Eurotherm 590SP, Product Manual

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590SP Digital Product Manual
App. M - 16
Appendix M Special Blocks and Application Notes
M
For an unwind or rewind using varying new core sizes or parent roll sizes, the diameter must be set for each roll.
Configure terminal A2, EXTERNAL DIAMETER PRESET, to set RESET VALUE by setting analog input 1’s
DESTINATION TAG to 462. A 0 to +10 volt signal now provides the preset where +10 volts is the full or maximum
roll diameter. That signal can be generated by an operator potentiometer, a Eurotherm Drives 5570 Ranger ultrasonic
transducer (catalog number 311-LB), or other diameter input device.
Line Speed Reference
A line speed reference is required for the diameter calculator to work. It should be scaled to p10 volts at full
speed and connected into terminal A4, LINE SPEED. If this signal comes from a source other than a Eurotherm
Drives motor controller, it may need to be scaled and isolated. This signal is connected to parameter SETUP
PARAMETERS:: SPECIAL BLOCKS:: DIAMETER CALC.:: LINE SPEED. If type 5703 Peer-to-Peer
Communications Modules are used, digital line speed signal may be substituted for the 0 - 10 volt analog signal.
Tension Setpoint
The tension setpoint of 0 to +10 volts is connected to terminal A5, TENSION SP. Typically this signal could come
from a potentiometer supplied from the drive’s +10 volt terminal, B3. This signal is connected to parameter SETUP
PARAMETERS:: SPECIAL BLOCKS:: TAPER CALC.:: TENSION SPT. If the serial communications option is in-
stalled, the tension setpoint could be generated by a PLC, supervisory computer, or 5721 operator station.
Taper Setpoint
A taper setpoint, if required, of 0 to +10 volts should be connected to A6, TAPER SETPOINT. The range of taper can
be set by the MAX VALUE and MIN VALUE for the analog input in the CONFIGURE I/O menu. This signal is con-
nected to parameter SETUP PARAMETERS:: SPECIAL BLOCKS:: TAPER CALC.:: TAPER. If the serial communica-
tions option is installed, the taper setpoint could be generated by a PLC, supervisory computer, or 5721 operator station.
Tension Enable
Connecting 24 VDC to terminal C4 selects tension mode. When used with a run signal at terminal C3, C4 adds an
overspeed, TAKE UP 1, to saturate the speed loop.
Overwind/Underwind
Digital input terminal C6, OVERWIND, selects the winding direction, ON for overwinding and OFF for
underwinding. If only unidirectional winding is required, set the winding direction manually using parameter SETUP
PARAMETERS:: SPECIAL BLOCKS::OVER WIND. Remember to disconnect terminal C6 by changing its
DESTINATION TAG to 0 in the CONFIGURE I/O menu.
Preset Enable
24 VDC at digital input terminal C7, PRESET ENABLE, selects the PRESET ENABLE. When ON, the diameter
memory is preset to the diameter preset input value or minimum diameter as described earlier.
For a simple rewind, an operator can use a pushbutton to reset to core when the full roll is removed and a new roll is
started. For an unwind, the operator presets the new roll diameter using either a potentiometer, a 5570 Ranger ultra-
sonic transducer, or some other diameter input device.
Current Limit
CUR. LIMIT/SCALER is set to 200 percent. Set MAIN CURR. LIMIT to suit the application, normally 120 percent.