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8.4.9
Precommand checkback signal
You can configure a "Precommand checkback signal" for each motor block in
addition to the precommand. The "Precommand checkback signal" provides
information on if the precommand was implemented (e.g. via valve
or
damper end
position switch). Only then is the motor switched on.
Main menu > Commissioning > Extra configuration > Aggregates > Motor > Motor 1...6 >
Configuration
Operating line
Range
Factory setting
Precommand checkback
signal
---, N.X1, N.X2,...
(digital inputs only).
---
A fault message is displayed and the motor does not start if no "Precommand
runup time" is issued within the set "Precommand checkback signal". Precommand
"Off" is issued after the "Precommand rundown time".
If the "Precommand checkback signal" drops off during motor operation, the motor
is switched off immediately and precommand "Off" is issued after expiration of
"Precommand rundown time". A fault message is displayed. The fault message is
removed only after acknowledgement and reset.
Using the "Precommand checkback signal" is sensible only if combined with the
configured precommand.
Note
PcmdRnup
PcmdRnup
PcmdRndw
PcmdRnup
PcmdRndw
PcmdRndw
Fault message
acknowledged
+ reset
Normal operation
Precommand
checkback signal
missing
Precommand
checkback signal
lost during operation
Motor B
Off
Motor A
Motor
operating state
Start-
condition
On
Off
On
Precommand
Motor fault
Precommand
checkback
Off
On
Off
On
Off
On
31
23
D
0
7
e
n
Function diagram
based on
1-speed motor
PcmdRnup = Precommand runup time
Key
PcmdRndw = Precommand rundown time
118 / 216
Siemens
Switching and monitoring device RMS705B
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01.04.2010