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OPERATION
Series 655
78/112
Edition 23.09.2019
979645EA
5.6.2
Operation
Control Mode
Digit 1
Digit 2
Digit 3
Digit 4
Init (start up)
I
n.
-
-
Init (start up, leak tight)
I
n.
-
C
Close
C.
C, 0…100
valve position
Open
O.
Pressure control
P.
Position control
A.
C
0
100
= closed, leak tight
= minimal conductance
= maximum opened
Interlock
Valve closed or open by digital input
I.
Hold (position frozen)
H.
Learn
L.
Safety.
Refer to «Safety mode» for details.
S.
Power failure
F.
5.6.3
Error
Description
Digit 1
Digit 2
Digit 3
Digit 4
Error number (xyz)
E.
x
y
z
alternately (if error code exist)
Error code
-
u
v
w
For Error number / code. Refer to «Trouble shooting» for details
5.7
Safety mode
By means of an external switch (see connection diagrams «Electrical connection») the motor power
supply can be interrupted. In this case the valve enters the ‘safety mode’. This motor interlock prevents
the valve from moving (e.g. maintenance work). Data reading from the control unit remains possible.
When motor interlock is active during power up the valve directly enters the ‘safety mode’ and is not able
to do homing. Display shows ‘S.XXX’ (XXX = value position of valve or C..C for close). In this case
homing cycle will be done when motor interlock is deactivated. Then Display shows ‘Ho’ (Homing) for a
moment followed by ‘A. 0’
When ‘safety mode’ is entered from operation (i.e. pressure control mode), the unit will automatically
switch to position control mode and remain at current position. Once motor interlock is deactivated the
unit remains in position control mode.