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Page 20
DFS-1 Manual Revised 7/95
POWERTEC Ind. Corp.©
0001b) , the Run FUNCTION cannot be controlled
from the terminal strip, but can only be controlled
through the external communications link or the local
comm link (keypad display unit).
If VL1 has a value of 73 (0111 0011b), all
functions except UP and DOWN are controlled
remotely.
NOTE: Parameter #3 ONLY determines
whether a FUNCTION is controlled locally or
remotely. This parameter has nothing to do with the
assignment of functions to terminals.
Any input function can be assigned to any input
terminal with the exception of the Emergency Stop
input. The Emergency stop function is hard-wired on
the DFS-1 board and cannot be changed by either
programming or parameters.
If the RUN function is assigned to an input
terminal, and this parameter is set to remote the RUN
function control, the terminal will be IGNORED.
4. COMMUNICATIONS
PROTOCOL
USE PARAMETER #4 TO IDENTIFY THE NET-
WORK COMMUNICATIONS LANGUAGE.
RANGE OF VALUES: 0000 0000h to 0000 0001h
0 to 1 (decimal)
Default Value: 0000 0000h 0 (decimal)
At the present time, the only communications
protocol available is Powertec’s Binary protocol.
This parameter has been included with the intent of
providing alternative protocols at some time in the
future.
5. MODES OF OPERATION
USE PARAMETER #5 TO SET UP MASTER/
SLAVE AND TORQUE LIMITING MODES.
RANGE OF VALUES: 0000 0000h to 0003 0002h
no decimal significance
Default Value: 0000 0000h no decimal
significance
This parameter is a dual purpose command used
to set operational modes of the DFS-1:
VL2 VL1 sets the basic operation of the board.
There are three modes of basic operation used to
determine where the speed and/or torque commands
originate:
0000h MASTER mode (the board generates its
own speed/torque based on its parameters)
0001h SLAVE mode (the board follows an
external signal in direct proportion)
0002h INVERSE Slave mode (board follows
an external signal in inverse
proportion)
The DFS-1 board in MASTER mode generates
its own speed and torque commands.
In SLAVE mode the board follows a reference
frequency at TB2:A terminals 11(+) and 12(-), which
should be nominally 16 times the desired speed of the
motor. This signal is available from another DFS-1
board or from a BCDMAX board. It may also come
from another source which has a compatible line
driver output. (See the description for frequency
input elsewhere in this manual).
In INVERSE slave mode, the board follows the
external frequency in a proportion of 1/RATIO.
Instead of setting a direct ratio of 0.5000, a ratio of
2.0000 may be entered for half speed. This is useful
in cases requiring draw settings where the slave is
physically located before the master, which is set for
line speed.
VL4 VL3 contains information on modified
operational modes in which the torque in the motor is
limited below the current limit level (current limits
are always set by parameters 44 and 45). These
optional modes are defined as follows: