KROHNE BM 70 M - Manual (Page 73)

BM 70 M 73
4.3 Changeover between 1 fuse (TN system) and 2 fuses (IT system) (AC-Version only)
Plug the blue wire on the "line" board into the desired position "TN" or "IT". Do not forget to
alter the information TN or IT on the signal converter nameplate ("field power").
5. Reassemble in reverse order, Points 3-1.
Important:
Ensure that the screw thread of cover DE on the electronic compartment is well
greased at all times.
Power supply unit 115/230 V AC Power supply unit 24 V DCAC
9.4 Advice on safety
Insulation rating
The insulation of type BM 70 M level gauges is rated in conformity with VDE 0110/01.89,
equivalent to IEC 664, and takes into account the following ratings:
• Overvoltage category for the power line circuit: III
• Overvoltage category for the output circuit: II
• Insulation contamination level: 2 (inside the device)
Disconnecting device, miniature fuse
Type BM 70 M level gauges do not feature any device for switching or disconnection.
Class of protection
The BM 70 M level gauge is designed for Safety Class 1 in conformity with VDE 0106 Part 1.
24 V DCAC supply
When connected to a "functional extra-low voltage with safety separation" power source (SELV or
PELV) in accordance with VDE 0100, Part 410 or equivalent (inter)national regulations,
connection of a safety conductor (PE) is not required.
L IT TN
fuse F2
fuse F3
230V
115V
voltage
selector
isolated system (IT):
grounded system (TN):
brown blue
brown blue
230V: T 160mA
115V: T 315mA
light-emitting diodes for
voltage control
24V -5V +5V Signal output
brown blue
F3 F4
Fuses
T 1.25A
-5V
+5V
24V
signal
output
light-emitting diodes for
voltage control