Danfoss PVG 120 Service Manual page 11

Service Manual
Safety in application
PVG 120 Proportional Valve Group
Example of fault monitoring for deactivation of the hydraulic system with extra fault inputs using the PVE's
with DI (Direction Indication) function.
Emergency
Stop
PVE 1
Neutral detection / Supply control
signal
≠
neutral
2)
DI-B
DI-A DI
Logic
U
S
PVE 2
Neutral detection / Supply control
signal
≠
neutral
2)
DI-B
DI-A DI
Logic
U
S
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 conformity with the relevant machine directives.
520L0247 • Rev JA • May 2014
Man present
switch
1)
OFF
Delay
Fault detection
3)
4)
Output
Delay Memory
1)
OFF
Delay
Fault detection
3)
4)
Output
Delay Memory
Fault detection output
PVEH-DI
AMP supply
connector
U
S
U
DC2
Error
PVEH-DI
AMP connector
DI-A
DI-B
Error
PVEH-DI
AMP supply
connector
U
S
U
DC2
Error
PVEH-DI
AMP connector
DI-A
Error
high=on
low=off
Hydraulic
deactivation
P301 319
11