JUMO 902931 Wtrans Receiver with Wireless Data Transmission Operating Manual - Manual (Page 76)

9 Term definition
76
Upper/lower drag indicator (xx.Min) and upper drag indicator (xx.MAX)
The minimum and maximum values for each channel are saved and shown on the display
when requested. In this context, overrange and underrange are not taken into account. These
values can be reset using the keypad or interface. Once the drag indicator has been reset, the
current value is adopted and the drag indicator function restarts.

Chapter 8.2.3 "Channel-specific parameters", page 62
 Chapter 10 "Displaying and resetting a drag indicator", page 77
Figure 33: Chronological sequence of drag indicator functions
Figure 33 shows the chronological sequence of the lower (xx.Min) and upper (xx.MAX) drag
indicator functions. The value Max.1 is saved in the first positive half-wave of the actual value
curve, value Min.1 is saved in the first negative half-wave. The keypad can be used to reset
these values; in the example this occurs at t
Reset
.
Once the drag indicator has been reset, the current value is adopted (Max.2 = Min.2). The drag
indicator function restarts. The next saved values are Max.3 and Min.3.
CAUTION!
Alarm in the event of probe break or probe short circuit:
Even probe break (display "oooo") or probe short circuit (display "uuuu") values – which indi-
cate a definite fault – only lead to an alarm bit being set and consequently to a collective alarm
with a red flashing LED if at least one alarm (either LoAL or HiAL) has been configured.
If you only wish to receive a probe break/probe short circuit alarm and do not require any limit
value monitoring, activate an alarm using a limit value outside of the range of occurring actual
values.
Example:
Your actual value may be between -10 and +200 °C.
Pure probe break/probe short circuit alarms can be achieved, for example, using a HiAL con-
figuration with a limit value of 300 °C or a LoAL configuration with a limit value of -100 °C.