Binary Output Relays
System Contact
The
System OK alarm relay (SC)
is the devices
»
LIFE
CONTACT
«
.
Its installation location depends on the housing
type. Please refer to the wiring diagram of the device (WDC-contact).
The
System-OK relay (SC)
cannot be parameterized. The system contact is an operating current contact that
picks-up, when the device is free from internal faults. While the device is booting up, the
System OK relay (SC)
remains dropped-off. As soon as the system was duly started up, the relay picks up and the assigned LED is
activated accordingly (please refer to chapter Self Supervision).
EN MRU4 10/09
Page 101