electrical

The Low Down On Time Delay Switches

LSTDE-L & MLCD

The GEO Series electronic time delay switch 240V offers a unique set of features such as the capability of being used in 2 or 3 wire mode (with or without neutral), two type program settings, time out range from 30 seconds up to 259 minutes, and an illuminated button indicator. There can however, be some confusion as to how these products should be installed that need be clarified! Let us explain the requirements of operation, and how these should and shouldn’t be wired.

The most important stuff first…

1 In all 2 wire applications where a neutral wire is not connected to the product, for the product to operate correctly, a minimum load of 35W must be connected to the LOAD side to ensure that a minimum current is available to power the microprocessor in the OFF state. If the minimum LOAD requirement is not achieved, then the product will not function correctly, if at all.

If a minimum connected LOAD of 35W cannot be achieved, then a load correction device must be wired in parallel to the connected LOAD. Connected Switchgear now offers a simple 2 wire load correction device (MLCD) that is compatible with all electronic switching devices, including our very own electronic time delay switch.

If the product is installed using the 3 wire method where a neutral wire is connected to the product, then the minimum load requirement is no longer necessary.

2 As an electronic relay switching device, it is imperative that the installer ensures that the combined inrush current load does not exceed the 10A rating of the relay. Failure to do so will reduce the life of the relay contacts and void warranty.

Here’s an example: let’s assume that the installed environment is switching 25 x 10W LED globes, meaning a combined total of 250W, the installer may assume that the connected load value falls way under the maximum rating current of the relay of 10A. However, what is not advertised on the LED globe packaging is the total power requirement (or inrush current) of the globe and in some instances can vary from almost 0 to as much as a factor in excess of 100. We have seen 7W LED globes with an inrush current as high as 50A! Imagine connecting 25 7W LED globes that have a total combined inrush current of 1250A!

What adds to the frustration is that manufacturers do not advertise this inrush current value on the product packaging. What we have experienced is that there is a link between cheaper alternative LED globes and higher inrush current values, so our recommendation is to stay away from the bottom end of the market when purchasing LED globes.

CSG is currently developing two new products that will eliminate this field problem related to electronic switching devices.

3 When the installation environment requires more than one switching point location, you cannot use 2 time delay switches to operate the one load. In this application, the installer must connect an AC type “momentary” press mechanism to the optional control switch terminal on the rear housing of the time delay switch.

Every time delay switch comes with an instruction sheet or can be downloaded from our website. We get that you are an experienced tradie and may have installed many electronic switching devices before, but each brand of product is unique. So don’t think you know it all and throw it out. Be sure to download and read the instructions carefully to see if this product is right for you.

Next, let’s discuss time settings…

Time out settings (ranging from 30 seconds to 259 minutes) are made by removing the front cover plate to access the micro switch toggles. There is no need to remove the switch plate from the wall. A total of 8 pre-set time out settings are available depending on the micro switch toggle set position, so follow the instructions to set the specific time out required. Type A and B programs allow a variety of installation and performance options:

Type A setting will commence programmed time out period each time the button is pressed. In the event that the button is pressed again prior to the pre-set time out, the program will recommence time out period again.

Type B setting will commence programmed time out period when the button has been pressed from the OFF position. If the programmed time out period has not expired when the button is pressed again, the programmed time out is cancelled and the switch is powered off.

Now, let’s talk specs…

Contact Status:                                    Normally Open

Connection Type:                                2 or 3 Wire (optional neutral wire)

Supply Voltage:                                   240V AC

Frequency:                                            50Hz

Max Current:                                         10amp

Over Temp Cut Out Current:          12amp

Max Load:                                              2500W (Incandescent) 2500VA (Fluorescent)

Minimum Load:                                   35W (when no neutral terminal)

Operating Temperature:                 0 to 50°C

Cycle Timer Range:                           30 seconds to 259 minutes

Factory Setting:                                  30 seconds, Type A Program

Electrical Safety Tips At Christmas

Electrical incidents kill or injure around 16 Aussies each week, with 13% of these incidents involving children under the age of 14. These statistics increase during the holiday season, so electrical safety must always be top priority. Stay safe this holiday season with this electrical safety checklist:

1. Check the compliance of all electrical products

The market is saturated with electrical products that are not compliant with Australian Safety Standards, including Christmas decorations. Be alert to these, and know what to look out for. When looking for electrical decorations, always choose products with an Australian Product Approval Number or RCM (Regulatory Compliance Mark).

2. Manage cables correctly

Extension cords and boards can be a hazard, so plan how you are going to use them. Make sure leads are always taped to the floor and are carefully placed around furniture to avoid anyone tripping over them. Don’t place them anywhere they could overheat and potentially melt, especially near heaters. Use a longer extension lead if necessary, instead of connecting multiple shorter cords. Avoid ‘piggy backing’ adapters. Use Australian approved extension cords with three pins, as two pin extension boards are not earthed, meaning it is less safe.

3. Install a safety switch

It’s always a good idea to install a safety switch in your meter box as they automatically monitor the power output of your line and will cut off the power if it detects anything unusual or harmful. It may cost a little extra, but your safety is more important than your back pocket.

4. Water and electricity do not mix

Water and electricity are a lethal combination. Never leave appliances anywhere they could be splashed by water, for example a sink or bathtub. Turn off all electrical appliances after use and don’t clean on or around electrical accessories such as power outlets and light switches with a wet cloth, household cleaners or detergents. Sounds logical, but the number of incidents involving water and electricity are alarming.

5. Turn off all lights and electrical decorations

When your Christmas lights and decorations are not in use, turn them off and unplug them, especially before going to bed. Never leave the lights on overnight.

6. Don’t let electronics overheat

In the summer time, electronics can easily run hot, so it’s important that you always check they’re not too hot, otherwise they could overheat and become a burning hazard. On those hot summer days, check how much heat is radiating from the back of your electronics, like computers. If it becomes too hot, ensure that it is not near anything that could melt. Even better, turn off and unplug the electronic device so that it doesn’t overheat. Better to be safe than sorry!

References:

(a) Energy Safe Victoria

(b) Platinum Electricians

(c) Budget Direct