Double Heading Board Notes

This page has general information on the DHB-202 double heading board.

This diagram shows an overview of how a system can be wired.

In this diagram we have shown an extra CLM-807 being used between the DHB-202 and the front of loco 2. This allows for an easy connection between the locos by means of a short DIN to DIN lead. We recommend only using 6 wires for this lead, this keeps the HRBs separate and prevents batteries at different voltages causing damage.

This arrangement also makes it easy to switch between single engine operation and double heading mode.

Controller 2 [socket C2] provides power for the DHB-202.

Batteries B1 and B2 can be different voltages BUT B2 must be 24V or lower if the DHB-202s internal power supply is to be used. If B2 is greater than 24V then an alternative 5V supply must be provided – on the Pro-160 / 360 this can come from the BEC socket.

Selection between hand control and radio control operation is done by a jumper link on the board.

Note: the zero value from the output of the DHB-202 is very slightly different from the RBT-24V throttle. To prevent this causing creep, we recommend using the pot learn function on both controllers to teach them the zero and full speed positions.

Switch on sequence.

The DHB-202 gets its power supply from controller C2. Therefore, C2 must be the first controller of the pair to be switched on. If this sequence is not followed, then the behaviour of controller C1 may be unpredictable.

“Bring-up” sequence.

This sequence has been found useful when installing and commissioning the DHB-202 with two controllers.

1. Stage 1- To confirm that each controller is working correctly.
   1. Switch C1 controller to profile 1 and test for correct fwd and rev operation with RBT* plugged directly into the P_C socket of controller C1.
   2. Switch C2 controller to profile 1 and test for correct fwd and rev operation with RBT plugged directly into the P_C socket of controller C2.
2. Stage 2 – To confirm that the C2 controller and DHB channel C2 is working correctly.
   1. 1. Switch C2 controller to profile 3, plug the RBT into the DHB, connect C2 of DHB to P_C of controller C2.
      2. Test for correct fwd and rev operation of controller C2. If not, then carry out pot learn procedure on controller C2.
3. Stage 3 – To confirm that the C1 controller and DHB channel C1 is working correctly.
   1. Switch on C2 controller.
   2. Switch C1 controller to profile 3, connect C1 of DHB to P_C of controller C1.
   3. Test for correct fwd and rev operation of controller C1 and C2. If not, then carry out pot learn procedure on controller C1.

[* RBT refers to our hand control box, but any other proven, hard-wired controller can be used, such as our CTB-001 test board.]