VAT 651 Series - Service Indication; Operation during Power Up; Behavior in case of Power Failure

Series 651 OPERATION
605451EC Edition 2014-07-10 69/
99
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
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.
5.7 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».
5.8 Behavior in case of power failure
Valve position
before
power failure:
Reaction of valve:
Without Power Failure Option (PFO)
651 . . - . . G . - . . . .
651 . . - . . A . - . . . .
651 . . - . . T . - . . . .
651 . . - . .
V
. - . . . .
With Power Failure Option (PFO)
651 . . - . . H . - . . . .
651 . . - . . C . - . . . .
651 . . - . . U . - . . . .
651 . . - . .
W
. - . . . .
Closed (isolated) Valve remains closed. Valve will close or open depending
on valve configuration 1).
Default is not defined.
Display indicates F.
Valve open or in any
intermediate position
Sealing ring moves down and blocks
the pendulum plate at the current
position.
1) Provide that battery pack of the VAT controller is charged. Charging time after power up is 2 minutes
max..
All parameters are stored in a power fail save memory.