Johnson Systems EDI-120 Control Retrofit User Manual
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If more than four (4) analog inputs are required, additional equipment may be necessary to
facilitate them. Consult the factory for options and further information.
• Dress out and terminate any applicable connections for the input/output contacts on the
breakaway connector provided.
• Dress out and terminate any applicable +12VDC power supply connections on the
breakaway connector provided.
• The intention is for the DMX input receptacle (5-pin male XLR) on the front of the EDI
dimmer rack to be connected to the DMX-B input on the EDI-120 retrofit. To do this, the
existing wires connected to the XLR must be disconnected, and an applicable length of the
supplied 10’ (3m) Belden 9829 (or equivalent) cable must be reconnected to the XLR on one
end, and terminated on the DMX-B input breakaway connector provided on the other end.
Be sure to isolate and protect all shield wires and comply with standard RS-485 termination
practices.
Alternatively, the DMX-B input and thru connectors can be used for other purposes.
• Confirm all applicable field wiring is terminated on the breakaway connectors provided. For
future reference, be sure all cables are labeled using a permanent marker (Sharpie).
• Inspect the OEM P3, P4, P5 and P6 ribbon cables and determine if they are long enough
to easily connect to the EDI-120 retrofit. Four (4) 1’ (30.5cm) extension ribbon cables have
been provided to extend the OEM ribbon cables for ease of installation. When connecting,
be sure the OEM ribbon cable connector is fully seated in the provided extension ribbon
cable connector.
• An 8’ (2.4m) #18 AWG green wire has been provided for connection of earth ground to the
EDI-120 chassis. One end of the ground wire has a 0.250” female disconnect, and connects
to the male on the back of the EDI-120 retrofit. Locate a place inside the dimmer rack
chassis to connect the other end of the ground wire. Cut the wire to length, dress it out and
connect (fasten) it to the dimmer rack chassis.
WARNING: Ensure chassis is connected to earth ground.
• On some earlier versions of EDI Mark VII dimmer racks, the fan control was sensed from the
house control inputs, and the fan control wiring does not come through the P1 connector. If
this is the case, the fan control will need to be rewired from the P1 connector to the fan SSR.
5’ (1.5m) #18AWG yellow and brown wires have been provided to implement fan control
from the EDI-120 retrofit via the P1 connector to the fan SSR. For the yellow (fan control V+)
wire, the female pin on the one end inserts into pin 5 of the P1 connector and the other end
terminates to V+ on the fan SSR. For the brown (fan control V- (common)) wire, the female
pin on the one end inserts into pin 6 of the P1 connector and the other end terminates to V-
(common) on the fan SSR. Refer to page 10 for the P1 power connector pinout information.
• There are two (2) locations on the back of the EDI-120 retrofit where the P1 power
connector/cable can be installed - one (1) on the right-hand side and one (1) on the left-hand
side. When looking at the EDI-120 from the rear view, the P1 connector is installed on the
left-hand side location (more common) by the factory. Have a look at which side the power
cable comes out in the dimmer rack and determine if the P1 connector needs to be moved to
the right-hand side location.