Denford Triac VMC with ATC Conversion / Fix

[i2i]

Are the connections not 4 and 5 for enable? I can see relay SFR and GR there needed to enable. Connection 7 on mine looks like one of the tacho connections.

Either way can be used, 4 and 5 or 5 and 7 depends on the application. When the tacho option is used 6 and 7 are used for this and 4 and 5 are used for the spindle run, if yours is wired that way use 4 and 5. The guard relay will be in the circuit to limit the operation of the spindle if the cover is up, but the sgr would still be the relay that connects 4 and 5 on the sprint board.

PS. sfr may have replaced sgr.....edit...... Looking at the other photos sfr has replaced sgr, and common practice with denford machines is to control the relay on the ground side. To the left of the sfr is the srr, this reverses the spindle by changing the polarity to the motor.