Materials; Temperature Display, Control And Safety Circuit - Lauda Proline RP 845 C Operating Instructions Manual

Proline Edition X cooling thermostats
For operation as a circulating thermostat with an external load, a higher power level is practicable to
maintain the temperature difference low, among other things also with higher temperatures in
conjunction with oils as heat transfer liquid.
The pump connections on the unit are fitted with M16 x 1 thread.
Pump characteristics ( Section 11).
The pump outflows of the Varioflex pump can be closed off without any impairment to the pump. Here,
the "internal" setting of the bypass controller is recommended.
4.4

Materials

All parts being exposed to the heat transfer liquid are made of high quality material appropriate to the
operating temperature. Non-rusting stainless steel and high quality temperature-resistant, primarily
solvent-resistant plastics are used.
4.5

Temperature display, control and safety circuit

In the Master Version, the units are equipped with a 5-character green LED display, which is used for the
display of the measurements and settings, as well as the operating status. The entry of setpoints and
other settings occurs under menu guidance via four keys.
The extra features of the Command Version include a removable console with a backlit graphical
display. The entry of the setpoint and other settings occurs under menu guidance via situation-
dependent cursor keys and soft keys.
A Pt100 temperature probe acquires the outflow temperature in the bath. A high-resolution A/D converter
processes the measurement. Further measurement conditioning occurs using a special control algorithm
for controlling the heater actuator, which has a low reactive effect on the mains, and the SmartCool
refrigeration equipment together with further transducers.
An external Pt100 can be connected via a socket (10S) for the acquisition of an external temperature.
This value can be displayed and, if required, used as the controlled variable with external control
(Master) switched on. In this way, the system controls the external measurement and not the outflow
temperature ( 7.7.4).
The safety system conforms to DIN EN 61010-2-010. The SelfCheck Assistant monitors about 50 unit
parameters. A dual-channel system is used in which two microcontrollers monitor one another. Along
with the bath temperature measurement and control probes, there are also two safety temperature
probes (Pt100) for the safety circuit for the overtemperature cut-off and for monitoring the bath
temperature probe.
The overtemperature cut-off point is displayed on pressing the key
Changing the overtemperature cut-off point: ( 7.2 Switching on) on page 26.
The bath level is acquired by the SelfCheck Assistant in 8 stages. A permanent display is provided only
with the Command remote control. If the minimum level is undercut, the pump, heater and the
SmartCool System refrigerating machine are switched off. The reaction of the thermostat in case of
overfill can be set to simply display a warning, to display a warning and switch off the heater or to switch
off the unit completely with pump, heater and SmartCool System refrigerating machine.
When the level is too low, with overtemperature, or with other alarms the SelfCheck Assistant switches
the heater off on all poles. The pump and the refrigerating machine are also switched off.
This switch-off under fault conditions is retained, i.e. after the fault is rectified, the fault must be reset
(released) on the Master operating panel with the
Other unit functions are described in the appropriate sections and in Section 7. (Starting up).
YACE0100/ October 4, 2018
key.
Unit description
on the Master.
17