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PVED-CC4
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Danfoss PVED-CC4 User guide

User Manual
Electrohydraulic Actuator
PVED-CC4, Series 7
www.danfoss.com
User Manual
Revision history Table of revisions
Date Changed Rev
February 2021 First edition 0101
2 | © Danfoss | February 2021 BC368572537192en-000101
User Manual

Contents

Reference
General Information
PVED-CC4 functionality
PVED-CC4 safety description
Technical data
Acronyms used for PVG and PVE................................................................................................................................................ 7
Literature reference for PVG/PVE products.............................................................................................................................8
Standards used for PVED-CC4......................................................................................................................................................9
PVED-CC4 introduction................................................................................................................................................................10
PVE stands for PVE actuator ...................................................................................................................................................... 11
Overview for PVED-CC4............................................................................................................................................................... 12
PVG functionality............................................................................................................................................................................14
Mechanical sub-system............................................................................................................................................................... 16
Housing........................................................................................................................................................................................16
PVED-CC4 Cable kit..................................................................................................................................................................16
PVED-CC4 mounting............................................................................................................................................................... 17
Linear Variable Differential Transducer (LVDT)..............................................................................................................18
Spool neutral spring................................................................................................................................................................ 18
Hydraulic subsystem.....................................................................................................................................................................18
Computerized sub-system..........................................................................................................................................................19
Power On Self Test (POST).....................................................................................................................................................19
PVED-CC4 full operational mode overview.....................................................................................................................19
PVED-CC4 hand operational mode overview.................................................................................................................19
Emergency mode......................................................................................................................................................................20
Fault mode overview...............................................................................................................................................................20
Settings and system data............................................................................................................................................................20
PVED-CC4 Process data.......................................................................................................................................................... 20
OEM data..................................................................................................................................................................................... 20
Spool data................................................................................................................................................................................... 20
General part details..................................................................................................................................................................20
PVED-CC4 Logging........................................................................................................................................................................21
Definition.......................................................................................................................................................................................... 22
Concept............................................................................................................................................................................................. 22
POST–Power On Self Test............................................................................................................................................................22
PVED-CC4 runtime fault monitoring.......................................................................................................................................22
Fault origin category............................................................................................................................................................... 22
Fault severity level....................................................................................................................................................................23
PVED-CC4 fault Reaction............................................................................................................................................................. 23
Recorded and reported solenoid disabling ................................................................................................................... 23
Recorded and reported ignorance ....................................................................................................................................23
Unrecorded reaction .............................................................................................................................................................. 23
PVED-CC4 fault recovery............................................................................................................................................................. 23
Reboot ......................................................................................................................................................................................... 23
Resume ........................................................................................................................................................................................23
Declaration of Conformity.......................................................................................................................................................... 24
PVED-CC4 operational conditions........................................................................................................................................... 24
Reaction times.................................................................................................................................................................................24
PVED-CC4 Dimensions and layout...........................................................................................................................................25
Hydraulic data................................................................................................................................................................................. 27
Pilot oil system...........................................................................................................................................................................27
Communication........................................................................................................................................................................ 28
PVED-CC4 LED ..................................................................................................................................................................... 28
CAN...........................................................................................................................................................................................29
Parameter description............................................................................................................................................................ 29
Commercial identifiers ..................................................................................................................................................... 30
Communication identifiers .............................................................................................................................................30
Firmware identifiers........................................................................................................................................................... 30
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Contents
Service parameters............................................................................................................................................................. 30
Valve interface settings ....................................................................................................................................................30
Communication parameters...........................................................................................................................................30
Safety parameters............................................................................................................................................................... 31
Behavior parameters..........................................................................................................................................................31
Name field J1939 ................................................................................................................................................................31
Function instance................................................................................................................................................................31
Component ID additional information........................................................................................................................32
Part number.......................................................................................................................................................................... 32
Serial number........................................................................................................................................................................32
Software naming.................................................................................................................................................................32
Scaling.....................................................................................................................................................................................32
Slope curve............................................................................................................................................................................33
Ramp........................................................................................................................................................................................33
Invert ports............................................................................................................................................................................ 34
Float threshold.....................................................................................................................................................................34
AVEF send out time............................................................................................................................................................ 34
AVC time out (AVCTO).......................................................................................................................................................34
Power save enable..............................................................................................................................................................34
Fault recovery – Fault monitoring mode....................................................................................................................35
Fault monitoring General Time Out (GTO).................................................................................................................35
Fault monitoring Float Time Out (FTO).......................................................................................................................35
KWP2000 Enable..................................................................................................................................................................35
KWP2000 Id............................................................................................................................................................................35
KWP2000 max time.............................................................................................................................................................35
Spool curve overview........................................................................................................................................................ 36
Float spools............................................................................................................................................................................36
Warnings
PVED-CC4 warnings...................................................................................................................................................................... 37
ISO 11783 CAN interface
Parameter setting.......................................................................................................................................................................... 38
Software ID.......................................................................................................................................................................................39
Component identification message........................................................................................................................................39
Requesting PGN’ s..........................................................................................................................................................................40
Fault mode error messages........................................................................................................................................................41
State machine and operational modes
Power On Self Test.........................................................................................................................................................................43
uCSM...................................................................................................................................................................................................43
AVEF....................................................................................................................................................................................................44
AVEF interpretation................................................................................................................................................................. 44
AVEF data.....................................................................................................................................................................................46
PVED-CC full operational mode................................................................................................................................................47
Closed loop.......................................................................................................................................................................................47
PVED-CC spool positioning ....................................................................................................................................................... 47
Flow control..................................................................................................................................................................................... 47
PVED-CC entering hand operational mode..........................................................................................................................48
PVED-CC4 emergency stop........................................................................................................................................................ 49
Error description
Error code walk through..............................................................................................................................................................50
Non-expected event................................................................................................................................................................50
Recovery.......................................................................................................................................................................................50
PVED-CC settings......................................................................................................................................................................50
General timeout (GTO)............................................................................................................................................................50
Float timeout (FTO)..................................................................................................................................................................50
Auxiliary valve timeout (AVCTO).........................................................................................................................................50
Power save (OEM).....................................................................................................................................................................50
Spool curve................................................................................................................................................................................. 50
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Ordering
Code numbers
Service Tool
Float available (spool).............................................................................................................................................................51
PVED-CC4 error messages.......................................................................................................................................................... 51
1’s complement redundancy test.......................................................................................................................................51
1st boot ....................................................................................................................................................................................... 51
Reserved.......................................................................................................................................................................................51
Division by zero.........................................................................................................................................................................51
CapCom values .........................................................................................................................................................................51
Variable truncation...................................................................................................................................................................52
Verified write to cell error .....................................................................................................................................................52
Reserved.......................................................................................................................................................................................52
Interpolation check..................................................................................................................................................................52
Estimate calibration values error........................................................................................................................................ 52
PWM calibration values error .............................................................................................................................................. 52
Mechanical Spool Compensation values.........................................................................................................................53
Reserved.......................................................................................................................................................................................53
Spool data and Float available.............................................................................................................................................53
Reserved.......................................................................................................................................................................................53
Reserved.......................................................................................................................................................................................53
CRC16 check / Parameter memory.....................................................................................................................................53
Fall back to old values.............................................................................................................................................................54
CRC16 check / Program memory........................................................................................................................................54
Main spool cannot reach neutral from retract...............................................................................................................54
LVDT wiring error .....................................................................................................................................................................54
Power supply above specified range................................................................................................................................ 54
Power supply below specified range................................................................................................................................ 54
No answer on handshakes ................................................................................................................................................... 55
Power-on self test failed ........................................................................................................................................................55
Time value for CL control out of range.............................................................................................................................55
Main spool cannot reach neutral........................................................................................................................................55
Main spool cannot reach float position............................................................................................................................55
Main spool not in neutral at boot up.................................................................................................................................56
Main spool position is greater than the reference....................................................................................................... 56
Main spool position and reference are in opposite directions................................................................................ 56
Float threshold has not been passed................................................................................................................................ 56
Time guarding on Auxiliary Valve Command................................................................................................................ 56
Illegal CAN address ................................................................................................................................................................. 57
Command out of range .........................................................................................................................................................57
Scaling error ...............................................................................................................................................................................57
Ramps error ................................................................................................................................................................................57
Float threshold error ...............................................................................................................................................................57
Dead band compensation error .........................................................................................................................................57
Slope error ..................................................................................................................................................................................58
Shape error..................................................................................................................................................................................58
Invert port error ........................................................................................................................................................................58
Illegal combination of Port Flow Command and Blocked state..............................................................................58
Illegal combination of Port Flow Command and Float state....................................................................................58
Port flow command above 100%....................................................................................................................................... 58
Illegal valve state ......................................................................................................................................................................59
Illegal valve state and illegal port flow command........................................................................................................59
Illegal combination of inverted ports and float properties.......................................................................................59
Errors overview table...............................................................................................................................................................59
Parameter Agreement Template..............................................................................................................................................61
Factory settings for spare part PVED-CC4.............................................................................................................................61
PVED-CC4 code numbers............................................................................................................................................................62
Service Tool Overview..................................................................................................................................................................64
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Contents
Requirements.................................................................................................................................................................................. 64
PLUS+1® PVE Service Tool...........................................................................................................................................................65
Service pages...................................................................................................................................................................................65
Use of the service tool..................................................................................................................................................................66
Examination of a PVED-CC (ECU)..............................................................................................................................................67
Notes on examination process............................................................................................................................................ 68
Process data screen.......................................................................................................................................................................69
Live view screen..............................................................................................................................................................................70
Spool data screen...........................................................................................................................................................................71
OEM data screen.............................................................................................................................................................................72
Diagnostic screen...........................................................................................................................................................................73
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Reference

Acronyms used for PVG and PVE

Acronyms Description
ATEX Certificated for use in explosive environment AVC Auxiliary Valve Command - ISOBUS/J1939 standard signal for valve control AVCTO Auxiliary Valve Command Time Out - Fault monitoring setting AVEF Auxiliary Valve Estimated Flow - ISOBUS/J1939 standard signal for valve feedback CAN Controller Area Network - Communication method used by PVED CLC Closed Loop Circuit CRC Cyclic Redundancy Check - Method for ensuring validity of data.
-DI PVE with Direction Indication DM1 Diagnostic Message 1 - J1939 message informing about present fault DM2 Diagnostic Message 2 - J1939 message informing about fault history DM3 Diagnostic Message 3 - J1939 message clearing fault history DSM Device State Machine. Deterministic description of system process ECU Electronic Control Unit EH Electro Hydraulic
-F PVE for Float spool. Two variants: 4 pin with float at 75%. 6 pin with separate float. FMEA Failure Mode Effect Analysis ISOBUS Communication standard for CAN J1939 Communication standard for CAN LED Light Emitting Diode LS Load Sensing LVDT Linear Variable Differential Transducer - Position sensor NC Normally Closed solenoid valve in PVE NC-H Normally Closed standard solenoid valve in PVEH NC-S Normally Closed solenoid valve Super in PVES NO Normally Open solenoid valve in PVE PLC Programmable Logical Circuit PLUS+1 POST Power On Self Test. Boot up evaluation for PVED Pp Pilot Pressure. The oil gallery for PVE actuation PVB Proportional Valve Basic module - valve slice PVBS Proportional Valve Basic module Spool PVBZ Proportional Valve Basic module Zero leakage PVE Proportional Valve Electric actuator PVEA PVE variant with 2-6 % hysteresis PVED PVE variant Digital controlled via CAN communication PVEH PVE variant with 4-9% Hysteresis PVEM PVE variant with 25-35% hysteresis PVEO PVE variant with ON/OFF actuation PVEP PVE variant PWM controled PVES PVE variant with 0-2% hysteresis PVEU PVE variant with US 0-10V PVG Proportional multi-section Valve Group PVHC PV variant with High Current controlled valve actuator PVM Proportional Valve Manual control with handle PVP Proportional Valve Pump side module.Inlet
®
Trademark for Danfoss controllers and programming tool
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User Manual
Reference
Acronyms Description
PVS Proportional Valve end plate PVSK Proportional Valve end plate crane. Inlet module with Spool Control PWM Pulse Width Modulation S4 DJ Series 4 Digital J1939 service tool software for PVED-CC SAE Society Automotive Engineering
-R PVE with Ramp function
-NP PVE with solenoid disable in Neutral Position
-SP PVE with Spool Position feedback uC Microcontroller uCSM Microcontroller State Machine U
DC
U
S

Literature reference for PVG/PVE products

Literature reference
Literature title Type Order
PVG 32 Proportional valve group Technical Information BC152886483
PVG 100 Proportional valve group Technical Information BC152886483
PVG 120 Proportional valve group Technical Information BC152886483
PVG 32 Metric ports Technical Information BC152886484
PVED-CC Electro-hydraulic actuator Technical Information 520L0665 PVED-CX Electro-hydraulic actuator Technical Information BC152886483
Basic module for PVBZ Technical Information BC152886484
PVSK module with integrated diverter valve and P-disconnect function Technical Information BC152886484
PVPV / PVPM pump side module Technical Information BC152886484
Combination module PVGI Technical Information BC152886483
PVSP/M Priority module Technical Information BC152886484
Power supply Direct Current; also called V Steering voltage for the PVE control; also called V
for battery voltage
bat
S
number
664
475
344
163
682
167
133
316
392
066
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Reference

Standards used for PVED-CC4

International Organization for Standardization:
•
ISO 11898-2 Road vehicles, CAN, Part 2, High-speed medium access unit (physical layer)
‒
ISO 13766:2006(E) Earth moving machinery, Electromagnetic compatibility
‒
ISO 13849 Safety of Machinery
‒
EN 982: 1996 + A1:2008, Safety of machinery – Safety requirements for fluid power systems and their
•
components, Hydraulics SAE J 1939
•
ISOBUS: ISO 11783 CAN Interface
•
EU Directive: EMC directive 2004/108/EC
•
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General Information

PVED-CC4 introduction

The Danfoss PVED-CC4 is a digital (D) controlled PVE-Series 7 actuator for PVG 32 and PVG 100. The PVED­CC4 follows the modular Danfoss concept.
CC is an abbreviation for CAN bus Communication. The communication is compliant to the SAE J1939 protocol and the ISOBUS standard for flow control.
The PVED-CC4 has proven its worth and is used in various types of mobile hydraulic applications with high demands to precision and controllability.
The PVED-CC4 can be controlled by a Danfoss PLUS+1® GUIDE application or other devices capable of using communication as defined in this Technical Information.
Customizing of the PVED-CC4 is done by parameter setting. Settings can be made by the PLUS+1® Service Tool, the WebGPI service tool or by a CAN gateway that have the same abilities.
PVG with PVED-CC4 can be delivered with customer defined settings out of factory.
PVG with PVED-CC4
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General Information
PVED-CC4 with DEUTSCH connector PVED-CC4 with AMP connector

PVE stands for PVE actuator

The Danfoss PVE is built on more than thirty years experience of electrical valve control and is the perfect fit for our high performance proportional valves PVG 32, PVG 100 and PVG 120, as it is for our EH steering.
All our products are developed in close cooperation with system manufacturers from the mobile hydraulic market. That is the reason for our high performance in all market segments
The PVE can be controlled from a switch, a joystick, a PLC, a computer or a Danfoss PLUS+1® micro­controller. The PVE is available in multiple variants. A short list here just gives the main variations.
Available PVE variants
Actuation On/Off
Proportional - Closed loop controlled Proportional - Direct control
Control signal Voltage
PWM Current (PVHC) CAN bus
Precision Standard precision
High precision Super high precision
Feedback Spool position
Direction indicator Error None
Connectors DEUTSCH
AMP DIN/Hirschmann
Fault detection and reaction Active
Passive None
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General Information

Overview for PVED-CC4

Available PVE variants (continued)
Power supply 11 V – 32 V multi-voltage
12 V 24 V
With the PVED-CC4 a hydraulic application with PVG can have up to sixteen individually controlled valves on one CAN bus. Giving full control and feedback for every work function.
The oil flow out of the work function (A- or B-port) can be controlled by a combination of the following:
PVED-CC4 controlling the spool position using pilot oil pressure.
•
A handle (PVM) in mechanical interface with the spool.
•
PVG 32 structural lay-out with naming
A A-port
B B-port
C PVS end plate
D PVB basic module
E Connector pin
T Tank port
P Pump supply port
The PVED-CC4 uses the ISOBUS and J1939 protocol, thus following the standard protocols. The physical layer for CAN communication applies to ISO 11898-2 high speed CAN.
The spool is controlled by flow commands in steps of 0.4% or by spool position with 250 positions in each direction and dead band compensation. Monitored manual operation is possible.
The embedded system also monitors safety. Spool position, communication, electronics, memory, calculations and temperature are continuously evaluated and all violations are broadcasted and logged.
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General Information
To avoid unnecessary power consumption, the PVED-CC4 has the Power Save feature, where power consumption is reduced by almost 90% when the spool is in neutral.
Standard mounted PVG, PVED-CC4 with DEUTSCH connector
Standard mounted PVG, PVED-CC4 with AMP connector
Option mounted PVG with PVSK, PVED-CC4 with DEUTSCH connector
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General Information

PVG functionality

Option mounted PVG with PVSK, PVED-CC4 with AMP connector
This chapter will give an overview of the PVG and its functionality.
Valve section with naming - standard mounted - seen from PVP
The PVG valve distributes oil from pump flow to a particular work function in the application via a specific valve section. This is done by moving the spool (PVBS).
Depending on the choice of components the oil work flow enters the PVG through the PVP (proportional valve pump side module) or the PVSK (proportional valve end plate for crane) and enters the PVB (proportional valve basic module) via the P gallery and leaves through the T gallery.
In the figure above you see a valve section seen from PVP towards PVSK with the PVM and PVE standard mounted. PVM and PVE can in general be interchanged, that is called option mounted.
With the spool in neutral, where it is kept by the neutral spring, the connection to the application via ports is blocked.
Moving the spool towards the PVE, as in figure 4, opens a connection between P and A and also between B and T. This is done by either pushing the PVM or sending a retract command to PVED. The PVED move the spool by letting Pilot Oil Pressure (Pp) push on the right end of the PVBS and releasing pressure from the left end. For details on PVG please see relevant technical information.
Any PVG with PVM can be operated by PVM alone, independent of a power supply. Any PVG with PVED­CC4 can monitor PVBS if power and communication conditions are present.
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POST
Device state
machine
DSM
Full
Operational
mode
Emergency
mode
Fault
mode
Hand
Operational
mode
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PVED-CC4 functionality

This section main focus is to provide a brief overview before heading into the following technical chapters. Understanding this section is regarded as a minimum in order to understand the use of the actuator.
Before any installation and use of the PVED-CC4 it is highly recommended that the user understands the technical chapters as well.
The PVED-CC4 features four different modes of operation: Full Operational mode, Hand Operational mode, Emergency mode and Fault mode.
Prior to operation the PVED-CC4 performs a Power On Self Test (POST) in order to validate the state of electronics, settings and software.
If the PVED-CC4 recognizes violations of standard operation it will immediately give a detailed feedback on this event. If the violation is regarded as possibly dangerous the PVED-CC4 will enter fault mode.
The PVED-CC4 is a mechatronic device, meaning mechanics, hydraulics, electronics and micro-controller interacting with external systems.
The illustration below gives an overview of the actuator tasks. On the left side is external system interaction on the right side internal tasks.
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PVED-CC4 functionality
PVED-CC4 mechatronical interaction

Mechanical sub-system

Housing

The housing of this product protects the internal parts from the environment and gives by design the optimal interface to cabling, Pilot pressure and spool.

PVED-CC4 Cable kit

The cabling is one of the great advantages for CAN systems. It reduces the number of cables and gives a simpler system overview.
All units (ECU e.g. PVED) are connected by the CAN bus, a CAN high and a CAN low wire which are terminated at the ends. Power and ground wires can with respect to maximum current consumption follow the bus wires.
The bus can either be made as a daisy chain, where the stub from bus to ECU is inside the PVED
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ECU
1
ECU
n
ECU
4
ECU
3
ECU
2
120 Ω termination
P301 361
ECU
1
ECU
n
ECU
4
ECU
3
ECU
2
P301 362
8±0.5Nm [70±4.5lbf-in] 5[0.20]
8±0.5Nm [70±4.5lbf-in] 5[0.20]
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PVED-CC4 functionality
or with stubs going from the back bone to the ECU.
PVED-CC4 with AMP connector exploded view
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Both solutions have advantages and disadvantages. Danfoss supports the daisy chain solution with cables but the PVED-CC4 could easily be used with the back bone solution.

PVED-CC4 mounting

The Danfoss PVG concept is based on parts interchangeability. This is also valid for the PVED-CC4 and makes field retrofitting possible. PVED can be mounted on both ends of PVB.
PVED-CC4 with DEUTSCH connector exploded view
W
W
W
User Manual
PVED-CC4 functionality

Hydraulic subsystem

Warning
Deviation from recommended torque can harm performance and module.

Linear Variable Differential Transducer (LVDT)

The Linear Variable Differential Transducer (LVDT) or position sensor is the interface between the mechanical system (spool) and the electronic system.
Warning
The LVDT must never be mechanically adjusted, bent, damaged or partially blocked as this will lead to incorrect information on spool position.

Spool neutral spring

The PVBS neutral spring is an important safety component as it keeps or moves the PVBS in blocked position when solenoid valves are disabled. The spring will keep the A and B port.
The hydraulic subsystem is used for moving the spool and thereby opening the valve for work flow.
Pilot oil diagram
The heart of the hydraulic subsystem is the solenoid valve bridge. It consist of four poppet valves, the two upper ones are normally closed (NC-S) with a small bleed, the two lower ones are normally open (NO).
A continuous modulation of solenoid valves NC1 and NO4 together with a simultaneous energization of NO2 and de-energization of NC3 causes the main spool to move to the right direction and vice versa. When the main spool is stroked to the far right, a simultaneous energization of both NO2 and NO4 and de-energization of both NC1 and NC3 balances the main spool in its stroked position. An emergency stop activated when the spool is stroked will cause all solenoid valves to de-energize causing the main spool to move back to its neutral position by means of the main spool neutral spring and the hydraulic principle.
The Pp will work against the PVBS neutral spring when the spool is moved out of blocked (neutral) and together with the spring when going in blocked. This combined with a larger opening in the NO than in the NC-S will give a faster movement towards blocked than out of blocked.
Warning
Obstacles for the Pp can have direct influence on spool control. Reduced pilot pressure will limit spool control. Too high Pp can harm the system.
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W
POST
Device state
machine
DSM
Full
Operational
mode
Emergency
mode
Fault
mode
Hand
Operational
mode
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PVED-CC4 functionality

Computerized sub-system

The PVED-CC4 operation is based on state machines. The top level is according to this figure. Details are available in the data section of this Technical Information.
Warning
Depending on PVED-CC4 variant, age and software there are variations in communication and control. Read this technical information before implementing new PVED-CC4 in applications.
DSM for PVED-CC4
Transition out of POST (Power On Self Test) is controlled by PVED-CC4
•
Transition in and out of fault mode is controlled by PVED-CC4
•
Transition between Full Operational Mode, Hand Operational Mode and Emergency Mode is
•
controlled by operator.

Power On Self Test (POST)

When power is applied to the PVED-CC4 it will initialize components and validate component states and parameter settings. If test is passed the PVED will enter Full Operational mode otherwise it will enter Fault mode. In both cases it will, if possible, make itself known to the network by an address claim followed by if needed a fault message (DM1) and then Auxiliary Valve Estimated Flow message (AVEF).

PVED-CC4 full operational mode overview

In full operational mode the PVED-CC4 controls the spool based on Auxiliary Valves Commands (AVC) from system master. This mode is characterized by:
No fault is present
•
Full control by CAN bus of PVED
•
Fault monitoring is active
•
Auxiliary Valve Estimated Flow message (AVEF) is transmitted
•

PVED-CC4 hand operational mode overview

Hand operational mode is used when the PVG module should be operated manually without the PVED going into failure mode.
In hand operational mode the PVED-CC4 cannot control the spool. This mode is characterized by:
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PVED-CC4 functionality
No fault is present.
•
Spool control by PVED is disabled.
•
Fault monitoring on spool behavior is disabled. Is maintained on other parameters.
•
Auxiliary Valve Estimated Flow message (AVEF) is transmitted
•

Emergency mode

Emergency mode is similar to Hand operational mode but is entered without any ramping. This mode is characterized by:
Entered without any delay
•
Similar to hand operational mode
•

Fault mode overview

In fault mode the PVED-CC4 monitors and reports if possible. This mode is characterized by:
One or more faults are present
•
LED is yellow or red
•
PVED tries to force PVBS to blocked position
•
AVC from Master is not followed by the module
•
Fault monitoring is active and every second present faults are reported
•
Auxiliary Valve Estimated Flow message (AVEF) is transmitted.
•

Settings and system data

The PVED-CC4 offers a number of settings for both spool control, fault monitoring and general system settings. A number of system information parameters are available via the service tool. Details are available in the data section of this Technical Information.

PVED-CC4 Process data

Process data can be considered as user or situation specific values. They are the runtime settings Ramp timing, scaling of set point, variation of progressivity and port inversion and can be changed during operation by an ISOBUS message.

OEM data

OEM data can be considered as application or system specific values. They are a number of safety settings, performance settings and the module communication identifier. Also a set of fall back values for the process data are stored as OEM data.

Spool data

Spool data are parameters used for linearization of the spool. These parameters gives relation between spool position and flow command in order to comply with the ISOBUS standard of 0.4% flow change for each step of the Auxiliary Valve Command (AVC).

General part details

Information like part number, production date, software identification and Name field are also available.
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Memory organization
Locked
Process
Data
Active
Parameters
AVC
Process
Data
Spool Data
Basic
Parameters
Fault
Monitoring
General
Settings
(excl node)
Error Log
basic
Temperature
Log
Process
Data in OEM
Calibration
data
Backup
Parameters
Node Id General
Settings
Error Log
general
Naming
Node ID
Spool / Flow
table
Fault
Monitoring
General
Settings
(excl node)
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PVED-CC4 functionality

PVED-CC4 Logging

An error log with event counter is stored in the EEPROM. During runtime a temperature histogram for the electronics are stored in the EEPROM.
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PVED-CC4 safety description

Definition

Concept

For a general description on Safety in Application please see PVG 32 Technical Information BC152886483664.
The Danfoss definition of safe state transition by fault: Depower solenoids and release spool to neutral spring. PVBS to be forced to blocked position (neutral) by neutral spring.
The PVED-CC4 has Active Fault Reaction, meaning the solenoids are disabled on fault. Less flow than commanded is not regarded as dangerous by the PVED.
The PVED-CC4 safety concept is based on two elements:

POST – Power On Self Test

•
Runtime fault monitoring and reaction
•
The basic elements for product safety are:
Continuous module self monitoring
•
Fault recognition and reaction
•
Fault reporting and recording
•
Fault recovery
•
POST–Power On Self Test
When powered the PVED evaluates settings, circuit, sensors and spool interface . Passing of the POST is a precondition for entering Full Operational Mode.

PVED-CC4 runtime fault monitoring

After power on set up and POST the runtime fault monitoring takes over. Every time the uCSM enters the safety task a number of feedbacks are evaluated. In parallel the internal handshake between microcontroller and watch dog is running. The faults are categorized by origin and severity level

Fault origin category

Internal PVED
•
‒ ‒ ‒ ‒ ‒
PVED PVG interaction
•
‒
System interaction /communication fault
•
‒ ‒ ‒ ‒
Handshake fault Calculation faults Memory faults Components faults Temperature fault
Spool position faults
Power supply Invalid commands Missing commands CAN bus faults
22 | © Danfoss | February 2021 BC368572537192en-000101
User Manual
PVED-CC4 safety description

PVED-CC4 fault Reaction

Fault severity level

Warning. A changes of settings was attempted but could not be followed
•
Severe. Based on the present state actuation cannot be continued. This is for fault types permanent
•
and temporary.
In case of recognized unintended behavior the PVED-CC4 can react in three ways. For some events the reaction is at first occurrence for others after a threshold is passed. By multiple faults the most severe has priority and the PVED-CC4 will stay in fault mode until recovered
from all faults.

Recorded and reported solenoid disabling

Used by severity level Severe and solenoids are disabled. If the event is regarded safety or performance threatening the solenoids are disabled (spool forced back
to blocked), a distress messages is broadcasted on the CAN bus at occurrence and for as long as present and a record is made in the error log.

PVED-CC4 fault recovery

Recorded and reported ignorance

Used by severity level Warning and solenoids are not disabled. A distress messages is broadcasted on the CAN bus at occurrence and as long as present and a record is
made in the error log.

Unrecorded reaction

By missing handshake from microcontroller the Watch dog disables the solenoids and the CAN bus interface.
For events of severity level Severe there are one of two ways of recovery.

Reboot

The event is regarded as system threatening and a system reconfiguration and reevaluation is required.

Resume

The event is regarded as performance/safety threatening but not system threatening. When the fault trigger disappears transmission of two AVC Blocked reactivates the PVED.
For events with severity level Warning no recovery needed. The operator might though need to send a valid setting changes to get a desired performance.
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Danfoss | February 2021 BC368572537192en-000101 | 23
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