Safety Mode; Operation Under Increased Temperature; Behavior During Power Up - VAT 650 Series Installation, Operating, & Maintenance Instructions

3.1.3 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.
3.2

Operation under increased temperature

Hot valve
Heated valve may result in minor or moderate injury.
Do not touch valve and heating device during operation. Once heating is switched off
(valve and system) await until the valve is cooled down complete before doing any work.
This valve may be operated in the temperature range mentioned in chapter «Technical data».
3.3

Behavior during power up

Valve position before
power up:
Closed (isolated)
All other than closed (not isolated)
Refer also to chapter «Display information».
VAT Vakuumventile AG, CH-9469 Haag, Switzerland
Tel +41 81 771 61 61 Fax +41 81 771 48 30 CH@vatvalve.com www.vatvalve.com
Installation, Operating & Maintenance Instructions
Series 650 DN 100-250 (I.D. 4" - 10"), DeviceNet
Reaction of valve:
Valve power up configuration = closed
(default)
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 limit stop for synchronization.
Display shows configuration of product resp. „SYNC‟ until synchronization is
done.
Valve position after power up is closed
Valve power up configuration = open
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.
Valve position after power up is open
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