Safety Mode; Service Indication - VAT 642 Series Installation And Operating Instructions Manual

Series 642
RUN LED (1)
State
Off
Green
Red
ERR LED (3)
State
Off
Red
Red, flickering
Red, flashing
5.6.5

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.
5.6.6

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.
813316EB
OPERATION
Meaning
No network participation, timeout status (no power)
Participating, normal operation
Major fault (FATAL error)
Meaning
No error detected (no power)
Major fault (Exception or FATAL event)
CRC error (temporary flickering)
Station Number or Baud rate has changed since startup (flashing)
Edition 2017-11-24 79/107