EN
Operating instructions float switch, model ELS
001792.04 11/2018 EN/DE
13
WARNING!
Electrical connection errors of the float switches can destroy
the reed contacts. This can lead to a malfunction in the plant
and thus lead to injury to personnel or damage to equipment.
▶
No direct operation in circuits with inductive loads.
▶
No direct operation in circuits with capacitive loads, e.g.
PLC, PCS or cable lengths > 50 m.
▶
Do not exceed the permissible switching power, see
chapter 9 “Specifications”.
Connection with inductive load
With inductive loads, the float switches should be protected by
connection to an RC element or a free-wheeling diode.
RC elements for reed contacts 10 ... 40 VA
Voltage
Resistance
Capacitance
Type of RC element
AC 24 V
100 Ω
0.33 μF
A 3/24
AC 48 V
220 Ω
0.33 μF
A 3/48
AC 115 V
470 Ω
0.33 μF
A 3/115
AC 230 V
1,500 Ω
0.33 μF
A 3/230
For RC
element
see table
S1
AC 24 ... 230 V
R
C
S1
DC 24 ... 250 V
+
–
AC voltage
DC voltage
Free-
wheeling
diode, e.g.
1N4007
5. Commissioning, operation
