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How to set a version 17 green aspect PCB to legacy mode

This article outlines how to switch nearside PCBs to legacy mode to improve compatibility and prevents false warnings with older systems.

Use legacy mode when the lower current draw of a version 17 green aspect PCB causes an older controller to report a false lamp fault.

Why legacy mode is needed

Version 17 green aspect PCBs use less power than earlier boards. Some controller current-monitoring systems can interpret the lower load as a failed aspect. Legacy mode changes the PCB behaviour to improve compatibility. Red aspects are not affected.

Applicable boards

Product

Description

PCB

AGD940

Puffin nearside signal

CB-236

AGD942

Toucan nearside signal

CB-238

AGD943

Pegasus nearside signal

CB-230

AGD946

Combined Puffin signal and demand unit

CB-236

AGD947

Combined Toucan signal and demand unit

CB-238

AGD949

Combined Pegasus signal and demand unit

CB-230

Controller compatibility in the source note

Controller

Version 17 option

Dynniq PTC1

AGDMAN_V17 or AGDMANCYCLE_V17

Telent Optima

AGD GM V17 or AGD Toucan V17

Siemens STXX

Not supported in the source note

Confirm current controller support before changing the PCB. Legacy mode is required when the controller cannot support version 17, or when one version 17 board is fitted alongside green aspect boards at version 16 or earlier in the same installation.

Identify the board version

  1. Isolate the signal and prove it is dead under the approved traffic signal procedure.

  2. Open the signal and locate the green aspect PCB.

  3. Read the manufacturing label and find the number following CB23X.

  4. Continue only if the board version is 17 or later. Legacy mode is not supported on an earlier board.

Change to legacy mode

  1. With the aspect isolated and not illuminated, locate the jumper on the rear of the PCB.

  2. Remove the jumper from the default LO position and fit it to the vacant MID position.

  3. Reassemble the signal, restore power under the approved procedure and confirm correct controller monitoring and aspect operation.

To return the PCB to normal mode, isolate the aspect and move the jumper from MID back to LO.

 

Applies to AGD940 AGD942 AGD943 AGD946 AGD947 and AGD949 green aspect PCBs listed in the source note

Source Green Aspect NSS Legacy Mode V17 using MI106 version 8