User Manual MCx-xxxAS-1.05
Page 7 of 18
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Rev.2021.8 [email protected]
Speed and Torque Settings
During normal operation, the actuator will try to reach the speed set by “
MaximumSpeed
”. If the torque required
to reach this speed exceeds the actuator model’s capability, the actuator will automatically slow down. Please
refer to the tables in the Speed and Torque Details section for
each actuator model’s torque capability.
To accommodate different valves and other applications with different torque requirements, the actuator can be
set to apply different torque on the valve stem when in the seating mode. Torque during normal operation is
always 100% of the actuator’s capability.
To deal with sticking valves, at the beginning of the first reversing movement after the seating (“zeroing”) of the
valve, the actuator
will apply double the power set by “
MaximumPower”
(up to 100% power.)
This “pull out” function is always enabled.
Register name
Address
Max Min
Default Actuator
address
Function
code
Register
address
Register
new value
CRC
MaximumSpeed 0x0000
3
0
N/A
Example:
Set Maximum speed to 0 in actuator
number 8
0x08
0x06
0x0000
0x0000
0x----
1 byte
1 byte
2 bytes
2 bytes
2 bytes
Possible values for the
“
MaximumSpeed
”
register are shown in the following table. To see how these values
relate to physical speed, see the Speed and Torque Details section.
Maximum speed value
Speed level
0
16%
1
33%
2
66%
3
100%
Register name
Address
Max Min
Default Actuator
address
Function
code
Register
address
Register
new value
CRC
MaximumPower 0x0001
3
0
N/A
Example:
Set Maximum power to 3 in actuator
number 9
0x09
0x06
0x0001
0x0003
0x----
1 byte
1 byte
2 bytes
2 bytes
2 bytes
Possible values for the
“
MaximumPower
”
register are shown in the following table. To see how these values
relate to physical torque values, see the Speed and Torque Details section.
Maximum power value
Power level
0
16%
1
33%
2
66%
3
100%
WARNING:
High power settings can supply enough torque to damage your valve.
Please be cautious, especially when using the 100% power setting.
Note: The 66% and 100% power settings have the following particularities:
-
Supply voltage needs to be min. 14 VDC for 66% setting
-
Supply voltage needs to be min. 16 VDC for 100% setting
-
When operating above 20 VDC and 66% power, Duty cycle is reduced to 50% - 25%
maximum. At these levels, the electronics produce more heat which must be dissipated
(depending on environmental temperature)
