Rockwell Automation 1395 Reel Tension Paster Adapter - Manual (Page 13)

Publication 1395-RTP-5.1 - September 1997
Chapter
2
Description of Operation
Drive System The RTP Drive utilizes a three phase, armature regeneration, digital
DC Bulletin 1395 Drive to control the DC motor in a surface driven
unwind.
The speed demand for the Unwind Drive is generated from press
speed via a zero speed magnetic pickup. In normal operation, the
press speed reference is trimmed by dancer position error to maintain
constant dancer position.
The Drive allows for speed matching, automatic slack take-up, paying
off to full dancer storage, regenerative stopping under current limit
control and regenerative stopping with controlled deceleration.
Drive System Modes The Drive operation modes are grouped as follows. Refer to Logic
State Diagrams in the System Binder as required.
The status of each input and output signal to the Drive Digital
Reference Adapter Board is tabulated at the end of this section. This
table may be used to diagnose the status of the system if a fault is
suspected. LED indicators are employed on the Adapter Board to
assist in identifying which inputs and outputs are ON at any given
time.
Mode 0
DRIVE READY
When the Drive is at standstill with the contactor open in a ready
condition, it will be in Mode zero. In this Mode, the Drive is waiting
for any type of run command.
Mode 1
NORMAL RUN (Motor controller follows press speed trimmed by
dancer position)
A “Drive Permit” signal is received which starts the Drive. A pulsed
“Emulate” signal is also received, approximately 2 seconds in length,
which allows the Drive to pull the dancer into position without
detecting a web out.
Mode Description
0 to 14 Drive logic
20 to 3l Drive reference control