
Parker Hannifin Corporation
Cylinder Division
Des Plaines, Illinois
www.parker.com
/cylinder
Hydraulic and Electrohydraulic Actuators
HAS Series Analog Drives Manual
Catalog HY08-4005-M3
58
WARNING:
This product can expose you to chemicals including
Lead and Lead Compounds
which are known to the State of
California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov
PROP 65 WARNING
Safe Torque Off
Hybrid Actuation System
Cylinders SSeerriieess H
HAASS 550000
Catalog HY08-
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Cylinder Division
Des Plaines, Illinois
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In ideal operation, both inputs X11/01 and X11/03
should change state simultaneously reflecting true
dual-channel operation as intended.
1
2
Both inputs are low. STO prevents the drive from starting. User output is
ON. This is the “safe torque off” state of the drive.
Both inputs are high. Drive is able to run under software control. User
output is OFF.
Channel A: X11/01
Channel B: X11/03
Output: X11/05, X11/06
24V
0V
24V
0V
ON
OFF
1
2
1
N
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Oppeerraattiioonn
In normal operation, there can be a small time difference
between changes of state on X11/01 and X11/03, due to
different delays in the operation of two sets of relay contacts.
States:
1
2
3
Both inputs are low. STO prevents the drive from starting. User output is ON. This is
the “safe torque off” state of the drive.
Both inputs are high. Drive is able to run under software control. User output is OFF.
One input is high and the other input is low. Drive cannot start due to STO action.
User output is OFF. Normal operation allows this state to persist for up to 1.6
seconds which is the minimum fault detection time required to generate a fault (3.0
seconds is the maximum). These tolerable time differences are normally caused by
switches or relays; they should be kept as short as possible.
Channel A: X11/01
Channel B: X11/03
Output: X11/05, X11/06
STATE
24V
0V
24V
0V
ON
OFF
1
2
1
3
< 1.6s
3
< 1.6s
STATE
STO Input Timing Diagrams
Ideal Operation
Normal Operation