Siemens Synco 700 RMZ785 - Page 117

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 lin
e Range Factor
y 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
3123D07en
Functio
n diagram
based on
1-spee
d motor
PcmdRnup = Precommand runup time
Key
PcmdRndw = Precommand
rundown time
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Siemens Switching and monitoring device RMS705B CE1P3124en
Building Technologies Aggregates 01.04.2010