VAT 642 Series User Manual

OPERATION
Series
642
90/119 Edition 2017-11-24 742280ED
5.2.4 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.
5.2.5 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
be repeated to attempt target position in the short term. But in the medium term the valve unit requires
cleaning or inspection. ‘Service request’ (SR) would be indicated on the display or could be read via
remote operation. Refer to «Display information» for details.
5.3 Operation during power up
Valve position
before
power up:
Reaction of valve:
Valve power up configuration = closed
(default)
Valve power up configuration = open
Closed (isolated) Valve remains closed.
Display shows alternately ‘C C’ and
‘INIT’.
Synchronization will be done when
first movement command is received.
Valve runs to max. throttle position to
detect the limit stops to synchronize.
Display shows configuration of
product resp. ‘SYNC’ until
synchronization is done.
Valve position after power up is open.
All other than closed
(not isolated)
Valve runs to max. throttle position to detect limit stop for synchronization.
Display shows configuration of product resp. ‘SYNC’ until synchronization is
done.
Valve position after power up is
closed
Valve position after power up is open
Refer also to chapter: «Display information».
Valve position
before
power failure:
Reaction of valve:
Without Power Failure Option (PFO)
642 . . - . . G . - . . . .
642 . . - . . A . - . . . .
642 . . - . . T . - . . . .
642 . . - . .
V
. - . . . .
With Power Failure Option (PFO)
642 . . - . . H . - . . . .
642 . . - . . C . - . . . .
642 . . - . . U . - . . . .
642 . . - . .
W
. - . . . .
Any Valve remains at current position. Valve will close or open depending
on valve configuration 1).
Default is not defined.
Display indicates F.
1) Provide that battery pack of the VAT controller is charged. Charging time after power up is 2 minutes
max..

VAT 642 Series Specifications

General

Brand	VAT
Model	642 Series
Category	Control Unit
Language	English