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CROSSTALK
Crosstalk happens when several MultiMate™ circuits are installed in
the same building, and adjustments on one circuit cause interference
on another circuit. The interference may be observed as:
-
Lighting changes on one circuit cause lighting changes (on / off
/ change of level) on some other circuit; or
-
Lighting changes on one circuit cause another circuit to turn
off.
If a lighting load is flickering or flashing at low dimming levels or when
turned off (and no dimmer / timer / switch is being adjusted) the most
likely cause is a poorly designed lighting load. In that case, please refer to the section "Flickering or flashing
when off or at low dimming levels".
Causes
If the mains supply has a high source impedance, this can cause crosstalk: where the communication of one
set of dimmers interferes with adjacent dimmers – especially if the different dimmer circuits share a
common active feed to the same switch plate.
Reasons for High source impedance may include one or a combination of:
•
Old substation or local step-down transformer running close to maximum capacity;
•
Long cable run from step down transformer to building;
•
High resistance terminations on active feeds and/or neutral returns; and
•
Neutral returns from a common active feed having significantly different run lengths back to the
switchboard – good practice would be to link together neutral returns from a common active feed as
close as possible to the loads.
A best practice is for wiring from the distribution panel to the multi-way control location to use twin &
earth cabling, keeping active & neutral together for as long as possible. This results in the lowest supply
impedance. Long runs of single-cable active wiring and separate neutral wiring should be avoided.
Solution when the Multi-way function is not required
If the multi-way dimming function is not being used: follow the directions in the product Setup Guide to
disable the MultiMate™ operation. This prevents the dimmer / timer / switch / sensor from sending and
receiving the MultiMate™ commands.
Change this setting for all affected dimmers in the building when multi-way dimming is not needed.
Solution when the Multi-way function is required
When the multi-way dimming function is required, an inline MMDM/ID Inductive Decoupler may be
required – these should be connected between the last dimmer in the control chain and the load.
Neutral
Active
SINGLE ACTIVE FEEDING
SEVERAL DIMMED CIRCUITS
13-14-031D-20-01 – Issue 1
RED Strapper
White Strapper
October 2020
LEDsmart+ / MultiMate™
Troubleshooting Guide
LAMP
LOAD
MMDM/ID
LAMP
LOAD
MMDM/ID
LOADS
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