Flowserve LRR1-40 TDS Control Unit - Manual (Page 9)

9
Explanatory Notes
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Function
The conductivity electrode LRG 1- 40 sends at regular intervals data telegrams via CAN
bus to the control unit LRR 1- 40.
The data telegram of the conductivity electrode LRG 16- 40 contains the following data:
■ Conductivity reading (actual value X), based on 25°C
■ Temperature of boiler water,
■ Alarm: Internal cable monitoring signals malfunction(s),
■ Alarm: Temperature sensor for boiler water is defective,
■ Alarm: Excessively high temperature in terminal box.
All transmitted process data are continuously evaluated by the control unit and assigned
to the control range and the respective switch points.
If the associated conductivity electrode interrupts the data transmitting cycle, an alarm
message is given and a visual signal is indicated by the display of the operating device.
Use operating device URB or SPECTOR control to configure, parameterize, operate and
show the available parameters of the conductivity electrode. The control unit LRR 1-40
can only test the energizing/de-energizing of the relays for the limit values.
The control unit features the following functions:
■ Use as 2-position controller for the control of a continuous blowdown valve,
■ Use as 3-position proportional stepping controller for the control of a continuous
blowdown valve with feedback potentiometer,
■ Triggering of daily purging pulse (24h) to actuate the continuous blowdown valve,
■ De-activation of control function during stand-by operation of steam boiler,
■ Alarm signal in the event of a malfunction in the conductivity electrode,
■ Max. limit alarm for conductivity limiting,
■ Min. limit alarm or
■ Automatic blowdown control with timed actuation of the intermittent blowdown valve,
■ Analog actual value output (4- 20 mA) for external conductivity indication (optional).