Timeguard ZV700B

[Frank]

Has anyone any experience of installing a Timeguard ZV700B?

I've replaced a standard wall switch with one and the 7W LED lamp it feeds has a gentle glow. The Timeguard instructions say it takes four hours to charge its internal battery (though I've seen 24 hours mentioned elsewhere). Could that be the reason for the glow as it's only been in an hour or so?

[Andy Burns]

It says "2-wire no neutral required" so it's vampiring its own power through the lamp, for an LED that could be enough to make it glow, or flash at intervals ... try a different LED lamp (if the current one is dimmable try one that isn't or vice-versa).

[alan_m]

Last line of page 3 in the manual.

Quote Note, the ZV700B is not designed for use with LED or discharge lighting.

[Andy Burns]

The manual I read said LEDs were supported ... from the horse's mouth

"LED Lighting: Minimum 5W (individual) Maximum 20W total load (Each 5W minimum)

The LED switching capabilities of this product can be increased to 200W by the addition of the Timeguard ZV900 Automatic switch load controller"

[Frank]

Thanks, I replaced the LED with an incandescent which flickered slightly and couldn't be turned off until the unit was fully charged when it when off of its own accord. I set the the Timeguard up and it worked as it should.

Replaced the incandescent with the 7W LED and I get a single flash when I turn the light on, then the glow returns. I'll find and try another LED tomorrow as you suggest.

[Frank]

I can assure you it is designed for LEDs. The manual says so and so does Timeguard's Technical Department.

The ZV700 the B replaces was not

[Brian Gaff]

Could you have one of the older designs? There seem to be any number of suggested fixes for this in LEDs, from a resistor across the lamp to using a relay. Brian

[alan_m]

The Timeguard suggested solution is to buy another module at around £20.

This product requires to be permanently charged which is achieved through the switched Live. As such, some LED and CFL lamps may glow or flash whilst this product is in the “OFF” status. This glow/flash can be eliminated by adding the Timeguard ZV900 Automatic switch load controller to the circuit. The ZV900 is sold separately

[Frank]

The ZV700B is the latest version designed for LEDs.

[Frank]

Thanks, I'm aware of that but Timeguard Technical say it shouldn't need the ZV900.

[alan_m]

If you look at the reviews on Amazon you will find that nearly everyone says they don't work with LEDs including those who have subsequently purchased the ZV900. The reviewers all complain about glowing and flashing lights when the switch is on the off position.

There may be some LED bulbs they do work with but, in general, you have no way of knowing what configuration of electronics in the base of the bulb has been used unless you take one apart. The electronics may be a simple capacitor current limiter or maybe a rarer switched mode supply, or something else. There is also a indication that if there is more than one bulb on the switch they may have to be all the same

[charles]

Light bulbs usually say "dimable" or "non-dimable". It's probably the dimable ones that are OK. Mind you, when you fitted the bulb a year or so ago, and thrown away the packaging, you will have forgotten which type you have.

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[alan_m]

Dimmable may not solve the problem

The problem is similar/identical to

In the case of the Timeguard switch the problem is worse because by design the switched live is never truly turned off. A small current flow is needed to keep the battery topped up and this small current is likely to be more than described in BigClive's video. This current always flows through the LED lamp. In the case of a dimmable LED lamp it will still see the full cycle of mains or equivalent to a full brightness setting on a dimmer switch, albeit with limited low current in the case of the Timegaurd switch.

The video possibly explains why the people who subsequently purchased the Timeguard ZV900 Automatic switch load controller at £20+ had no luck in solving the problem. The zv900 is likely to just be a electronic relay as shown in the video.

[nib]

Possibly slightly different problem, but when I wanted to use an electronic switch with no neutral, ie one powered by a small leakage current through the load when off, with a CFL bulb which didn't conduct at all until it ignited, I used a small AC capacitor across the lamp, the type often used for interference suppression. That worked well enough.

Maybe it would leak enough through to keep your LED bulb from flickering.

nib

[Frank]

A Morrisons 13.6W dimmable is the answer.