Industrial Scientific Oldham MX52, Commissioning, Operating And Maintenance Manual

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22
BLOCK DIAGRAM 3
PARKING CYCLE
Alarm 3 operates in the same way as the normal cycle.
The times defined for alarms 1 and 2 (time delays) are, in this case, used to define the minimum
operating time for each relay.
t AL1 tR1 R2 t AL2
Threshold AL2
Threshold AL1
Starting of
relay R1
Stopping
of relay R1
Starting of
relay R2
Stopping of
relay R2
min.
t
AL1
Min. operating time for alarm 1
(defined for each channel) t
1
t
AL2
Min. operating time for alarm 2
(defined for each channel) t
2
t
R1 R2
Switching time from relay 1 to relay 2
(defined for the whole unit) t
R1 & R2