Evaluation unit – Type KAG2

Evaluation unit non-contact overhead wire contact


The evaluation device Type-KAG2 is used for the signal evaluation of the contact less overhead line contact
Type 8474 (TLC4).
Both an isolation- and a signal evaluation stage are housed in a modular plastic housing.

The evaluation stage evaluates the incoming signals. Depending on their number, the input signals are stored, evaluated and serially output as standard pulses.
At the top of the housing, there are eight DIP switches on the side.
A change in the standard pulse duration can be realized by the switch S1 according to the operating requirements
(S1 »off« = 0.6s, S1 »on« = 1s).

The user can change the input splitter by actuating the switch S2:
S2 »off« (1: 1) → 1 input- = 1 output pulse;
S2 »on« (2: 1) → 2 input- = 1 output pulse (1 current collector with 2 coals).

In addition to signal processing, the signals are monitored for faults. The signals or switching states which are received on the 2 signal lines are permanently compared with one another. Only antivalent signals are permitted as useful signals in a very narrow time window. If antivalent signals outside the time window or common-mode signals are detected, these are interpreted as a fault. In the event of a fault, the transmission of an output signal is blocked and the fault on the device is indicated by means of the red LED in the front. A potential-free change-over contact is available for further indication of the fault. The relay for the signaling of the fault can be operated in the quiescent or working current principle.

The DIP switch S3 in »off« position means that the relay is operated in the »quiescent current principle«, that is, it is controlled in the normal case. In the event of a fault, the yellow light-emitting diode goes out and the red light-emitting diode flashes.

In this operating mode, monitoring of the connection lines to the overhead line contact and the function of the latter also allows monitoring of the operating voltage.

In position S3 »on«, the relay operates according to the »working current principle«, that is, if a fault is present, the relay is activated and the red light-emitting diode flashes. The fault indication remains active until the fault is cleared and the fault is acknowledged at the evaluation unit or via a remote contact (terminal 19/20).

The switch S4 acts on the relay output Switch 2 in such a way that the relay is switched between quiescent and working current mode (S4 »off«, S4 »on«).
The switch S5 can be a filter
In the input (S5 »on«).

Thereby spurious pulses, the
Occur within 4 ms after a regular pulse.
The switches S6/S7/S8 are intended for other functions, which have no meaning in this version.

The evaluation unit KAG2 is only designed for a auxiliary DC-voltage. This can be fed via the connector terminals 17 (+) and 18 (GND), or via the contacts 1 (+) and 2 (GND) into the DIN rail connectors.


Only DC 24V can be supplied via the contacts in the DIN rail!

If an AC supply is to be built up, this can be done via a power supply AC/DC 24V (for example, KAG-NT), which can be supplied via the DIN rail adapter.

All connections on the housing are designed as 4-pin connectors.

Do you have any questions?
We will be happy to answer you!