©
2012 Sencon Incorporated
Page 12
BCM500/387 Bodymaker System
Parameter
Symbol
Limits (Degrees of Travel)
The maximum allowable
variation in the SCT time (t
SCT
)
between successive machine
strokes is
±
20%. Make sure
this limit is not exceeded when
the machine accelerates or
decelerates from one speed
setting to another.
Dome Offset
d
DOME
Approximately 2
º
or 1" [25 mm]
(from the end of the punch to the centerline
of the sensor)
Setup Time
t
SU
40
Ε
or 10 msec. (minimum)
SCT Time
t
SCT
18
º
or 5 msec. at 600 CPM (minimum) to
30
º
or 50 msec. at 100 CPM (maximum)
If the t
SCT
time changes by more than
±
20% between successive machine strokes, a tearoff may not be
detected until the trimline check is made.
SYSTEM TIMING DIAGRAMS
System Power Up Timing
The power up diagram only
applies to sensors with the
calibration values saved
internally in EEPROM.
Sensors without this
capability must be
calibrated every time the
supply power is turned on.
Good Run Timing
The maximum cycle time
is 260
°
at 600 CPM for all
three timing windows.
The minimum SCT window
time is 5 msec. or 18
°
at
600 CPM.
The dome jam check
begins at the end of the
SCT window and continues
while either the AST or
BST signals are active.