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3-22
Protection Functions
Note: The relay A1 has been configured to
be "normal closed". The start is just an
alarm telling that there is only one start left
at the moment.
857-UM001A-EN-P – July 2009
+
-
STOP
Open
coil
VAMP relay
Output matrix
I> start
I> trip
N> alarm
N> motor start inhibit
Figure 3.14 – Application for preventing too frequent starting, using the N> stage
Table 3.14 – Parameters of the frequent start protection: N> (66)
Parameter
Measured
Mot strs
value
T
Setting values
Sts/h
Interval
Recorded
SCntr
values
TCntr
Descr
Tot Mot Strs
Mot Strs/h
El. Time from
mot Strt
-
Close
coil
M
+
T1
A1
Value/unit
Motor starts in last hour
Min
Elapsed time from motor start
Max. starts in one hour
Min
Min. interval between two consecutive
starts
Start counter (Start) reading
Trip counter (Trip) reading
1StartLeft
1 start left, activates the N> start signal
MaxStarts
Max. start trip, activates the N> trip
signal
Interval
Min. interval between two consecutive
starts has not yet been elapsed,
activates the N> trip signal
Number of total motor starts
Number of motor starts in last hour
Min
Elapsed time from the last motor start
+
START
NStageAppl_40
Description
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