Chapter 1: Installation
CDC4 Door Controller Installation and Programming Manual 5
Transformer installation
Connect the wires of the output lead to a terminal block supplied with the device
as shown in Figure 3 below.
Figure 3: Transformer output lead termination
If the transformer needs to be replaced, follow the steps below:
1. Disconnect the mains lead.
2. Disconnect the output lead from the device that it is supplying power to.
3. Remove all earth connections from the transformer earth tabs.
4. Undo the screws and remove the transformer retainer.
5. Remove the old transformer and replace with the new transformer.
6. Reverse the process.
Fuse replacement
The transformer is fused to protect against over current conditions.
WARNING! If the transformer output fails due to a blown fuse, identify and
remove the cause of the failure before replacing the fuse. If the fault repeats,
then seek advice from the manufacturer or their service agent. Do NOT
repeatedly replace the fuse. Only use replacement fuses that meet the
requirements set out in “Specifications” on page 41.
Figure 4: Fuse holder
(1) Active fuse
(2) Spare fuse
Follow these steps to replace the active fuse with the spare fuse:
1. Disconnect the power lead from the power inlet of the transformer.
2. Carefully remove the fuse holder using the tip of a flat head screwdriver.
3. Discard the active fuse and replace with the spare fuse. Figure 17 above.
4. Push the fuse holder back into the slot below the power inlet.
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