Rockwell Automation 1336T Master/Slave Parallel AC Drv - Manual (Page 10)

1336 FORCE-5.19 – August, 2000
1-6 Introduction
The control function on the Master/Slave unit operates in much the
same manner as with a standard 1336 FORCE drive. All control
functions are performed through the use of parameters that can be
changed with a programming terminal or Drive Tools. Feedback
information is derived from hardware devices on the process
equipment. Feedback and control signals are provided to the drives
via the same adapter boards used on Standard FORCE drives.
All setup and operation information used by the parallel drive unit is
stored in a standard FORCE parameter table. In most cases, Slave
drive parameter settings are identical to Master drive settings.
However, the Slave drive has a predefined group of parameters that
require specific settings for parallel operation. Since the Master drive
controls the speed, torque, etc. many of the the slave drive parameters
are non-functional.
For ease and consistency of setup, we recommend that the non-
functional Slave parameters be set the same as the Master. Refer to
Chapter 3, Startup, for parameter settings that are exclusive to the
Slave drive. Note: Slave parameters P161-165 & P175-180 are set to
0.
Additional LED’s on the main control board labeled “Master” and
“Slave” have been added to monitor drive operations. When the Slave
Drive is in the ready state, but is not operational the “Slave” LED will
blink but the “Enable Slave” LED will be dark. A correctly operating
parallel drive unit will have all four operational LED’s illuminated
(Slave, Master, Enable Slave, Enable Master).
The drive features, operation and most specifications for Master/Slave
drives are the same as their respective G or H frame drive (500 HP
through 800 HP). This includes all of the velocity and torque options
as well as precharge, power loss ride through, encoderless, overload
capability, I/O, fast flux-up, faults and diagnostics. See the following
section in this chapter for specifications that are unique to the
Master/Slave drive.
1336 Master/Slave Drive Operation:
A start sequence should start the Slave drive first, followed by the
Master start. The Slave drive will maintain a ready state indefinitely
until the Master is started. During the Master start sequence, if both
drives do not enable within 1 second, an enable timeout fault will
occur. This enable timeout fault is specific only to Master/Slave
drives.
A typical stop sequence will disable the master drive first, followed
by a shut down of the slave (Never set the Master/Slave drive to stop
or disable the Slave drive first).
An external controller should monitor both Master and Slave drives
for faults. Any fault should then disable both drives. The controller
should also monitor both drive currents (Parameter 264, Motor
Current Magnitude Feedback). If an imbalance greater than 25% of
rated motor current occurs, the drives should be shut down.