Xylem WTW DIQ/S 281, Руководство по эксплуатации

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Outputs DIQ/S 281
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6.6.2 System monitoring
Function The
System monitoring
function enables the monitoring of system errors. In
order to set up the
System monitoring
function for a relay output, the relay output
must not be linked with a sensor (see section 6.4).
It can be used to monitor the following system errors.
Settings
Collective error
message
In the case of a
Collective error
message, the relay opens if one of the following
malfunctions occurs:
 The sensor, which is properly registered to the DIQ/S 281, does not provide
a valid main measured value
 The sensor, which is properly registered to the DIQ/S 281, does not provide
a valid secondary measured value
 The internal output module has not received any new data DIQ/S 281 for 2
minutes.
In any case, the relay remains open for 10 seconds and only closes when the
malfunction is no longer present.
In the following cases, the relay does not open despite an invalid measured
value:
 The sensor is being calibrated
 The sensor is in the maintenance condition
 The sensor is being cleaned with the aid of a valve module in the system
(compressed air operated cleaning system).
Settings Selection Explanations
Power failure On
Off
The
Power failure On
function monitors the
supply voltage of the DIQ/S 281. If the voltage
falls below the critical value, the relay switches.
Communication On
Off
The
Communication On
function monitors the
functioning of the DIQ/S 281.
Collective
error message On
Off Collective error message On
function
simultaneously monitors the proper functioning
of all sensors and the functioning of the
combination output module to be monitored.
(for details, see below this table)
Action Open
For all functions of the
System monitoring
, the
relay action is set to
Open
.