Walther WTRB-24DC-3500 Operating Manual page 15

Rev. 1.0
5.3.2 Limit Monitoring
One alarm output for excess and one alarm output for insufficient temperature have been pre-configured. They
were set at ± 1 [°C] from the currently set desired value (SP1). In order to prevent malfunctions from broken
cables, a permanent signal is transferred to the superordinate control unit. If the preset value at the WTR is
exceeded or fallen short by 1°C, the individual alarm output drops as a signal for the superordinate control unit
(Signal at LOW). The alarm signal is turned off (Signal at HIGH) once the set value range has been reached
again. If the currently measured, actual temperature is within the preset tolerance range of ± 1 [°C], HIGH will
be indicated for both alarm outputs.
The hysteresis (HySt) for error signal is factory-set at ±1 [°C] symmetrically to the limit value of the insufficient
temperature (UT) or excess temperature (OT). If the temperature rises or falls back into these limits, the respec-
tive signal will be given. Please refer to Figure 5 for the signal curves of the two alarm outlets of the WTR-x.
Signal at alarm output 1
Used for issuing an error signal
for insufficient temperature (devi-
ation AL -1°C to set value SP1)
Signal at alarm output 2
Used for issuing an error signal
for excess temperature (deviation
AL +1°C to set value SP1)
Figure 5: Signal curves of the alarm outlets of the WTR-x.
WALTHER Temperature Controller Bundle WTRB-x-x
1
0
1
0
AL
HySt
UT
SP1
AL
OT
SP1
Walther Systemtechnik GmbH – D 76726 Germersheim
Telefon: +49 (0)7274-7022-0 Telefax: +49 (0)7274-7022-91
http://www.walther-2000.de – info@walther-2000.de
Page 15 of 42
Temp.
HySt
Temp.