Printed in Germany / M-MT-BOS
• Edition 11.99 • # 231 763
8 … 112
MPA22 can be parameterised so that the servomotors can rotate both anti-
clockwise and clockwise in all operating modes. Two reference marks (A and
B) can be used for the servomotor. Also, the reference point can be defined as
0° damper position or 90° damper position. Depending upon the combination
selected, anticlockwise rotation or clockwise rotation is possible. Four different
combinations are possible for every servomotor.
Starting point 0
The reference mark A is used. The direction of rotation is anticlockwise. The
zeropoint of the air- and gasdamper is on reference mark.
The rotation range of the air damper must be -5° to the desired angle (max. 95°).
The rotation range of gas damper (if exist) must be -5° to 109°.
Stops are to be provided at the rotation range limits.
Starting point 1
The reference mark A is used. The direction of rotation is clockwise. The
zeropoint of the airdamper is 90°, the zeropoint of the gasdamper is 109° in
rotation anticlockwise of the reference mark away.
The rotation range of the air damper must be 0° to 95°.
The rotation range of the gas damper (if exist) must be 0° to 109°.
Stops are to be provided at the rotation range limits.
Starting point 2
The reference mark B is used. The direction of rotation is clockwise. The
zeropoint of the airdamper is 90°, the zeropoint of the gasdamper is 109° in
rotation anticlockwise of the reference mark away.
The rotation range of the air damper must be 0° to 95°.
The rotation range of the gas damper (if exist) must be 0° to 109°.
Stops are to be provided at the rotation range limits.
Starting point 3
The reference mark A is used. The direction of rotation is anticlockwise. The
zeropoint of the air- and gasdamper is on reference mark.
The rotation range of the air damper must be -5° to the desired angle (max. 95°).
The rotation range of gas damper (if exist) must be -5° to 109°.
Stops are to be provided at the rotation range limits.
In the operating modes „oil firing, three stage“ and „gas firing, pneumatic
modulation“, the damper stops are required for reasons of safety. In the
operating mode „Gas firing, electronic modulation“, an automatic device for
recognition of interchanged servomotors is integrated. The stops are required
to ensure that this device works properly.
Direction of rotation of the
servomotors
Specifications
Setting the parameters
Starting point Reference Direction of Damper position at reference Parameter in EEPROM
rotation
airdamper gasdamper
0 A anticlockwise 0° 0° 0
1 A clockwise 90° 109° 8
2 B anticlockwise 90° 109° 16
3 B clockwise 0° 0° 24
This setting applies to servomotor air and servomotor gas. If only one servomotor and one coding plug are connected,
the setting of the servomotor gas is irrelevant.
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