Redwall LRP3020, Инструкция по установке, Страница: 4 / 8

For outdoor installation, steel conduit or armoured cable is recommended.
Long cable runs between the power supply and the unit should not result in a total conductor resistance
greater than 20 ohms (10 ohms per conductor). The voltage drop between the power supply and the
detector should not be greater than 0.5Volt. The voltage at the detector terminals should not be less than
11 volts and ideally be higher than 12 volts. For ‘H’ heater models assume 250mA (.25A) for voltage drop
calculations and ensure cables have a resistance, less than 4 ohms (2 ohms per conductor).
If screened cables are used, ensure that the screen is connected to the negative terminal.
NOTE: The metal housing and bracket of the detector is connected to the negative supply terminal, this
means that the power supply negative will be grounded at the detector. In some long distance installations
ground-loop currents may flow if the power supply is also grounded locally.
The ‘&’ ‘OR’ logic selector switch (see Fig.4.) should be set downwards for most installations. This is the
recommended setting for outdoor use, particularly where there may be large animal movements. With this
setting, channel ‘A’ AND ‘B’ must have an ‘event’ within 10 seconds of each other to produce an alarm.
For indoor use, or where the highest security is required, the switch should be moved up. With this setting
an ‘event’ in either ‘A’ OR ‘B’ will trigger an alarm condition.
Double-check all connections before powering the unit.