Delta Computer Systems VMC 186/40 Manual page 34

VMC 186/40 Motion
Number of
Recirculations
1
2
4
Counts per mm =  * Recirculations
Maximum Linear Transducer Length = 
Longest Measurement Time = Distance on Transducer in mm * Delay * Recirculation
Maximum Resolution = 
Number of
Recirculations
1
2
4
CAUTION: The longest measurement time should never exceed 1000 microseconds. The data used by the
VMC 186/40 must be available within its millisecond control loop for precise control. If more than 1000
microseconds is required to obtain a position measurement, the controller will slow down to a two millisecond
control loop. If a two millisecond control loop is required, a slight bump will occur in the motion of the axis at
the transition point.
JUMPER P8-P11
(Default Four Recirculations)
Jumper P8 for axis 1
Jumper P11 for axis 3
P8 P9
1 1
1
2 2
4 4
1 1
3
2
2
4 4
P10 P11

Maximum
Linear Measurement
Transducer
Length
130"
65"
32"
Transducer Delay per mm (358.27ns typical)
18ns per clock (55.5 Mhz clk)
1 mm
Counts per mm
Maximum
Linear Measurement
Transducer Time @ 750mm
Length
3293mm
1647mm
823mm
Jumper P9 for axis 2
Jumper P10 for axis 4
2
4
Typical Maximum
Usable
Time Transducer
@ 30" Resolution
273us .002"
546us .001"
1092us .0005"
65535
Counts per mm
Typical Maximum
Usable
Transducer
Resolution
269us .0502mm
537us .0251mm
1075us .0126mm

34
Hardware Information