Power Supply, Relay Switching Voltage - Conrad Electronic 197720 Notice D'emploi

b) Power supply, relay switching voltage
• Order no.: 197720
Only use the relay board in low-voltage circuits (max. 24V).
Higher voltage rates (e.g. main voltage 230V~) are not permissible. There is
danger to life through an electric shock and a risk of fire!
The maximum admissible switching current is 7A per relay. The admissible
supply voltage is min. 12V/DC, max. 24V/DC. Exceeding the admissible
values leads to the destruction of the relay board and bears the risk of fire or
electric shock.
• Order no.: 197730
This version of the relay board features relays that allow the switching of mains
voltage (max. 230V/AC, 16A) or direct current (max. 24V/DC). Exceeding the
admissible values leads to the destruction of the relay board and bears the risk
of fire or electric shock.
Please note that work on the mains voltage may only be carried out by an
expert.
Improper handling of the mains voltage not only endangers yourself but also
others. There is the risk of a life-threatening electric shock!

The RS232 or USB cable leading to the PC may not be longer than 3 m. The
same applies for the RS232 cables (RX/TX/GND) between the boards (if more
than one board is used).
Interferences like EMV impulses, electrostatic discharges (ESD), surge impulses
or cable-conducted jamming resistance may lead to a drop in relay performance.
The controller of the relay board itself is not capable of restoring the switching
condition of the relays. The relay board can be addressed again after at most
1 second. However, the initialization as well as the original switching status of
the relays are lost. In this case, you have to check in the control software that
the switching status of the relays is monitored permanently and that the
initialization as well as the original switching condition of the relays is ensured.
For this purpose, activate the watchdog function in the supplied software
(green check mark in the menu item "Watchdog").
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