BERTHOLD TECHNOLOGIES LB4710-050, User Manual

Page: 73 / 227

Chapter 8 Electrical Installation
Mini-Switch LB 471
73
8.1.1 Pin Assignment of Terminal Block
The terminal block of the limit switch includes the following con-
nections:
No. Designation
2a / 2c Detector connection depending on the version:
- “intrinsically safe”
- “not intrinsically safe”
12a / 12b
/ 10c Relay 2: Alarm relay with
change-over contacts SPDT
(shutter 12a/c: open in
case of alarm and in the idle
state
break contact: 10c/12c)
alternatively configurable as
max/min AC: max. 250V,
max. 1A, max 200VA
DC: max. 300V,
max. 1A, max. 60W
at resistive load
14a / 14c Relay 3: warning relay
(shutter: open in case of
alarm and in the idle state)
16a / 16c Relay 1: collective failure
message
(shutter: open in case of
alarm and in the idle state)
20a / 20c Digital input 2
Reserve
Enable the digital
inputs by short-
circuiting the
terminals.
22a / 22c Digital input 3
for empty calibration
If this input is enabled, an
empty calibration is carried
out automatically followed
by a calibration.
30a / 30c Supply: 18 – 30 V DC or 24V AC
Power consumption: approx. 4 VA(AC), 4 W(DC)
32a / 32c Grounding terminals
Only in the 7-TE cassette, these contacts are led through directly.
In case of the 19" rack and the wall housing, the respectively lead
through terminals are used. See connection diagrams in the Ap-
pendix on page 137.