KROHNE MAC 100 EN - Manual (Page 26)

4
ELECTRICAL CONNECTIONS
26
OPTISENS MAC 100
www.krohne.com 04/2011 - MA OPTISENS MAC 100 R01 en
4.8.3 Control input (passive)
The passive control input can trigger different events in the converter from outside. It is engaged
via applying a voltage of U
on
> 8 VDC and disengaged via applying a voltage of U
off
< 2.5 VDC. The
properties in detail are the following:
• Passive, not polarity sensitive
• Condition "off": U
off
≤ 2.5 VDC with I
nom
= 0.4 mA
• Condition "on": U
on
≥ 8 VDC with I
nom
= 2.8 mA
• U
ext, max
≤ 32 VDC
• I
nom
= 6.5 mA with U
ext
= 24 VDC
• I
nom
= 8.2 mA with U
ext
= 32 VDC
For instance the control input can work together with a flow monitor that monitors the sample
flow and gives a signal if the flow drops below a certain threshold. If in this case the control input
has the setting "flow control", it triggers an "out of specification error" (this errors indicates that
the measured value cannot be trusted anymore). For more information refer to
Error category
"Out of specification" (S) on page 69.
There are other purposes for the usage of the control input. For detailed information refer to the
function C3.5 and especially C3.5.1 in the corresponding function table.
CAUTION!
Pay attention to the maximum voltage and current values which can be applied to the control
input! Applying power outside the allowed range can destroy or damage the device!
INFORMATION!
The factory default is a disabled control input!
.book Page 26 Friday, April 1, 2011 4:59 PM