Nexen RSTC1100 964528 - Manual (Page 11)

11 FORM NO. L-21204-C-0705
INPUT/OUTPUT DESCRIPTIONS (CONT.)
scaled such that 0 V or 4 mA corresponds to Minimum
Tension Setpoint and 10 V or 20 mA corresponds to
Maximum Tension Setpoint. If Control Output B is being
used as a web tension monitoring output, then it is not
available for use as a web tension control output. Only
Control Output A can be used for tension control in this
instance.
C
ONTROL
I
NPUTS
Run/Stop: When 12 – 24 VDC is applied to this digital
input for at least 100 milliseconds, the RSTC will respond
according to Run/Stop option selected during setup of
the RSTC (refer to SIGNAL CALIBRATION) and cause
the RSTC to go into the run mode or the stop mode. The
RSTC will actively control tension in both the run and stop
modes, however the RSTC will only adapt its control gains
in the run mode. During stop mode, all control gains are
held constant.
NOTE: For unwinding applications, do not provide
the Run signal when the web remains stopped. This
will cause the RSTC to increase its gains too much
and produce tension oscillations when the web does
fi nally move.
Splice A/B: When 12 – 24 VDC is applied to one of these
digital inputs for at least 100 milliseconds, the RSTC will
respond by resetting Adaptation to a level determined
by SPLICE ADAPTATION. The RSTC will also make
the corresponding Control Output active and the other
standby. The 12 – 24 VDC signal can be momentary or
maintained, however only one Splice Input can have the
signal applied at a time.
After power up, the RSTC will look at the Splice A and
Splice B inputs. If both are high or both are low then
Control Output A is made active and Control Output B
goes to standby. Therefore, apply the splice signal after
power up to insure the proper Control Output is active.
Any output in standby mode will maintain a constant output
level as determined by STANDBY OUTPUT variable. Also,
if Web Tension Output is enabled, then Control Output B
is no longer available for web tension control and Splice
B input is ignored.
The Control Inputs can be isolated from the RSTC power
supply by using a separate power source and common.
Control Signal Common is the return line for the Run/
Stop and Splice A/B input signals. Control Signal Shield
is the terminal for connecting the cable shield to chassis
ground.