Rockwell Automation WebPak 3000 DC Drives Hardware Reference, Installation and Troubleshooting - Manual (Page 26)

2-14 WebPak 3000 DC Drive Hardware Reference
The following three states are considered to be permutations of RUN mode:
SPEED, RUN TENSION, and JOG TENSION.
The drive will remain in RUN mode until the completion of a stop sequence and the main
contactor is opened. The drive is considered to be in the JOG mode if the drive was started via
the JOG input.
Note that the drive can enter the SPEED state from the JOG state if the SECTION RUN input is
asserted while in JOG mode. The drive will remain in JOG mode until the completion of a stop
sequence or until the RUN input is asserted causing the drive to switch from JOG mode to RUN
mode.
Note that the drive will only enter RUN mode on a rising transition of JOG, SECTION RUN,
or TENSION ON. This is to prevent unintentional starts when changing control sources.
For example, changing the control source from KEYPAD to TERMBLK will not start the drive
while the terminal block SECTION RUN is asserted. SECTION RUN must be deasserted then
reasserted to start the drive.
The addition of the TENSION ON input represents an additional start mechanism to the drive.
A rising transition on TENSION ON from the READY state will cause the drive to enter the RUN
mode with the tension major loop active in stall tension. If the drive is in not ready when a rising
edge is generated on TENSION ON, the same drive not ready message will appear on the
OIM. Once the drive is in the STALL TENSION state, a rising transition on the SECTION RUN
input will cause the drive to switch to the RUN TENSION state.
2.5.5.2 Provide the Emergency Stop-Function
WARNING: To inhibit uncontrolled machine operation in case of the malfunction
of the drive, the user must provide an external emergency stop circuit, which
ensures disconnection of the power source from the motor.
This circuit must be hardwired with electro-mechanic components and shall not
depend on electronic logic or software. The stopping device (e.g. mushroom head
pushbutton) must be accessible to the operator.
Failure to observe this precaution could result in bodily injury or loss of life.
It is the responsibility of the user to decide, how the Emergency Stop Function is fulfilled,
depending on the requirements of the application and based on a risk assessment of the
machine. Disconnection of the power source from the motor may be reached e.g. by one of the
following measures:
a) Circuit breaker used as Emergency Stopping Device:
- easy accessible to the operator, hand operated or
- remote operated, e. g. undervoltage trip coil released by mushroom head pushbutton.
b) Circuit breaker not used as Emergency Stopping Device:
- Emergency Stopping Device (mushroom head pushbutton) interrupts control circuit and
releases Coast Stop according to Category 0.
A Connection Diagram - Example for case b) is shown in Figures 3-8a and 3-8b.
FUNCTION: Actuating of the Emergency Stop pushbutton during operation, causes immediate
drop out of relay K10, opening the n.o. contact at input terminal 8 and blocking of the regulator.
At zero current, opening of contact output MCR will drop out the main contactor via auxiliary
contactor K1. The time delayed normally open contact of timer relay K10T ensures, that in case
of malfunction of the internal control circuit (MCR does not open) the main contactor drops out
after 1 second.