Moog ACV with CANopen bus interface
7 Servo valve functions
Monitoring
B99224-DV018-D-211, Rev. A, October 2018
242
7.15.5.1 Object 0x2421: Upper limit
The parameter <UpperLimit> (0x2421) shows the upper limit of the spool position failsafe monitoring window.
7.15.5.2 Object 0x2422: Lower limit
The parameter <LowerLimit> (0x2422) shows the lower limit of the spool position failsafe monitoring window.
7.15.5.3 Object 0x3307: Spring Position Minimum
This parameter is optional set on request and depends on the valve model number. The parameter holds the
lower limit of the failsafe position. This position will be valve specific calibrated and stored during production.
The expected failsafe position of the valve should be between <SpringPositionMinimum> (0x3307) and
<SpringPositionMaximum> (0x3308).
7.15.5.4 Object 0x3308: Spring Position Maximum
This parameter is optional set on request and depends on the valve model number. The parameter holds the
upper limit of the failsafe position. This position will be valve specific calibrated and stored during production.
The expected failsafe position of the valve should be between <SpringPositionMinimum> (0x3307) and
<SpringPositionMaximum> (0x3308).
7.15.6 Pilot/single stage actual spool position monitoring
In case of a cable break, the fault code 0x11 (Pilot/single stage LVDT cable break) is thrown and the device
state machine state changes to 'NOT READY'.
<StatusWord> (0x6041) (DSM state)
Failsafe spool position monitoring behavior
'INIT'
No failsafe spool position monitoring active.
'DISABLED', 'HOLD', 'ACTIVE',
'FAULT DISABLED', 'FAULT HOLD'
Failsafe spool position monitoring active if one <DigitalOutputType> (0x2420) is
set to 1 (failsafe spool position monitoring on).
ValveFailSafeWindowMonitoring
Index
Sub-index
Parameter name
Data type
Access
Persistence
Value range
Default
0x2421
0
UpperLimit
INT16
ro
-
<LowerLimit>
(0x2422)…32767
16384
ValveFailSafeWindowMonitoring
Index
Sub-index
Parameter name
Data type
Access
Persistence
Value range
Default
0x2422
0
LowerLimit
INT16
ro
-
–32768…
<UpperLimit>
(0x2421)
–16384
SpringPositionMinimum
Index
Sub-index
Parameter name
Data type
Access
Persistence
Value range
Default
0x3307
0
SpringPositionMinimum
INT16
ro
Y
INT16
0
SpringPositionMaximum
Index
Sub-index
Parameter name
Data type
Access
Persistence
Value range
Default
0x3308
0
SpringPositionMaximum
INT16
ro
Y
INT16
0
The servo valve must be serviced by Moog service technicians.
The servo valve may behave unpredictably.
