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5.6.2
Operation
Description / Mode
PRESSURE CONTROL mode
POSITION CONTROL mode
Valve closed
Valve open
Closed / open interlock
(Valve closed / open
by digital input)
HOLD (position frozen) activated
ZERO running
LEARN running
Safety mode established. Refer
to «Safety mode» for details.
Power failure
1)
Service request
(valve requires
cleaning)
1)
If SR is blinking alternatively with the actual mode display (e.g. P.11
cleaning.
5.6.3
Fatal error
Description
Fatal error occurred
5.6.4
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 synchronize. Display shows 'D C' or 'D999'. In this case synchronization cycle will be done when
motor interlock is deactivated. Then Display shows 'INIT' for a moment followed by 'SYNC'.
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.
5.6.5
Service indication
This product is able to indicate that the valve unit needs to be cleaned, or an obstruction is present.
A service request is indicated when the control unit detects that motor steps are apparently not effective.
This may happen when the valve unit is heavily contaminated. These ‚lost' steps are recognized and will
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OPERATION
Digit 1
P
V
C
O
I
H
Z
L
D
F
RxD / TxD activity of RS232 communication is displayed by 2 blinking dots in digit 2.
The lower dot indicates RxD activity where the upper dot indicates TxD activity. The
indication is not real time.
Digit 1
E
Edition 2013-04-12
Digit 2
Digit 3
0...100
= valve position (%, 0 = closed / 100 = open)
S
Digit 2
Digit 3
Error code. Refer to «Trouble shooting» for details
Series 612
Digit 4
R
..SR) the valve requires
Digit 4
601894EA
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