Nexen TC920V 964356 - Manual (Page 24)

21 FORM NO. L21268-C-1013
6. BASIC SETUP (continued...)
6.2 STOP OPERATION
Stop Mode sets the behavior of the control output when
transitioning to a Stop when ending automatic control, while
the “STOP” indicator lamp is lit.
• No. 41 Stop Mode
• No. 4 Stop Level
• No. 5 Stop Time
• No. 6 Stop Minimum Value
• No. 7 Stop I Time
NOTE
The Stop Minimum Value affects all modes.
The Stop Minimum Value sets the effective
minimum that the Stop Level multiplier will
be multiplied. See examples below.
Mode 0: The control output at the time of the STOP condi-
tion is multiplied by the Stop Level, and then Stop I Time is
applied to the control output, causing the output to slowly
decay for the duration of the Stop Time interval (parameter
No. 7). A higher Stop I Time will cause the output to decay
more slowly.
The control output can still fall below the Stop Minimum
Value while under Integral control.
Mode 1 (default): The control output at the time of the
STOP condition is multiplied by the Stop Level for the dura-
tion of the Stop Time interval.
Mode 2: This mode operates similar to Mode 1. The control
output at the time of the STOP condition is multiplied by
the Stop Level, but unlike the immediate effect in Mode 1,
the transition to full stop output is filtered to avoid abrupt
changes of the stop output.
Mode 3: This mode is used to vary the effective Stop Level
multiplier based on the tension control output at the time
of the stop, decreasing the effective Stop Level as the roll
reaches core diameter. Set the Stop Level so that the web
does not sag when the line is at rest at full roll diameter.
FIGURE 6.4 Stop Mode 0
FIGURE 6.5 Stop Mode 1
FIGURE 6.6 Stop Mode 2
Control Output
OFF ON
Stop Output Level
Stop Decay
Operation
Stop time
Automatic
Contact
Automatic
Contact
Control Output
OFF ON
Stop time
Stop Output Level
OFF ON
Stop Output Level
Filter Operation
Stop Time
Automatic
Contact
Control Output
Equation 6.3 Stop Mode 3 Stop Output
Equation 6.4 Stop Mode 3 Effective Stop Multiplier
Stop Output % = +1 x Control Output % x
Control Output %
% Full Scale
Stop Level
2
Effective Stop Multiplier = +1
Control Output % • Stop Level
2 x % Full Scale