Open-loop Multistep Ref A3
55
Detailed descriptions
The multi-step speed reference function is one
possible way for the drive to accept speed
command. To use this function, the user can
enter up to fifteen speed commands (CMD1 –
CMD15) and assign four logic inputs as speed
command selections.
Note: CMD0 is reserved for zero speed,
therefore is not accessible to the user for
programming.
During operation, the user will encode a binary
signal on the four logic inputs that determines
which speed command the software should use.
The user need not use all four speed command
selection bits; if no logic input is specified for
one of the selection bits, that bit is always zero.
For instance, if no logic input is specified for the
most significant bit (B3), that bit will be zero and
the user can select from CMD0 - CMD7.
IMPORTANT
Since these speed commands are selected with
external contacts, a new command selection
must be present for 50ms before it is
recognized.
logic input multi-step
STEP REF
speed
B3 B2 B1 B0 command
0 0 0 0
CMD0
0 0 0 1
CMD1
0 0 1 0
CMD2
0 0 1 1
CMD3
0 1 0 0
CMD4
0 1 0 1
CMD5
0 1 1 0
CMD6
0 1 1 1
CMD7
1 0 0 0
CMD8
1 0 0 1
CMD9
1 0 1 0
CMD10
1 0 1 1
CMD11
1 1 0 0
CMD12
1 1 0 1
CMD13
1 1 1 0
CMD14
1 1 1 1
CMD15
Multi-step Selection
An example of the use of the multi-step
command is as follows:
•
All speed commands are positive.
•
CMD0 specifies zero speed.
•
CMD1 specifies leveling speed.
•
CMD2 specifies inspection speed.
•
CMD3 specifies an overspeed limit.
•
CMD4 – CMD15 specify different top speeds
depending on number of floors in the run.
For typical use, the user will have all speed
commands to be positive, in which case a logic
input s (UP/DWN or RUNUP & RUNDOWN)
must also be specified to determine up or down
direction
.
It is possible for the user to specify
both positive and negative values for CMD1 -
CMD15, in which case logic input bit(s) are not
needed.
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