)
PVEH-DI
AMP connector
4(UDC)
PVEH-DI
AMP supply
connector
AND
Hydraulic
deactivation
high=on
low=off
Neutral detection / Supply control
signal
≠
neutral
OFF
Delay
1)
PVE 1
PVE 2
Fault detection
Delay
DI
Logic Memory
US
DI-A
DI-B 2)
4)
3)
Output
Fault detection
Delay
DI
Logic Memory
US
DI-A
DI-B 2)
4)
3)
Output
OR
Emergency
Stop Man present
switch
P301 319
System Control Logic e.g. PLUS+1®for signal monitoring and triggering signal for deactivation of the
hydraulic system. Other non-electrical modules which can be used in connection with hydraulic
deactivation at different levels.
W
Warning
It is the responsibility of the equipment manufacturer that the control system incorporated in the
machine is declared as being in confirmity with the relevant machine directives.
Technical Information PVG 120 Proportional Valve Group
Safety in Application
14 520L0356 • Rev JA • Mar 2014

PVG 120 technical data
Maximum pressure Port P continuous 350 bar [5075 psi]
intermittent1) 400 bar [5800 psi]
Port A/B 400 bar [5800 psi]
Port T, static/dynamic 25 bar/40 bar [365/580 psi]
Oil flow
See Oil flow characteristics for more information.
Port P, rated max. 240/300 l/min [63.4/79.3 US gal/min]
Port A/B2) 65/95/130/180/ 210/240
l/min
[17.2/25.1/34.3/47.6/
55.5/63.4 US gal/min]
Spool travel ± 8 mm [± 0.32 in]
Dead band (± 25%) ± 2 mm [± 0.08 in]
Maximum internal leakage
at 100 bar, 21 mm2/s
A/B→T, without shockvalve 90 cm3/min [5.5 in3/min]
A/B→T, with shockvalve 95 cm3/min [5.6 in3/min]
Oil temperature (inlet temperature) Recommended temperature 30 to 60°C [86 to 140°F]
Min. temperature –30°C [–22°F]
Max. temperature +90°C [+194°F]
Ambient temperature –30 to +60°C [–22 to +140°F]
Oil viscosity Operating range 12 to 75 mm2/s [65 SUS to 347 SUS]
Min. viscosity 4 mm2/s [39 SUS]
Max. viscosity 460 mm2/s [2128 SUS]
Filtering / Max. contamination (ISO 4406)
See Filtering for more information.
23/19/16
Oil consumption in pressure reduction valve for PVT at PVE pilot-oil supply 0.4 l/min [0.1 US gal/min]
1) Intermittent operation: the permissible values may occur for max. 10% of every minute.
2) See Order Form for more information regarding the ordering or conversion of valve groups for oil flows
exceeding 180 l/min [47.6 US gal/min].
PVM, mechanical actuation
PVM, Mechanical Actuation
PVM data Neutral position Max. spool travel
Operating force PVM + PVMD
PVM + PVE (without voltage)
2.8 ± 0.2 N•m
[24.8 ± 1.8 lbf•in]
4.0 ± 0.2 N•m
[35.5 ± 1.8 lbf•in]
PVM + PVH 4.7 ± 0.2 N•m
[41.6 ± 1.8 lbf•in]
12.8 ± 0.2 N•m
[113.3 ± 1.8 lbf•in]
Possible control lever positions: 2 × 5
Regulation range, control lever: ±19,5°
PVH, hydraulic actuation
PVH, Hydraulic Actuation
PVH data Pressure, bar [psi]
Control range 5 to 15 [75 to 220]
Maximum pilot pressure, static 35 [510]
Technical Information PVG 120 Proportional Valve Group
Technical Data
520L0356 • Rev JA • Mar 2014 15

PVH, Hydraulic Actuation (continued)
PVH data Pressure, bar [psi]
Maximum pressure on port T
(It is recommended that the tank connection from the hydraulic remote control unit
PVRH is taken directly to tank.)
3 [45 ]
PVE, electrical actuation
PVE, electrical actuation
PVE actuation PVEO ON/OFF PVEH Proportional
High
Hysteresis (applies to the electrical
actuation only) 1) Typical - 4%
Reaction time from neutral position to max.
spool travel
Typical 250 ms 250 ms
Maximum 350 ms 280 ms
Reaction time from max. spool travel to
neutral position2) Typical 240 ms 150 ms
Maximum 330 ms 200 ms
Pilot oil flow pr. PVE Neutral position without voltage 0 l/min / [0 US gal/min]
Locked with voltage 3) 0 l/min / [0 US gal/min]
Enclosure to IEC 529 IP65
1) The hysteresis is stated at rated and f = 0,02 Hz for a cycle. One cycle includes the movement from
neutral position to max. spool travel direction A, via neutral position to max. spool travel in direction B,
and back to neutral position. Further information can be obtained by contacting the Danfoss Power
Solutions Sales Organization.
2) Reaction times for PVEH is reduced by 20 by 30 ms if the voltage is not interrupted during the neutral
positioning (remote control lever without neutral position switch).
3) Total oil consumtion for a spool movement from N to full A or B: 0.0035 l [0.0009 US gal].
PVPE, electrical relief valve, normally open
PVPE, electrical relief valve, normally open
Maximum operation pressure 350 bar [5085 psi]
Maximum pressure drop at flow of 0.2 l/min [0.053 US gal/min] 1.2 bar [17 psi]
Oil temperature (inlet
temperature)
Recommended temperature 30 to 60 °C [86 to 140 °F]
Min. temperature –30 °C [–22 °F]
Max. temperature 90 °C [194 °F]
Maximum coil surface temperature 155 °C [311 °F]
Ambient temperature –30 to +60 °C [–22 to +140 °F]
Oil viscosity Operating range 12 to 75 mm2/s [65 to 347 SUS]
Min. viscosity 4 mm2/s [39 SUS]
Max. viscosity 460 mm2/s [2128 SUS]
Response time for pressure relief to tank 600 ms
Enclosure to IEC 529 IP 65
Rated voltage 12 V 24 V
Technical Information PVG 120 Proportional Valve Group
Technical Data
16 520L0356 • Rev JA • Mar 2014

PVPE, electrical relief valve, normally open (continued)
Maximum permissible deviation from rated supply voltage ± 10 % ± 10 %
Current consumption at rated
voltage
at 22 °C [72 °F] coil temperature 1.55 A 0.78 A
at 85 °C [230 °F] coil temperature 1.0 A 0.5 A
Power consumption at 22 °C [72 °F] coil temperature 19 W 19 W
at 85 °C [230 °F] coil temperature 12 W 12 W
Technical Information PVG 120 Proportional Valve Group
Technical Data
520L0356 • Rev JA • Mar 2014 17

PVEO, ON-OFF
The main features of PVEO:
•Compact
•Robust operation
•Hirschmann or AMP connector
•Low electrical power
V310185.A
P
A
T
P
T
p
B
PVEO parameters
Supply voltage UDC rated 12 V DC 24 V DC
range 11 V to 15 V 22 V to 30 V
maximum ripple 5%
Current consumption at rated voltage 0.65 A @ 12 V 0.33 A @ 24 V
Signal voltage (PVEM) neutral 0.5 x UDC
A-port ↔B-port 0.25 • UDC to 0.75 • UDC
Signal current at rated voltage (PVEM) 0.25 mA 0.50 mA
Input impedance in relation to 0.5 • UDC 12 KΩ
Power consumption 8 W
PVEH, proportional high
PVEH adjusts the main spool position so that it corresponds to an electrical control signal – for example
from a remote control unit.
The control signal (set-point signal) is converted into a hydraulic pressure which moves the main spool.
The position of the main spool is converted in the positional transducer (C) to an electric signal (feed-
back signal). This signal is registered by the electronics.
The variation between the set-point signal and feed-back signal actuates the solenoid valves, thus the
hydraulic pressure moves the main spool into the correct position.
Technical Information PVG 120 Proportional Valve Group
Electrical Actuation
18 520L0356 • Rev JA • Mar 2014

The main features of PVEH:
•Inductive transducer
•Integrated pulse width modulation
•Low hysteresis
•Fast reaction time
•Hirschmann or AMP connector
•Fault monitoring with transistor output for signal source
•Low electrical power
•No set-up procedure
V310099.A
P
A
T
P
T
B
p
C
PVEH parameters
Supply voltage UDC Rated and Range 11 V to 32 V
Maximum ripple 5%
Current consumption at rated voltage 0.57 (0.33) A @ 12 V 0.3 (0.17) A @ 24 V
Signal voltage Neutral 0.5 x UDC
A-port ↔B-port 0.25 • UDC to 0.75 • UDC
Signal current at rated voltage 0.25 mA to 0.70 mA
Input impedance in relation to 0.5 • UDC 12 KΩ
Input capacitor 100 ηF
Power consumption 7 (3.5) W
PVEH Maximum load 100 mA 60 mA
Reaction
time at fault
Active / Passive 500 ms 250 ms
Technical Information PVG 120 Proportional Valve Group
Electrical Actuation
520L0356 • Rev JA • Mar 2014 19

PVEH, Inductive Transducer (LVDT – Linear Variable Differential Transformer)
When the main spool is moved a voltage is induced proportional to the spool position. The use of LVDT
gives contact-free (proximity) registration of the main spool position. This means an extra-long working
life and no limitation as regards the type of hydraulic fluid used. In addition, LVDT gives a precise position
signal of high resolution.
PVEH, Pulse Width Modulation (Integrated)
Positioning of the main spool in PVEH is based on the pulse width modulation principle. As soon as the
main spool reaches the required position, modulation stops and the spool is locked in position.
PVEH Fault Monitoring
A fault monitoring system is provided in all PVEA, PVEH and PVES modules.
The system is available in two versions:
•The active fault monitoring type, which provides a warning signal, deactivates the solenoid valves
and drives the spool in neutral.
•The passive fault monitoring type, which provides a warning signal only.
Both active and passive fault monitoring systems are triggered by three main events:
1. Input signal monitoring – The input signal voltage is continuously monitored. The permissible
range is between 15% and 85% of the supply voltage. Outside this range the section will switch into
an active error state.
2. Transducer supervision – If one of the wires to the LVDT sensor is broken or short-circuited, the
section will switch into an active error state.
3. Supervision of the closed loop – The actual position must always correspond to the demanded
position (input signal). If the actual spool position is further than the demanded spool position
(>12%, PVEA: >25%), the system detects an error and will switch into an active error state. On the
other hand, a situation where the actual position is closer to neutral than that demanded will not
cause an error state. This situation is considered “in control”.When an active error state occurs, the
fault monitoring logic will be triggered.
Active fault monitoring:
•A delay of 500 ms (PVEA: 750 ms) before anything happens.
•The solenoid valve bridge will be disabled and all solenoid valves will be released.
•An alarm signal is sent out through the appropriate pin connection.
•This state is memorized and continues until the system is actively reset (by turning off the supply
voltage).
Passive fault monitoring:
•A delay of 250 ms (PVEA: 750 ms) before anything happens.
•The solenoid valve bridge will not be disabled but still control the main spool position.
•An alarm signal is sent out through the appropriate pin connection.
•This state is not memorized. When the erroneous state disappears, the alarm signal will turn to
passive again. However, the signal will always be active for a minimum of 100 ms when triggered.
To prevent the electronics from going into an undefined state, a general supervision of the power supply
and the internal clock frequency is made. This function applies to PVEH - and will not activate fault
monitoring:
1. High supply voltage – The solenoid valves are disabled when the supply voltage exceeds 36 V, and
the main spool will return/stay in neutral.
2. Low supply voltage – The solenoid valves are disabled when the supply voltage falls below 8.5 V,
and the main spool will return/stay in neutral.
Technical Information PVG 120 Proportional Valve Group
Electrical Actuation
20 520L0356 • Rev JA • Mar 2014