Power Supply; Fig. 22: Power Supply, Sensor With Fuse And Timing Relay For 30 Minutes Of After-Run Power - IRIS IRMA MATRIX 2 Installation Manual

34/74 IRMA MATRIX R2 CAN Installation manual
released
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Power supply

The nominal voltage of the sensors is 24 V. If a gateway is installed, it must also supplied
with 24 V DC. The supply of 12 V DC is not permissible; a step-up transformer is required.
Direct connection to permanent plus is not permitted by VDV 457.
The connection to the power supply must be protected by a fuse or an automatic circuit
breaker (5 A, quick-acting - for up to 8 sensors and IRMA gateway).
Counting must be ensured even with the vehicle engine switched off (e. g. at the terminal
stop). For this purpose it is necessary to have the power supply of the sensors after-running
for approx. 30 minutes.
If no 30-minute power after-running can be provided in the vehicle, a timing relay which
can be set to at least 30 minutes (dropout/OFF delay) must be used for the after-run of the
power supply. The switch-off delay of the timer relay is activated at the moment the
ignition voltage is no longer applied.
A timer relay with e1 approval is available as optional accessory.
This sketch shows a possible switching variant in the motor vehicle sector- Fig. 22.
Fig. 22: Power supply, sensor with fuse and timing relay for 30 minutes of after-run power
1 Fuse 5 A, quick-acting
2 Timing relais,
(dropout/OFF delay) for
30 min minimum
Rev. 1.6 2018-09
3 Igniting voltage
4 Power supply of the sensors
see section 6.1, 'p. 35
5 M12 H coupler, CAN type,
M12CAN-CON-03
6 Connector for MATRIX sensors
on the CAN BUS
sCON-S-CAN-20-Kn-1m
7 DIST500-F, IRMA MATRIX
sensor, flush mount version