For the Synesso Cyncra install, we use the original micro switches and remove the high voltage from them - making the contacts in effect 'Voltage Free Contacts'. A loom is supplied to make the connection from the ShureShot Driver Board to the original Synesso Lever Switches. These are our logic level inputs.
From there, the ShureShot provides "Line Level" (220~240VAC) outputs to drive the brew solenoid valve, the pump and an optional pre-infusion bypass valve.
Electricity can and will kill! These modifications should only ever be performed by a qualified and reputable service technician. Power must be isolated from machine before any work is to be carried out.
On your Synesso, you will note there is an angle channel running the length of the machine from one side to the other. We recommend mounting the driver board on the vertical surface of this angle - just inline with the right of the group cover box section.
The wiring for a Synesso Cyncra is fairly straightforward;
Firstly you need Neutral and Active supplied to terminals L1 and L2. These can be picked up from terminal blocks located behind each group head on the Cyncra. We have supplied short lengths of blue and red wires for this purpose. Connect the red wire to the terminal with red "permanent active" wires. Connect the blue wire to the terminal with the blue wires in the terminal strip.
Firstly, take a moment to familiarise yourself with the lever switches and how they presently operate. As supplied from the factory, the lever switches are switching line voltage (220~240VAC).
The top switch is activated first and switches on the brew valve when the lever is placed in the centre position. For our purposes, we will call this Switch 1 or "SW1". This will (usually) have a white wire connected and runs to the brew valve. You may choose to use this original wire or discard it altogether, as we supply a new grey wire connected to our Output #1
The lower switch is activated when the lever is placed in the leftmost position and switches on the pump. We will call this Switch 2 or "SW2". This will (usually) have a white wire connected and runs to the pump relay (located in the control box). Identify this wire now and mark it with a piece of tape and label it - as you will need to connect it to the ShureShot later.
NOTE: Our terminal numbers on this particular board are numbered RIGHT to LEFT
Disconnect the original wires from all 4 terminals on your lever switches as follows;