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Operations Manual

Model NT11 & NT11-E

June 18

th

2002

3609 North 44

th

Street Phoenix, AZ 85018-6023

www.northstarcontrols.com

Fax:

(941) 426-0807

Tel:

(941) 426-6396

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Summary of Contents for NT11

Page 1: ...Operations Manual Model NT11 NT11 E June 18th 2002 3609 North 44th Street Phoenix AZ 85018 6023 Internet www northstarcontrols com Fax 941 426 0807 Tel 941 426 6396 ...

Page 2: ...e 4 Connections Page 6 Theory of Operation Page 6 Block Diagram Page 7 Detailed Description of Operation Page 7 Parts List Page 9 Schematic Page 10 Glossary d c Direct Current DIL Dual In Line led Light Emitting Diode Megger Meg Ohmmeter msec millisecond pk pk Peak to Peak uH Micro henry uF Micro farad Page 1 ...

Page 3: ... and a space indicate a greater than 25 inductance change The NT11 and NT11 E are fail safe detectors so in fault they will provide a constant output until the fault is cleared Characteristics NT11 and NT11 E Operating mode Presence 15 minutes Short 120 minutes Long Pulse 125ms 25ms Pulse paralysis When used in pulse mode a pulse paralysis time of two seconds is incorporated to prevent multiple pu...

Page 4: ...nsions are 5 5 D x 5 5 H x 2 W excluding connector Weight 1 lb Indicators Front panel indicators include Detect Red solid during detect and flashing to indicate extend or delay operation Fault Yellow solid for current or flashing for historical fault Fault sequence is related to type of fault sensed 1 blink and 1 space Open 2 blinks and 1 space Short 3 blinks and 1 space 25 inductance change Insta...

Page 5: ...ed lead in s are not essential but are recommended especially on longer runs Loop and lead in should have an insulation resistance to ground greater than 50MΩ measured at 500V and a series resistance of less than 10Ω Loop size and location are a function of application and are dictated by experience Northstar detectors will handle a wide range of loop and lead in systems Adjustments NT11 and NT11 ...

Page 6: ... 56 Setting 1 1 28 Setting 2 96 Setting 3 64 Setting 4 48 Setting 5 32 Setting 6 24 Setting 7 16 Setting 8 12 Setting 9 08 Setting 10 06 Setting 11 04 Setting 12 03 Setting 13 02 Setting 14 015 Setting 15 01 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Sensitivity DIP switch positions shaded area Page 5 ...

Page 7: ...changes causing the frequency of the oscillating signal to change and providing a means to determine the presence of the vehicle Transient protection elements are incorporated within the oscillator to prevent large transients from causing damage to the oscillator or other electronics Frequency switches accessible from the front panel allow the operating frequency of the oscillator to be modified t...

Page 8: ...tional mode is required Then the loop oscillator is activated to obtain a sample of the loop frequency When the loop oscillator is activated the combination of the inductance of the road loop and the added capacitance within the oscillator circuitry produces a resonant frequency The oscillating signal in the road loop sets up an alternating magnetic field surrounding the loop itself When the condu...

Page 9: ... frequency due to environmental drift are programmed out allowing the direct comparison of fast changes due to the entry of a vehicle in the detection zone Once a period shift exceeding the detection threshold set by the sensitivity level occurs the output and detect indicator for that channel are activated The Operational mode that was set on the front panel switches will determine whether a sing...

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