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NOTE: The total accumulated count when turns counting is enabled is a volatile value. This number
will be lost on a power failure. Steps should be taken to save this value to a nonvolatile
integer file in the SLC processor if maintaining position data is important to your application.
The Save Command can also be used to save the current position, therefore, not losing the
turns count.
Parameter 5 is only used on two axis modules into which a multi-turn dual resolver assembly is being
wired. A multi-turn dual resolver assembly contains two resolvers geared together through a 64:1 or
128:1 precision gear reducer. One resolver provides fine position data per turn of the input shaft while
the course resolver keeps track of the number of turns. A zero in parameter 5 configures the module
for operation with a 64:1 dual resolver assembly. A one in parameter 5 configures the module for use
with a 128:1 dual resolver assembly.
When configured for use with a dual resolver assembly, the scale factor set in parameters 2 and 3 will
be the count change over the total number of turns.
For example, if the scale factor was 640 and the ratio was 64:1, each turn would be 10 counts. The
total accumulated count of a multi-turn dual resolver system is absolute and will not be lost on a power
failure. Also, any movement of the mechanism while power is off will be reflected in the total position
count when power is restored.
Example:
Parameter 5 (turns ratio) set for 1 (128 turns)
Parameters 2 and 3 (scale factor) set for 12,800
Parameter 4 must be set to zero
The position count will count from 0 to 99 over the first rotation, 100 to 199 over the second, 200 to
299 over the third and will continue increasing by 100 counts per turn until 12,799 is reached at the end
of turn 128. The system will roll over to zero and begin counting up again if the resolver continues
rotation in a positive direction beyond 12,799. Reverse rotation below zero will result in a count that
jumps to 12,799 and continuous counting backwards.
The default values for the scale factor is 4096 and the turns counting is set to zero (disabled). The
default setting for the multi-turn resolver is 64:1. Save Configuration Command will save these values to
EEPROM.
NOTE: When the scale factor or turns count is changed, all offset values will be reset to zero. This
includes the home position and all reset-to-preset offsets.
Command 3: Home Positioning Data
This command will reset the position of the resolver indicated to match actual machine position.
Example:
With the machine stopped at the "0" position, parameters 2 and 3 (Home
Position) must be set to "0". The parameters for this command have been
defined on next page:
9
Spec Tech Industrial Electric
www.spectechind.com
Installation & Programming Manual
www.spectechind.com
888-773-2832
Chapter 3: Set-Up & Programming
888-773-2832
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