35
ESD / Partial
Stroke Settings
9.5
The EH actuators have two separate
ESD circuits, a software driven circuit
and hardware driven circuit.
The software ESD function has three
settings in this menu that can be
adjusted
[EA]
Software ESD Action,
[EO]
ESD Local Stop Override and
[EC]
ESD Contact Type.
The hardware ESD circuit does not rely
on the software to initiate an active
ESD signal (although the software does
monitor the ESD line).
For normal operation, there must be
an ESD signal present on the actuator.
Once the ESD signal is removed all
power to the solenoid valves will also
be removed instantaneously regardless
of any other command or setting.
There is a physical link on the Power
PCB, which is used to switch between
the two. By default the actuator will be
supplied set for software ESD control
unless ordered for hardware ESD.
Consult the factory for changing this
link.
ESD Action
De-Energise
ESD Action (Software)
EA
An active ESD signal applied to the
actuator will override any existing or
applied local or remote control signal.
Press the
+
or
-
key to select the
required ESD action:
[ E]
De-Energise (Default):
This option
will de-energise all the solenoid valves.
[ C]
Close:
This option will perform a
Close command.
[ O]
Open:
This option will perform a
Open command.
[IP]
Stay Put:
This option will perform a
Stop command.
To change the ESD action press the
+
or
-
key until the required setting is
displayed.
PRESS THE
KEY.
The displayed option will flash (stored)
indicating that it has been set.
Under Pressure
Hysteresis
Position
Hysteresis
0.5%
This feature will increase the internal
hydraulic pressure in the actuator if it
falls to a set defined value while the
actuator is at position limit, for example
due to thermal contraction.
The default value is 10% below the
value set in
[CP]
Close Pressure (Limit)
and
[OP]
Open Pressure (Limit)
.
The minimum settable value is 1% and
the maximum settable value is 99%.
To change this value press the
+
or
-
keys to increase or decrease the set
value.
PRESS THE
m
KEY
The displayed value will flash indicating
that it has been set.
UH
Under Pressure
Hysteresis
10%
