Nexen RSTC1100 964528 - Manual (Page 10)

FORM NO. L-21204-C-0908 10
INPUT/OUTPUT DESCRIPTIONS
NOTE: Refer to Figure 4 for RSTC Pinout.
USB Port: This port is used to connect to a personal
computer during setup, tuning, or diagnostic monitoring
of the RSTC and is compliant with USB 2.0.
Network Port: This port is for communicating with the
RSTC using a networking protocol. Refer to the HMI/PLC
Design Guide for network specifi c information.
Network Indicators: Indicators will illuminate to show
status of network communications. Refer to the HMI/PLC
Design Guide for network information.
Power Input: RSTC requires 24 VDC to operate (Refer
to SPECIFICATIONS for current rating). A green indicator
visible through the top cover will illuminate when this
voltage is present. Common is the return line for the
24 VDC power supply. Earth Ground is the terminal for
connection to Earth Ground via a low resistance conductor.
Two terminals, 3 and 46, must be connected to Earth
Ground in order for cable shielding to work properly.
Reset: A reset switch, accessible through the top cover,
will reset the RSTC whenever depressed without having
to cycle power on and off.
Alarms: Transistor outputs that can be confi gured for
normally open or normally closed operation (Refer to
SPECIFICATIONS for ratings). Alarm 1 is activated
whenever a web break is detected. Alarm 2 is activated
whenever one or more of the following conditions occur:
No Control: control signal output has reached 0% or
100% during automatic operation and web tension is
not at set point. This is often caused by accelerating a
large roll too quickly or excessive web speed near core.
Both cases can cause excessive tension with a control
output at 0% and unable to decrease any further. “No
control” can also be cause by a large roll decelerated
too quickly causing the output to go to 100%, but the
web tension remains below setpoint.
High Tension: Web tension is greater than the high-
tension limit.
Low Tension: Web tension less than low-tension
limit.
Max Output: Control signal output has reached
maximum output limit, typically 100%.
Zero Output: Control signal output has reached
minimum output limit, typically 0%.
The alarm outputs can be isolated from the RSTC power
supply by using a separate power source and common.
Alarm Common is the return line for the alarm signal. Alarm
Shield is the terminal for connecting the alarm cable shield
to chassis ground.
Control Outputs: The Control Output signal is used to
change the torque output of a pneumatic brake or clutch
via an electro-pneumatic converter or a motor drive
system for the purpose of controlling tension. There are
two channels of control outputs, Control Output A and
Control Output B. Each channel has a 0 – 10 VDC and
4 – 20 mA output signal. All Control Outputs are isolated
from the RSTC power supply. Only one channel at a time
can be used to control tension. When one channel is
active the other channel is in standby mode. The choice
of whether a Control Output is active or in standby mode
is made with the Splice Control Inputs. The 0 – 10 VDC
and 4 – 20 mA terminals are the control signal outputs.
Common is the return line for the control signal outputs.
Signal Shield is the terminal for connecting the cable shield
to chassis ground.
Load Cell Inputs: The RSTC will accommodate two
web tension sensing load cells. Polarity of the load cell
signals does not matter as long as the polarity of both load
cell input signals are oriented the same. The +/- Sensor
Signal is for the tension level signal from the load cells.
The +6 VDC Excitation is the power supply for the load
cells. Excitation common is the return line for the load cell
power. Load cell cable shields must be tied directly to
Earth Ground for best noise reduction
Diameter Input: This input provides winder roll diameter
measurements for the taper tension algorithm and is not
used for anything else. Diameter signal can be provided
by a diameter sensor or voltage source, such as a PLC’s
analog output card, capable of 0 – 12 VDC maximum
signal range. The +24 VDC Excitation and +12 VDC
Excitation provide power when using a diameter sensor.
Common is the return line for the diameter signal and
sensor excitation. Diameter Sensor Shield is the terminal
for connecting the diameter sensor cable shield to chassis
ground.
Remote Tension Setpoint: This 0 - 12 VDC input allows
the tension setpoint to be set by an external potentiometer
or analog signal (See Figure 7). Remote Tension Setpoint
is scaled such that 0 V corresponds to Minimum Tension
Setpoint and 12 V corresponds to Maximum Tension
Setpoint. When using a PLC that outputs lower than 12
V, adjust the Maximum Tension Setpoint to compensate.
Before using Remote Tension Setpoint, it must be enabled,
see TUNING, afterwards tension setpoint changes from
all other sources are ignored.
Web Tension Monitor: Web tension can be monitored as
a 0 – 10 VDC or 4 – 20 mA signal from Control Output B
when enabled, see SETUP. Web Tension Monitor is