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The detector self calibrates to the ferrous footprint and lead-in wires on power up. DINKY's advanced firmware ensures it is imune to crosstalk interference from similar detectors. There is a sensor routine to detect ground loop open circuit and short circuit faults. The volt free formC relay provides 1000V isolation for your equipment protection. All DINKY pcb's are encapsulated in rubber compound for IP67 protection. DINKY has been serving the vehicle access market for over 20 years. It will be your last best choice.
Specification
Loop inductance
20µH to 1500µH (incl lead-in inductance)
Operating Temp
-37°C to 74°C
Operating Voltage
10 to 30 volts AC or DC,
Operating Current
1 mA standby
Dimensions
39 (H) x 74mm (W) (inc feet) x 40mm (D)
Relay contacts
1 amp @ 125VAC max, Form C
Dinky module selector
Module
Application
Features
VD906
Fail secure exit sensor
Single sensitivity, low form factor, low current detector
VD907
Safety loop, fail safe
Fixed sensitivity presence detector
VD908
Programmable functions
Set sensitivity and function on a single relay
VD909
Fail secure pulse only
Single sensitivity exit sensor for single point inductive sensors
Dinky versions
Installation
The simplicity of the dinky module starts with its minimal connections. The relay, power and loop input are electrically isolated, so there is no conflict.
There is a wide power supply range, so it functions equally from 12V battery systems to 30V ac outputs from gate control panels.
Safety circuits are likely to use the N/C (1) and Com (2) terminals. Activation applications are likely to use the Com (2) and N/O (3) terminals.
Wiring colour are a suggestion, but commonly used in automation circles, and marked on the Dinky label
Diagnostics
The red detect LED is ON when a vehicle is over the loop detection area. It only flashes briefly on VD909, but will remain on for VD906 and VD907
Green Power LED flashes once per second indicating the detector is powered and operating. The green LED is also for loop diagnostics. If the loop becomes disconnected the green LED flashes at 2 times per second. This LED will flash 10 times per second is the loop is shorted.
Most problems are loop faults. Inspect the ground around the loop for surface break up. To check for open circuit loops, un-plug the connector, then check resistance with a digital test meter. Resistance should be less than 100 ohms.
A temorary loop can be made with 15m of single core cable laid on top of the road surface. It will be sensitive to small movements but stable enough to test the detector module. If this solves the problem you may need to replace the loop.
Loop installation is a well established road technique. We have published articles on this website. There are links below.
