Ollo Lower Working Range Limit (Only With Rwf40.0X2B97); Olhi Upper Working Range Limit (Only With Rwf40.0X2B97); Dtt Bus Watchdog Timer For Remote Operation (Only With Rwf40.0X2B97) - Siemens RWF40.000A97 User Manual

8.3.12 «oLLo» lower working range limit (only with RWF40.0X2B97)
Example
Example
8.3.13 «oLHi» upper working range limit (only with RWF40.0X2B97)
Example
Example
8.3.14 «dtt» bus watchdog timer for remote operation (only with RWF40.0X2B97)
HVAC Products
The lower working range limit limits the control range in the downward direction. This
limitation is independent of the setpoint adjustment and hysteresis 1. If switch-on
threshold «SP + Hyst1 < oLLo» falls below the lower working range limit, the switch-on
threshold will be replaced by the lower working range limit. The setpoint does not
change.
SP = 59
ð
Switch-on threshold = 55
Current setpoint = 59
If the setpoint lies below the lower working range limit, the setpoint and switch-on
threshold will be replaced by the lower working range limit.
SP = 54
ð
Switch-on threshold = 55
Current setpoint = 55
As soon as supervision of the working range starts, «oL» and the current setpoint will
flash alternately.
Value range: -1999...+9999 digit
Factory setting: -1999 digit
The upper working range limit limits the control range in the upward direction. This
limitation is independent of the adjustment of the setpoint and hysteresis 3. If switch-off
threshold «SP + Hyst3 > oLHi» exceeds the upper working range limit, the switch-off
threshold will be replaced by the upper working range limit. The setpoint does not
change.
SP = 90
ð
Switch-off threshold = 93
Current setpoint = 90
If the setpoint lies above the upper working range limit, the setpoint and switch-off
threshold will be replaced by the upper working range limit.
SP = 95
ð
Switch-off threshold = 93
Current setpoint = 93
Value range: -1999...+9999 digit
Factory setting: 9999 digit
In remote operation, bus communication is monitored (refer to User Documentation
CC1A7865.1en RWF40... interface RS-485). Within the setting, communication with the
management system must take place. If that is not the case, the RWF40... will
automatically change from remote operation to local operation (operation like
RWF40.0X0... and RWF40.0X1...).
Value range: 0...7200 s
Factory setting: 30 s
Exception: 0 = watchdog timer function deactivated
CC1B7865en
Hyst1 = -5
Hyst1 = -5
Hyst3 = +5
Hyst3 = +5
05.12.2002
8. Configuration
oLLo = 55
oLLo = 55
oLHi = 93
oLHi = 93
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