8
Each electronic circuit switches its “own” relay (SPDT) for the corresponding output. Only when
both relays of both electronic circuits are driven (activated) equally (e.g. during normal operating
status) is the output active.
The output contacts do not have any latching. The switching behaviour is
exclusively in line with the desired specified (programmed) state. If latching is
required, this manual locking (latching) must be carried out on site.
4.4 Components of the control unit (CU)
The control unit contains:
1 LCD display (2-line each 16 characters) for communication with the operator
(programming and information display)
4 buttons for programming
3 LEDs as status indication
1 SPDT alarm output for fill level signalling (fixed); the corresponding probes (LW and/or HW)
can be freely chosen
1 SPDT error output (fixed); output is in state of rest, if any system error occurs
7 SPDT outputs freely controllable
(see assignment plan Chap.: 5.2.2)
1 4mA .. 20mA output for loads up to 500Ω, not galv. isolated
4.5 Operation
Operation of the EWLI-3B is carried out by the 4 buttons of the CU. This is described in Chap. 6
“Configuration via Menu”.
IGEMA
EWLI3 - CU
