VEK MNH1-R24-A QUICK START GUIDE 1.4 EN
1) Restrictions with loop inductivity
If loop inductivities are outside the recommended range, it may be
possible that only one frequency stage is available. With very low
loop inductances, the maximum loop resistances are lower.
2) Relay contact current load
The rigid gold plating on the relay contacts will be destroyed if the
switching current exceeds 100 mA. Relays with contacts that are
prestressed in this manner can only reliably switch currents over
100 mA!
2 Product description
Induction loop detectors such as traffic detectors are electronic sensors
for inductive detection of metallic objects. Using induction loops, for
example, vehicles are detected, and depending on the device, their
design and direction of movement.
The traffic detectors are operated in combination with various induction
loops and electronic controller, such as frequency converters or PLC
controller.
The areas of application are, for example, the detection, monitoring and
counting of vehicles in the areas of traffic engineering, door and barrier
controller, parking and tunnel monitoring as well as traffic light systems.
The traffic detectors have the following characteristics:
• 1 loop channel
• 2 potential-free relay outputs
• 8-pole DIP switch for configuration
• 2 LEDs for indication of detector and loop states
• USB interface for diagnostics and expanded configuration
• Reset button for restoring the settings
• Connection for power supply (AC/DC)
• Galvanic isolation between loops and electronics
• Automatic alignment of the system after switch-on
• Continuous adjustment of frequency drifts to suppress
environmental influences
• Sensitivity independent of loop inductivity
• Fixed hold times independent of the loop coverage
• Compact plastic housing for mounting on DIN rail in control cabinet
The traffic detectors offer the following setting options:
• Switching between two frequency levels
• Output as presence or pulse signal or of loop faults (with Detector
Tool)
• Response threshold adjustable in 255 steps with Detector Tool, in 4
steps with DIP switch
• Hold time adjustable from 1 to 255 minutes and infinite with Detector
Tool, 5 minutes or infinite with DIP switch
• Counter for loop occupation and travel direction with Detector Tool
• Minimum signal duration for output signal with Detector Tool
• Switch-in and switch-off delay adjustable with Detector Tool
• Hysteresis (drop in threshold value) adjustable from 20 - 80% on
each channel with Detector Tool
• Detector channels can be switched off with Detector Tool
• Comprehensive diagnostic function with Detector Tool
3 Description of connections
3.1 Power supply
The detector can be operated with direct or alternating current , according
to the requirements for Safety Extra-Low Voltages (SELV) of Protection
Class III.
Note the permitted power supply
Comply with the technical data and safety instructions!
The power supply is connected to the blue terminal block.
Fig. 2: Power supply connection (blue)
3.2 Loop inputs
Up to two analogue inputs for the induction loops on the terminal block
are located on the underside of the traffic detector. The terminal block is
either 2-pole or 4-pole, depending on the product variant.
The induction loops are connected to the orange terminal blocks as
shown in the illustration.
Induction loop channel 1 connections
Fig. 3: Loop connections (orange)
3.3 Signal outputs
Each signal output can be inverted. In this case, when the power supply is
turned on, normally open contacts function as normally closed contacts,
and vice versa. This happens by switching between open circuit and
closed circuit principle.
Loop faults can also be interpreted as loop covered or as loop free.
Normally closed contact
(NC)
Normally open contact
(NO)
Not inverted
(open circuit)
Inverted
(closed
circuit)
Not inverted
(open circuit)
Inverted
(closed
circuit)
Detector
ready,
loop free
(loop covered by default, configurable as loop free with
Detector Tool)
Tab. 4: Switching states of the signal outputs
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