6 Draught Control
04.09.2016 Mk8 MM Expansion Features Installation and Set-Up Guide Page 107
6.3 Set-Up
6.3.1 Configuration
The draught control servomotor positions, and the stack pressure if using draught control is enabled, is
set during the burner commissioning procedure.
Due to softened error checking, it is recommended to use an industrial unic servomotor for the draught
channel; however a small/large servomotor can be used for smaller applications. The servomotor will
need to be sized according to the torque requirements of the stack damper. If draught control is
enabled in expansion 82, then a Mk8 air pressure sensor is also required, part number MM80005.
For information on installing the draught servomotor and air pressure sensor, please see section 6.1.2.
For dimensions and technical specification for the draught servomotor, please refer to the Valves and
Servomotors manual, and the MM Application Possibilities manual for the Mk8 air pressure sensor.
The table below shows the MM terminals for the draught servomotor and Mk8 air pressure sensor.
Terminal Description
DT+ Digital communication connections from draught control pressure sensor
DT- Digital communication connections from draught control pressure sensor
DP- 0V supply to draught control pressure sensor and draught control servomotor
DP+ +12V supply to draught control pressure sensor and draught control servomotor
DPW Signal from draught control servomotor, indicating position
DCI Switched neutral – drives draught servomotor clockwise
DCD Switched neutral – drives draught servomotor counter clockwise
When wiring the air pressure sensor, the screen is connected through the casing of the lead and
through the sensor; therefore the flying lead should be connected to the MM without a screen. The
screen should be carried through until the connection to the MM; the screen should not be connected
to the S terminal.
The table below shows the expansions options to be set when using draught control.
Expansion Option Description Setting
80 Draught control servo channel 1
81 Draught servo control method Depends on servomotor used
82 Draught control function As required
83 Draught servo minimum angle As required
84 Maximum compensation As required
85 Delay before compensation As required
86 Commissioned angle variation tolerance As required
87 Pressure tolerance before fault As required
88 Action on pressure sensor fault As required
89 Pressure sensor filter time As required
90 Proportional band As required
91 Integral time As required
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