KROHNE MFC 400 EN - Manual (Page 33)

ELECTRICAL CONNECTIONS
4
33
MFC 400
www.krohne.com 08/2013 - 4002075802 - MA MFC 400 R02 en
4.8.2 Pulse and frequency output
• All outputs are electrically isolated from each other and from all other circuits.
• All operating data and functions can be adjusted.
• Passive mode:
External power supply required: U
ext
≤ 32 VDC
I ≤ 20 mA at f ≤ 10 kHz (over range up to f
max
≤ 12 kHz)
I ≤ 100 mA at f ≤ 100 Hz
• Active mode:
Use of the internal power supply: U
nom
= 24 VDC
I ≤ 20 mA at f ≤ 10 kHz (over range up to f
max
≤ 12 kHz)
I ≤ 20 mA at f ≤ 100 Hz
• NAMUR mode: passive in accordance with EN 60947-5-6, f ≤ 10 kHz,
over range up to f
max
≤ 12 kHz
• Scaling:
Frequency output: in pulses per time unit (e.g. 1000 pulses/s at Q
100%
);
Pulse output: quantity per pulse.
• Pulse width:
symmetric (pulse duty factor 1:1, independent of output frequency)
automatic (with fixed pulse width, duty factor approx. 1:1 at Q
100%
) or
fixed (pulse width adjustable as required from 0.05 ms...2 s)
• Forward / reverse flow measurement (F/R mode) is possible.
• All pulse and frequency outputs can also be used as a status output / limit switch.
INFORMATION!
Depending on the version, the pulse and frequency outputs must be connected passively or
actively or according to NAMUR EN 60947-5-6! Which I/O version and inputs/outputs are
installed in your signal converter are indicated on the sticker in the cover of the terminal
compartment.
INFORMATION!
For further information refer to Description of the inputs and outputs on page 38 and refer to
Technical data on page 122.
DANGER!
For devices used in hazardous areas, additional safety notes apply; please refer to the Ex
documentation.
.book Page 33 Monday, August 26, 2013 9:05 AM