Continental Hydraulics Installation Manual
Page 4 of 15
CEM-MS-A
CHI 1013478 Jan 2013
Stroke Dependent Deceleration:
The CEM-MS module uses the position control theory of stroke dependant deceleration. When a
new position is commanded, the initial motion profile is ramped and speed controlled in open loop
mode. As the load travels, it soon gets to a preprogrammed point, termed the braking point. At
the braking point, the module converts to closed loop control, constantly adjusting the speed of
the load, homing in on the final stopping point.
100%
0%
Speed
0%
Position
100%
Adjustable Top Speed
Adjustable
Acceleration
Ramp
Adjustable Deceleration
Start Point (Braking Point)
"Square Root"
Deceleration
The main parameters used to control this profile include:
STROKE:
load distance.
A:A and A:B:
ramping times
VELO:
internally controlled velocity
D:A and D:B:
Deceleration start point
STROKE defines the full motion. Valid options are 10 to 10000. Default is 100. Units are mm.
A:A and A:B parameters are acceleration (ramp) rates. A:A is the direction of the load connected
to the A work port of the proportional directional valve (+voltage out of CEM-MS Pin 15). A:B is
acceleration of the B port. Valid options are 1 to 5000. Default is 100. Units are msec.
All ramp rates are set via software. All ramps are specified in milliseconds, and are actually “time
to ramp for a 0 to 100% signal change.”
Example: A value of 2000 will give a ramp time of 2 seconds for a VELO parameter of
100% (10000). The ramp time will be 1 second for a VELO parameter of 50% (5000).
100%
0
1
2
3
50%
0%
4
Time (seconds)
VELO
parameter
(A:A = 2000)
D:A and D:B are the deceleration start points(braking points). Valid options are 1 to 10000.
Default is 10. Units are mm.
