2 Expansion Options
Page 8 Mk8 MM Expansion Features Installation and Set-Up Guide 04.09.2016
Exp
Option
Default Range Description
1 0 Water Level Control Function
Expansion feature 1 must be unlocked on the MM For setting 1, there must
be a minimum of two level sensing elements or a conflict will appear. For
the possible water level sensing device combinations, please see section
3.3. The capacitance probes with/without external level sensor will be
commissioned at end of probe, second low, first low, control point and high
water.
0 Water level control disabled
1 Water level control enabled
2 0 Feedwater Control Element
The feedwater pump will turn on and off at the according to the levels set
relative to the control point, through expansion options 10, 11 and 12. For
setting 0, water going to the boiler is only controlled by the feedwater
pump output terminal BFW. For settings 1 and 2 the MM controls the
feedwater via a PID loop, see expansion options 13, 14, 15, and 16. For
setting 1 the MM uses the servomotor on terminals P-, FW, P+, MVI and
MVD. For setting 2 the MM uses the VSD on terminals I+, V+ and IV-.
0 Pump on/off only
1 Pump on/off and servomotor control
2 Pump on/off and VSD control
3 0 Capacitance Probes
If water level control is enabled, the MM will require a minimum of two
level sensing elements. For the possible water level sensing device
combinations, please see section 3.3.
0 Capacitance probes disabled
1 One capacitance probe
2 Two capacitance probes
4 0 External Level Sensor
The external level sensor is wired to terminals EX- and EX+ and will give a
4-20mA signal. The readings can be scaled in expansion options 30 and
31. If an external level sensor is used, then a 4-20mA signal for fuel flow
feedback cannot be enabled (option 57) and fully metered combustion
control cannot be enabled (expansion option 140). For the possible water
level sensing device combinations, please see section 3.3.
0 Disabled
1 Enabled
5 0 Auxiliary Alarm Inputs
For setting 1, the auxiliary alarm mains inputs terminals HAI, 1AI and 2AI
are used in addition to the capacitance probes with/without external level
sensor readings. For the possible water level sensing device combinations,
please see section 3.3.
0 Auxiliary alarm inputs disabled
1 Auxiliary alarm inputs enabled
6 0 Second Low Probe
For setting 0, it is recommended that an auxiliary second low mains input is
wired to terminals 2AI. For setting 1, the Autoflame conductive second low
probe is wired to terminals 4P-, 4P+, 6T- and 6T-. Please see local codes/
regulations for second low probe and auxiliary second low alarm setup.
For the possible water level sensing device combinations, please see
section 3.3.
0 Second low probe disabled
1 Second low probe enabled
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