32
CMA USER MANUAL
E-VLMB-TT005-E April 2019 www.eaton.com
CMA User Manual
7 Trouble shooting guide
Table 34 .
Problem
Possible cause(s)
Solution(s)
Valve does not respond to demands
1. Anti saturation algorithm is turned on and there is
no available flow message
1. Disable anti saturation algorithm or send available flow message
2. CAN Identifier is not correct for the VSM you are
trying to communicate with
2. Use Pro-FX Configure to determine what the VSM address is.
If there are multiple VSM’s, the VSM can be identified by the ECU
instance number in the name field (refer to J1939 for more details)
3. There are critical errors
3. If there are critical errors, attempt a valve reset (soft or hard).
If the errors persist, contact your local Eaton representative.
4. A valve has been replaced and the air bleed and
training routine have not been completed
4. Request air bleed through Pro-FX Configure or implement in
the user application. Once the air bleed has been completed
successfully, request the valve train. Refer to the Valve
Replacement section of this guide for more details.
5. A valve has incorrect firmware version (does not
match the other nodes on the system)
5. If a pilot valve replacement is necessary, the pilot valve major
version needs to be the same as the major version of the rest
of the nodes on the system. The same is true for the object
dictionary version. When ordering replacements, please verify
what version of software is required.
6. Message transmission rate is slower than the
timeout set in the VSM
6. Increase the transmission rate frequency in the application. If
appropriate, the mode demand timeout can also be increased
on the VSM.
7. Supply voltage is above or below the 9 to 32
volt range
7. The supply voltage can be monitored through a monitor request to
the VSM (section index 509). Refer to the Application Developers
Guide for more details.
8. Supply pressure is too low to safely control
the valve
8. Supply pressure can be monitored through Pro-FX. Also, a warning
message will be sent over the User CAN. This check can be
disabled (see section on Minimum Inlet Pressure). However, some
pilot pressure is required to move the spools.
9. Incorrect cable assembly
9. Refer to the Technical Catalog for proper wiring of the
CMA system.
10. Invalid control mode sent to the valve
10. Refer to the Application Developers Guide and associated
tools. The Traffic Monitor in Pro-FX can be used to debug
communication to the valve.
11. There is no pilot pressure or pilot pressure is
too low
11. Monitor the supply pressure observed by the inlet controller.
Check system hydraulics.
12. The user CAN bus or the interconnect CAN
is not properly terminated
12. Refer to the Technical Manual. Also make sure the CAN D bus has
a terminator fitted.
When multi-servicing, the largest load
stops moving
1. The valve is saturating because no anti saturation
scheme has been set
1. Select the appropriate anti saturation scheme (ratio, uniform,
or cascade).
2. An anti-saturation scheme has been chosen but
the available flow message is incorrect
2. The available flow can be monitored through a monitor request to
the VSM (section index 60).
3. The transient flow consumption is too high on a
particular service
3. Reduce the available flow by adjusting the gain or offset on the
VSM. The user could also implement ramps on the demand to limit
the rate of change on the flow demand.
The service does not reach the full
commanded velocity
1. The flow limit in the valve is too low
1. Increase the flow maximum setting on the valve. Check to make
sure the valve is getting the demand as the user expects (make
sure to check
2. The valve is entering pressure control
2. Check to make sure the pressure limit is set to what is required by
the application
3. The system is entering an anti-saturation scheme
3. Change the anti-saturation scheme to give priority to this service
(if that is what is desired)
When using UFC, the meter out
pressure drop gets very large
1. The UFC gain on that respective work port is
too low
1. Increase the UFC gain
