Two Supplies Equally Likely To Drop Out; Supply Failure Detection Mode - Honeywell Ex-Or CDH4U5 Installation And Commissioning Instructions

4-channel programmable intelligent lighting control module

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Table of Contents

c) Two Supplies Equally Likely to Drop Out

SUPPLY 1

N2 L2

Changeover

Contactor

As shown in the diagram above, two equal supplies may be connected from a single phase or different phases. In order to maintain constant supply to the unit an

external change-over contactor* is required. Line terminals from each of the supplies (N1, L1 and N2, L2) are connected via the change-over contactor. The

Live and Neutral outputs from the contactor are connected to the mains input of the unit. In the case of failure of one of the supplies, the change-over contactor

switches to the alternative supply to ensure continuous supply to the unit. As shown in the diagram above, one or more channels may be wired to run from either

supply.

* Such as Lovato BG series mini-contactor.

Note: Please refer to AN4027 for recommendations on wiring supplies to the change-over contactor and part number.

Supply Failure Detection Mode

MAINS INPUT

+ 1 -

+ 2 -

+ 3 -

+ 4 -

DIMMING CHANNELS

Channel 1 & Channel 4 are equipped with three-wire pluggable terminals with provision of connecting Neutral and Live from each supply. On detection of supply

failure on Channels 1 or 4, the unit enters into special operating mode. During this mode, the unit controls the output of luminares connected to the channel(s)

fed by the remaining supply according to the settings of Scene 5. During this special operating mode, the unit will continue to respond to switch inputs and

occupancy detection. The unit automatically reverts to normal behaviour once the failed supply has been restored.

Note: Please refer to the Commissioning section for programming the channel output settings of Scene 5.

CH1

Ballast