Procom Controls
Occupancy Light Level Dimming
Typical Office Layout
| Siting the Controls for Best Usage Above is a drawing representing part of a building. The various rooms are labelled with their functions and the most suitable sites for the different variants of Procoms controls will be mapped and explained in detail in the following paragraphs. The red circles only indicate the coverage of the units and are not calibrated. All units and systems have PIR occupancy detection, Photo-Darlington light level detection and Active Infra-Red configuration and control |
The Sales Office
| The Sales Office (12ft. x 10ft.) Small rooms like this can often be covered by a single PROSC1 or 2, combined ceiling unit. This stand alone control has a range of 2.5 times the ceiling height to a maximum of 7 metres diameter and is omnidirectional. The switching capacity is 8 Amps inductive and can easily handle a couple of standard twin fluorescent fittings which would give more than adequate illumination here. The unit should be fitted directly above the desks and as central to the room as possible. |
Main Office
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The Main Office (13ft. x 13ft.) This room is slightly bigger than the sales office |
but can still be covered by a single PROSC1 or 2. The maximum sensitivity is directly beneath the sensor, so, providing that the desk is near the centre of the room, then areas up to the 7 metres maximum are no problem. If the desk were sited to one end or corner then in order to ensure that the lights would behave correctly the hold-on time may need to be increased. This hold-on time is the time delay between the last occupancy detection and the actual switch off of the lighting. Normally this would be left at the factory setting of 4 minutes, but 8 or 16 minutes delays may be selected insteadWorkshop
the main windows. As the window area is so large in this room and the room itself is also large, a PROSC3, combined wall unit, as it can cover a 12 metres area at 120 degrees, is used in the corner by the window. The version of this stand alone unit used, the PROSC3/B has 2 relay outputs of 8 Amps inductive capability each independantly controlled by their own light level. As the ambient light level falls the lights by the inner wall come on first and if the light level continues to fall the lights by the windows come on. The two rows of lights are both occupancy controlled as well. On all units and systems the light level control may be removed and the units set to occupancy only. Light levels are set by the installers or the customer when the appropriate ambient light level is reached using the infra-red control system Stock Room
racking around the walls. A PROSC1 or 2 is used in the centre of the room and this is adequate even though the racking and the stock on the racks could mask personnel from the sensor. The small size of the room means that the masking effect would be very limited and any problems could be removed by adjusting the delay time. The sensor has direct line of sight of the door and would always trigger when the door was openedStore Room
Stores (18ft. x 12ft.)
In the stores the problem of racking is more troublesome. The size of the room is more suitable to a PROSC1 or 2. This, however, would be severely 
masked by the racking. A single PROSC1 or 2 will not cover the area. The depth of the room would suit a two light zone unit but a wall unit cannot be used.
The PROMODULAR Area Control System is the prefered choice. This normally consists of a PROM1, system power controller, plus an PROHDMST, system master sensor, plus up to ten PROHDSLV ceiling or wall slave sensors as needed to cover the area concerned.
Lobby and Corridor
the awkward size and shape, is another case for a system. This is a standard system for there is no advantage to light zoning. A master sensor is used to cover the lobby but a wall sensor covers the corridor because the shape matches the distance of the wall unit. One feature of systems, known as corridor link, enables one system to act as an input into another systems’ master sensor. Thus, if the corridor is required to be lit when the offices are lit, the offices would be fitted with minimum systems (one PROM1 plus one PROHDMST. The low voltage corridor link would then turn on the corridor lights when the office lights were on, but NOT vice-versa. This one-way light control is also used in open plan situations with a ‘notional’ corridor and set open areas. 