User guide

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144 | Performance Series HQA Digital Video Recorder User Guide
Guidelines for Connecting Alarm Input Ports
• Ground alarm inputs. Choose from normally open (NO) or normally closed (NC).
• Connect the COM end and GND end of the alarm detector in parallel. Supply external
power to the alarm detector.
• Connect the ground of the DVR and the ground of the alarm detector in parallel.
• Connect the NC port of the alarm sensor to the DVR alarm input.
• Use the same ground as the DVR if you are supplying external power to the alarm device.
Guidelines for Connecting Alarm Output Ports
• Provide external power to external alarm device.
• To prevent overloading, carefully review the following relay specifications:
Material Nickel/silver contacts with gold plating
Rating (Resistance
Load)
Rated switch capacity 30 V DC 2A; 125 V AC 1A
Maximum switch power 125 V A, 160 W
Maximum switch voltage 250 V AC; 220 V DC
Maximum switch currency 1 A
Insulation
Between touches with same polarity 1000 V AC/1 minute
Between touches with different polarity 1000 V AC/1 minute
Between touch and winding 1000 V AC/1 minute
Surge voltage Between touches with same polarity 1500 V (10 × 160 us)
Length of open time 3 ms maximum
Length of closed time 3 ms maximum
Longevity Mechanical 50 ×106 times (3 Hz)
Electrical 200 × 1030 times (0.5 Hz)
Temperature –40°F to 158°F (–40°C to 70°C)