7
Dual Zone Digital Location Control Unit Installation and Operation Manual
Physical and environmental
Enclosure
Plastic enclosure with clear plastic lid fitted with
membrane label
Material
Polycabonate
Colour
Light grey (RAL 7035)
Dimensions (H × W × D)
180 × 120 × 60.5 mm (7.1 × 4.72 × 2.38 in.)
Cable entries [1]
2 × M16 × 1.5 threaded gland holes
4 × M12 × 1.5 threaded gland holes
Operating temperature
–20°C to +50°C (–4°F to 122°F)
IP rating
IP65 (NEMA 4, 4X)
[1] Cable glands not supplied
Status indications
Display
2-line, 16-character backlit display
LED indicators
Power
Alarm
Fault
1 × green LED
2 × red LEDs (1 per zone)
2 × amber LEDs (1 per zone)
Internal buzzer
92 dB(A) at 10 cm, 2.4 kHz, pulsed signal (operates
during alarm and fault conditions)
Operating modes
The control unit can operate in two different functional modes: Independent or
Interlock, providing added flexibility to LHD system design. More information on
each mode is provided below.
Independent mode
In this mode the control unit operates the two LHD zones as completely
independent detection circuits with independent status outputs.
This provides the following advantages:
• Protection of two risk areas with two sensor cables through one control unit
• Protection of one risk area with two detection zones
• Protection of one risk area as one detection zone with two different
temperature sensor cables providing a pre-alarm and alarm system
