Eaton CMA, User Manual

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13 CMA USER MANUAL
E-VLMB-TT005-E April 2019 www.eaton.com
CMA User Manual
Table 10 . Load sense parameter summary table
Object dictionary name J1939 section index CANOpen object Suggested default value Units
Load Sense Margin 608 0x4260 0 centibar
Load Sense Standby Pressure 901 0x4385 0 centibar
Loadsense Demand Bandwidth setting 634 0x427A 65000 See above
Loadsense Demand Rising ROC limit 635 0x427B 650000000 cBar/1.5 ms
Loadsense Demand Falling ROC limit 636 0x427C -650000000 cBar/1.5 ms
6.1.2 Actuator areas
When possible, the valve needs to understand the physical
geometry of the actuator that it is trying to control. There
are two main reasons that the valve needs the cylinder
areas, both of which only apply to twin spool control
modes. The areas of the cylinder are required for the valve
to determine if the load is passive or overrunning (which will
be discussed in the next section). If the load is overrunning,
a meter out control strategy is sometimes applied
(depending on the twin spool controller selected) and the
area is required to maintain the desired cylinder velocity.
There are two areas settings for the valve, one for each
port. For most applications, mm2 is the preferred unit as
this offers enough resolution to provide proper control.
If you are working with double acting cylinder, a rotary
actuator, or a service that is plumbed so the area ratio is
1 to 1, then 1 can be entered for each work port area.
Figure 2 .
Port 1 Port 2
Table 11 . Area parameters
Object dictionary name J1939 section index CANOpen object Suggested default value Units Valid range
Area of Work Port 1 609 0x4261 App Dependent mm2 1…32767
Area of Work Port 2 610 0x4262 App Dependent mm2 1…32767
otee: N The units for each area input are not important as
long as they are the same for both areas (the valve
only cares about the ratio between the two areas).
However, we want to maintain the highest level of
accuracy without causing integer overflow. Mm2 is the
suggested unit, but other units can be used as long as the
maximum value does not exceed 32767.