The TD250 is designed for ease of installation with front panel switches for setting presence times and sensitivities and operating frequency plus four operating modes.
It provides outputs in the form of LEDs on the faceplate and change-over relay contacts. A common fault relay provides an output in the event of a faulty loop or a power failure.
Two main models are available, both providing the option of 2 separate vehicle presence outputs per channel plus 3 further operating modes:
The TD250D provides: Direction Logic (AB), Delay Mode, Extend Mode
The TD250L provides: Direction Logic (AB), Speed Logic, Headway Logic
An output will be provided when pre-set speed or headway threshold has been exceeded, and can be utilised for switching variable warning signs or for gathering traffic statistics.
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Self-tuning range: | 15 to 2000μH |
Sensitivity: | Four step selectable: High 0.02% DL/L Medium-High 0.05% DL/L Medium-Low 0.1% DL/L Low 0.5% DL/L |
Frequency: | Four step switch selectable - 20 to 150 kHz (Frequency dependent on loop geometry) |
Presence Time: | Four step selectable: 1 Second, 4 Minutes, 40 Minutes, infinity |
Pulse: | Output Approximately 150ms |
Indications: | 1 x Run Indicator – Red Steady On 1 x Tri-coloured LED per channel |
Detect Outputs: | Sealed relays rated at 1A @ 220V AC Single changeover contact per channel |
Output Relay: | Mode Switch selectable (Presence relays are fail-safe) 1. Normal (Presence) 2. Direction Logic 3. TD250D – Delay; TD250L- Speed |
Fault Output: | Common fault output Change over relay contact |
Reset: | Push button on front panel |
Delay Timings: | Delay turn-on 30 seconds in 2 second steps |
Extend Timing Delay: | Turn-off 7.5 seconds in 0.2 second steps |
Delay Extend Override: | 230V AC input overrides delay times |
Speed Logic Option: | 0 – 150kph in 10 kph steps |
Headway Logic Option: | 0 – 3 seconds in 0.2 second steps |
Surge Protection: | Loop isolation transformers, Zener diode clamping on loop inputs and gas discharge tube protection |
Power requirements: | TD252, TD250L: 230V AC +/- 15% (48 to 60Hz) TD254: 24V DC +/- 15% 150mA maximum input current |
Operating Temperature: | -40°C to +80°C |
Humidity: | Up to 95% RH without condensation |
Housing material: | ABS blend |
Mounting Position: | Shelf mounting |
Connections: | TD252 / TD250L 2 x 11-pin submagnal type |
Accessories: | All flying leads supplied |