VEK MNH Operating Manual v1.3 en
Switch-off threshold indicator
In the Detector Tool , the switch-off threshold is displayed as a multiplication of the hysteresis (%) with the
switch-on threshold (absolute value). The absolute value of the switch-off threshold thus changes
analogously to the hysteresis.
Examples
In the case of a switch-on threshold of 160 and varying hystereses, the switch-off threshold is calculated as
follows:
Hysteresis 75% cut-out threshold value: 0.75 160 120
Hysteresis 20 % cut-out threshold value: 0.20 160 32
11.3 Setting loop frequency (frequency step)
The operating frequency setting serves to prevent couplings.
Interference between loops
Couplings may occur between adjacent loops or loop connections from other detectors. Therefore, loops
less than 2 metres apart should not operate at the same loop frequency. In this case a frequency spacing of
at least 5 kHz must be maintained.
Loop frequency indicator
The operating frequency of the loops after switching on or changes is reflected with an LED flash sequence
and can be read off in the Detector Tool.
Multiplexing
No coupling between the loops of a detector takes place through multiplexing (2 channel version). The loops
on a detector may therefore operate on the same frequency.
Deactivating free loop channels
Loop channels with no permanently connected induction loops should be switched off in the Detector
Tool. If this is not done, a cyclical request is made asking whether an available induction loop has yet
been connected. Under unfavourable circumstances this can sporadically lead to interference on the
intact loop channels.
Loop inductivity range
In the event of loop inductivity outside the recommended range, the available frequency range may be
restricted.
none (loop channel switched off)
Tab. 20: Loop frequency settings
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