KROHNE MFC 300 EN - Manual (Page 55)

ELECTRICAL CONNECTIONS
4
55
MFC 300
www.krohne.com 02/2012 - 4000498602 - MA MFC 300 R03 en
Pulse/frequency output active, modular I/Os
• U
nom
= 24 VDC
• f
max
in the operating menu set to f
max
≤ 100 Hz:
I ≤ 20 mA
open:
I ≤ 0.05 mA
closed:
U
0, nom
= 24 V at I = 20 mA
• f
max
in operating menu set to 100 Hz < f
max
≤ 10 kHz:
I ≤ 20 mA
open:
I ≤ 0.05 mA
closed:
U
0, nom
= 22.5 V at I = 1 mA
U
0, nom
= 21.5 V at I = 10 mA
U
0, nom
= 19 V at I = 20 mA
• If the following maximum load impedance R
L, max
is exceeded, the load impedance R
L
must
be reduced accordingly by parallel connection of R:
f ≤ 100 Hz: R
L, max
= 47 kΩ
f ≤ 1 kHz: R
L, max
= 10 kΩ
f ≤ 10 kHz: R
L, max
= 1 kΩ
• The minimum load impedance R
L, min
is calculated as follows:
R
L, min
= (U
ext
- U
0
) / I
max
• X designates the connection terminals A, B or D, depending on the version of the signal
converter.
INFORMATION!
•
For frequencies above 100 Hz, shielded cables are to be used in order to reduce effects from
electrical interferences (EMC).
• Compact and field housing versions: Compact and field housing versions: Compact and field housing versions: Compact and field housing versions: Shield connected via the cable terminals in the terminal
compartment.
Wall-mounted version:
Wall-mounted version: Wall-mounted version: Wall-mounted version: Shield connected using 6.3 mm / 0.25" push-on connectors
(insulation to DIN 46245) in the terminal compartment.
• Any connection polarity.
Figure 4-20: Pulse / frequency output active P
a
.book Page 55 Monday, February 6, 2012 11:01 AM