KH1
Product Guide
Series of Electronic Time Lag Switches
KH1 time lag switches are a quick and effective way to reduce energy consumption for lighting applications. Pressing the button brings the lights on;
the lights will then switch off automatically after a preset time period has
elapsed.
These units do not require a neutral connection, therefore they can be used
to replace an existing light switch. The duration of the time delay is set by a
thumbwheel on the revers e of the unit.
The KH1 series comes with extra terminals to allow slave switches to be
connected to the system to trigger the timer.
The KH1N has an illuminated push button to allow the unit to be located in
the dark.
Time lag switches can be used in two way and intermediate switching arrangements without any extra wiring.
Overview
Wiring
Conventional Wiring
Wire the KH1 as in diagram 1. When using multiple switch positions
see diagram 2.
For two way and intermediate switching follow the diagrams overleaf. Note that as long as each switch position has a Live feed and a
Live Out connection to the load then the switch will be properly
wired.
Using Slave Switches
Where slave switches are used follow diagram 3. Limit the cable run
between the slave switches and the timer to 25m.
Note that the slave switch must connect directly to the terminals.
Putting Live, Neutral or Earth on the terminals will damage the unit.
Slave switches with integral neons will only work if the neons are
supplied separately with a Live and Neutral connection.
Diagram 1
Conventional
wiring
Installation
Warning. This device works at mains potential. Be sure to take care when
working with electricity.
1. Make sure the load is connected and in working order.
2. Isolate the mains supply to the circuit at the main consumer unit.
3. Connect the controller via the terminal block. Live supply to the L terminal and the load to the LIVE OUT terminal.
4. Connect the slave switches if using.
5. Push the override switch to the off position (see diagram).
6. Set the timing range using the thumbwheel. Turn clockwise to increase
timing.
7. Screw the unit to the wall and switch the mains supply back on at the
distribution board.
8. Wait 20 seconds before pushing the button
9. Push the button and the lights will come on
10. Wait for the time period and the lights will turn off again.
Diagram 3
Slave switches
Diagram 2
Multiple switch
locations
Fault Finding
Specification
LIGHTS DO NOT COME ON
Check to see if the live supply to the circuit is
good. Strap across the L and LIVE OUT terminal to turn the load on.
LIGHTS DO NOT GO OFF
Ensure that you have waited for the time out
period.
If the lights still do not go off then it is likely the
unit was not given the 20 seconds start up period on installation. Follow this procedure:
1. Isolate the mains supply to the circuit at
the main consumer unit and unscrew
the unit from the wall.
2. Push the override switch to the off position.
3. Reapply the mains and wait for 20 seconds.
4. Push the button for operation.
LIGHTS FLICKER
Ensure that there are sufficient power factor
correction capacitors fitted.
LOAD
10A of lighting including incandescent, fluorescent, compact fluorescent, low voltage (switch
primary of transformer).
Fluorescent and compact fluorescent fittings with “switch start” ballasts - 10 ballasts maximum.
Power factor correction capacitors must be fitted.
Most fluorescent fittings have power factor correction capacitors fitted. If they are not present
the unit may fail to turn off properly or flicker. In this case fit one capacitor per circuit with a
minimum value of 1μF for every unit installed. The capacitor should be fitted across switched
live and neutral. Note that it is not necessary to fit a capacitor on every fitting. This also applies
to fittings controlled with high frequency ballasts and maintained emergency fittings.
Not suitable for switching contactors
Not suitable for SON lighting
Not suitable for heating or ventilation loads.
Please contact our sales department for a suitable alternative product.
SUPPLY VOLTAGE 220-240 Volts AC 50 Hz
TIME OUT PERIOD 20 seconds to 20 minutes (approximate)
FIXING METHOD Surface fixing 25mm deep plastic surface mount moulded box.
Flush fixing 25mm steel wall box or 32mm deep cavity wall box.
TERMINAL CAPACITY 1.5mm2
MATERIAL Flame retardant ABS
TYPE Class 2
TEMPERATURE -10°C to 35°C
CONFORMITY EMC-2004/108/EC
LVD-2006/95/EC
Part Numbers
KH1 Electronic time lag switch
KH1N Electronic time lag switch with neon locator
SLV1 Slave switch
SLV1N Illuminated slave switch (requires separate Live and Neutral connection)
IMPORTANT NOTICE!
This device should be installed by a qualified electrician in
accordance with the latest edition of the IEE Wiring
Regulations and any applicable Building Regulations.
FM 45789 EMS 534520
Due to our policy of continual product improvement CP Electronics reserves the right to alter the specification of this product without prior notice.
C.P. Electronics Ltd
Brent Crescent
London
NW10 7XR
United Kingdom
Tel: + 44 (0) 333 900 0671
Fax: + 44 (0) 333 900 0674
www.green-iswitches.co.uk
enquiry@green-iswitches.co.uk
Ref: #WD019 Issue 7
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