SIGMATEK ETV 1591-H, Manual, Page: 45 / 62

CONTROL PANEL ETV 1591-H
24.03.2015 Page 43
6.5 Wiring Guidelines for the Digital Inputs
The input filters, which suppress noise signals, allow operation in harsh environmental
conditions. A careful wiring method is also recommended to ensure error-free function.
The following guidelines should be observed:

Avoid parallel connections between input lines and load-bearing circuits.

Protective circuits for all relays (RC networks or free-wheeling diodes)

Correct wiring to ground

The GND connection for the inputs and current supply module must be connected to a
common earth bus over the shortest route possible.

The earth bus should be connected to the switch box when possible!

Connecting the Signal Sensor