MS Electronics RTDS3 User manual

Product Guide
RTDS3
today, tomorrow and in the future
mselectronics.co.uk
Remote Time Delay Switch
3-wire version
energy saving controls
Issue 1.0

RTDS3
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Product Overview
The RTDS3 Remote Time Delay Switch provides timed switching for lighting, heating, air
conditioning and ventilation equipment, to be used with a separate switch or interfaced
to a control system such as a building management system (BMS). Housed behind a
vandal-resistant bare faceplate, the unit is operated by a momentary contact closure input,
offering remote activation of the connected load whilst saving energy by switching it off
automatically when not required (after an adjustable period). At any time, the activation
period may be extended with a further brief contact closure, or cancelled by an extended
closure. The unit is available with different time delay ranges (see Technical Specication).
The unit is simple to install and ts a standard single-gang UK pattress or back box (20mm
min. depth). Ideal applications include small booths or rooms, workshops, entrance halls,
staircases, toilets, store cupboards, hired sports courts and rooms plus many more.
Figure 1 RTDS3
Figure 2 Typical wiring example and dimensions (in millimetres)

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Electrical Requirements
Before attempting to install the unit, ensure that the intended load and wiring arrangement
comply with the following requirements. Figure 2 shows a typical wiring example.
• 3-wire (live/neutral + volt-free switch) connection: The unit requires a permanent
live/neutral connection, and as such is not suitable for replacing an existing light switch
with no neutral conductor at the switch location. A volt-free relay output is provided,
which can be used to switch a load on the same mains supply (by connecting across
from Lto LIVE IN, making LIVE OUT a switched live), or to provide a contact closure to
a separate load or control signal. There is no minimum load requirement.
Also available: RTDS2 (2-wire version) – Suitable for ‘inline’ connection with the load to
be switched (no neutral required), such as to replace a standard light switch. A minimum
load of 20W (per switch unit) applies; a load capacitor is required for smaller loads.
• Maximum load: The maximum load rating is 16A (4000W), however for high inrush
loads (such as most types of lighting), a lower limit applies: see Technical Specication.
• Remote Input: The unit is operated by momentary contact closures across the R+/R-
terminals (see Figure 2) according to the operating sequence (see Operation). At least
one appropriate switch or relay must be connected in accordance with the Remote Input
Wiring section. All wiring must be rated for mains voltages, and relay operation must
conform to the specied timings (see Technical Specication).
The remote input connections are referenced to the mains supply of the unit and are therefore not
safe to touch when the unit is powered. All switches and cables must be rated for mains voltages.
!

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Remote Input Wiring
Up to ve inputs may be connected in parallel to control the unit. Each input device may be
either a volt-free relay output, a normally-open mechanical switch (such as a pushbutton or
retractive rocker), or a TDS-S slave unit, which provides a touch-sensitive button.
Do not apply any voltages to the remote input terminals.
!
The following wiring example is intended only as a recommendation. Proper wiring practice must be
observed with relevance to the particular installation.
!
Referring to the steps under Installation, connect the remote input(s) as follows.
• TDS-S: Use 3-core mains-rated cable and connect as shown below. Figure 3 illustrates
a typical wiring example using two TDS-S slave units; Figure 4 represents the same
conguration as applied to a typical ceiling rose lighting circuit.
• Relays and other switches: Use 2-core mains-rated cable and connect to the R+ and
R- terminals only (polarity does not matter); do not use the V+ terminal.
Figure 3 Typical wiring schematic using two TDS-S slave units
Figure 4 Typical ceiling rose plan using two TDS-S slave units

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Installation
All electrical installation and maintenance must be carried out by a competent person. If in doubt,
consult a qualied electrician. Any new wiring must be carried out by qualied personnel in
accordance with the current edition of the IET Wiring Regulations (BS7671).
!
Ensure the electrical supply is isolated before making any connections or adjustments.
!
1. Prepare a single-gang pattress or back box as necessary.
2. Rotate the Timeout thumbwheel (referring to the accompanying label) to set the period
of time for which the load should remain switched on after a contact closure trigger.
3. Connect the wiring as shown in Figure 2 (or in any suitably appropriate form).
− Supply connections (L, N): Use appropriate mains cable to power the unit. If the
load is also powered via this wiring, ensure the current rating is adequate. Otherwise
(i.e. if the output is independently powered), low-current cable may be used.
− Load connections (LIVE IN, LIVE OUT): Use cable rated for the load current and
voltage.
− Remote input connections (V+, R+, R-): Low-current cable may be used but must
be rated for mains voltages. Refer to Remote Input Wiring for wiring details for
different input devices.
4. Fix the unit into position with the two screws and caps supplied.
Additional Guidelines
• The screw caps may be removed at a later date with the aid of an adhesive putty such
as Blu-Tack.

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Operation
The diagram below illustrates the sequence of operation for the unit.
Key
Sequence of
Operation

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TechnicalSpecication
Power supply 220V - 240V AC 50Hz (live/neutral)
Output switch type Volt-free SPST (normally open) relay
Output switch rating 16A, 250V AC (resistive)
Maximum lighting load
Incandescent: 12A (3000W)
Fluorescent: 10A (2500W)
Compact Fluorescent: 10A (2500W)
Remote input type Non-isolated, momentary (normally open)
Remote input contact closure timing Brief (on/reset): 50ms < t < 700ms
Extended (off): t > 1000ms
Time delay selection
3 seconds to 30 minutes or
6 seconds to 60 minutes or
12 seconds to 120 minutes
Mounting hardware 20mm (min.) single-gang UK pattress box
Operating temperature -10°C to +40°C
Guarantee 5 Years
Weight 87g
Dimensions 86mm x 86mm x 27mm
Fault Finding
Ensure the electrical supply to the unit is isolated before making any adjustments.
!
Load will not switch on
a) Unit is not powered
• Ensure the unit is correctly connected to an active mains supply.
b) Load is not connected correctly
• Ensure the load is connected appropriately. The relay output is volt-free so must be
connected suitably to a supply in order to power a load.
• Check that the load works on its own by bypassing the time delay switch.
c) Remote input is not recognised
• Ensure the input device in use is supported and is correctly connected: see
Remote Input Wiring.
• Check that the input device (switch or relay output) operates correctly without the
time delay switch connected. For relays, ensure that the contact closure action
conforms to the specied timings (see Technical Specication).
Loadswitcheson,butdoesnotswitchoff(orlightingloadickers)
• Ensure the set period has elapsed since the last remote input contact closure.
• If attempting to cancel the activation period, ensure that the remote input contact
closure action conforms to the specied timings (see Technical Specication).

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energy saving controls
Technical Support
For further help or information on this and other products in the MS Electronics range
visit www.mselectronics.co.uk or call 0333 666 1176.
Alternatively, email [e-mail]
Additional copies of this product guide can be downloaded from our website.
Product Warranty
MS Electronics guarantees all their products against manufacturing defects for
5 years from the purchase date. If your product is found to be faulty, MS Electronics will,
at their discretion, repair or replace the product free of charge.
Note
Any modification or damage to the product including damage due to abuse or
incorrect wiring may invalidate the guarantee.