wtw CL 298, Руководство по эксплуатации

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Outputs
pH 298, LF 298, Oxi 298, Cl 298
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( Start value ), the turn-on duration (t
On
) is short, i.e. the relay operated for a
shorter period of time.
5.1.4 PID controller as analog controller ( current 0/4 ... 20 mA)
The analog controller is linked with the 2 current outputs (see characteristic
curve). After the sample rate has expired, the controller is recalculated and the
resulting current is provided at the output. The current remains constant for the
duration of the sample rate.
If the PID controller is configured as an analog controller, the analog outputs are
automatically switched to current outputs by the software.
Observe the correct instrument coding (jumper)!
5.2 Configuring the relay outputs
5.2.1 Relay action
The relay action (opening or closing) is determined with the wiring on the termi-
nal for each relay.
Preferably set up the relay output for monitoring functions as normally closed.
Details on how to connect instruments to the relays (see section
3.8 C
ONNECTIONS
(
RELAYS
,
CURRENT OUTPUTS
, M
ODBUS
)).
5.2.2 Setting up the PID controller
A PID controller that is switched on has exclusive access to the relays or
outputs, depending on the configuration. For relay functions (limiting value
signal or timer) to be carried out, the
PID controller has to be switched off
( release
/
off
)
or configured as an analog controller ( type of the controller
/
current
)
.
If the duration of the close or open pulse is shorter than 0.1 s, the
relay remains open or closed for the complete cycle time.
Settings Explanations
Open The relay should open with every event.
Close The relay should close with every event.
1 Open the configuration menu with <CONF> .