6 MM Features
Mk8 MM Manual Page | 134
6.9 Start Position Interlock and Purge Position Interlock
Options/ parameters 154, 155 and have been added to set the function of terminals 80 and 81, respectively.
Terminal 80 can be used for start position interlock and Terminal 81 can be used for either purge position
interlock or purge pressure proving. Proving valves (end switch) provides a secondary confirmation that a
valve has reached a predefined position.
To install the End Limit Switches,
1. Mount the servomotor onto the valve and ensure the potentiometer reads the correct position on the
MM for the “CLOSED” and “OPEN” valve positions.
2. Mount the End Switch Proving Unit (E.S.P.U.). The servomotor may have to be moved to a suitable
position in order to allow the E.S.P.U. to be attached to the valve.
3. Undo the End Limit Switch holding screws.
4. Adjust the position of CAM corresponding to switches 1 (S1) and 2 (S2) by loosening the CAM
screws and move to the required position.
5. Wire the ESPU according to the Valve Proving the End Limit Switch will be required to provide. See
the End Limit Switch wiring diagram in Figure 4.5.i
Note: The use of these switches is determined by the application approval necessary. These are not
required to meet UL, FM or CE.
Figure 6.9: End Switch Wiring Schematic
End Limit Switches are mounted on the end of bespoke valves (please contact Autoflame regarding bespoke
valve manufacture) which are attached to the air and fuel valve and commissioned depending on the use of
the End Limit Switches. An End Limit Switch comprises of two switches, as shown in Figure 4.5.i. Each
comprises of an Earth and 6 connections to be wired as appropriate. The switches S1 and S2 are setup as
per on site specification. These are then wired into either or both terminals 80, the start position interlock,
and terminal 81 purge position interlock.
If option/ parameter 154 is set to 1, then the MM waits at RUN TO IGNITION until this interlock is made on
terminal 80. If option/ parameter 155 is set to 1 then MM waits at RUN TO PURGE until this interlock is made
on terminal 81.
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