holthausen
elektronik GmbH
Electronic Vibration monitoring Unit
ESW
®
-small-Compact
13. Analog output settings
The 0 to 20mA output can be used for displaying of several values on the analog output.
With the standard setting
(S2=OFF)
the output current corresponds to the measured signal.
For example, an analog current value of 20mA corresponds to a measured vibration velocity
that has reached 100% of the measuring range set.
Important
:
By switching
(S2=ON)
the analog output can be used for setting or reading of
the limit values G1 and G2.
The limit value adjustment means a current of 20mA, so that the switch level close to 100%
of the adjusted measurement range.
Output Variable
Switch Position
S3
Limit value G1
OFF
Limit value G2
ON
14. Adjustment of the limiting values
If the measuring signal exceeds certain limiting values, the ESW
®
-small-Compact shall react
by switching potential-free relay contacts. These limit values can be set inside the unit by
potentiometers. The limit values can be set between 10% and 100% of the selected
measuring range.
The limit value G1 will be adjusted with potentiometer P1. Exceeded the value of G1 for longer
than the rise time delay for G1, then K1 is switched. The limit value G2 will be adjusted with
potentiometer P2. If limit of G2 will be longer than the rise time delay for G2 exceeded, then
K2 is switched.
Rest the measured value just from time to time over the limit value, so counts the activation
delay time after each overstepping of the limit value once more. A short overstepping of the
limit values is shown by flashing of the yellow LED for G1 and the red LED for G2.
If threshold value 1 is set in the SET mode, the green LED lights up and the yellow LED
flashes. If the threshold value 2 is set, the green LED lights up and the red LED flashes.
Should e.g. G1 be set to 15mm/s = 30% in the measuring range 50mm/s, then with S3=OFF
is set to threshold value G1. Then an output current of 6 mA (= 30% of 20 mA) is set using
potentiometer P1.
At the analog output, the threshold values are always output with reference to 0-20 mA
even if the output current range is set to 4-20 mA.
That means, an output current of 2mA
(potentiometer at the left stop) means 10% of the measuring range as alarm threshold and
20 mA (potentiometer at the right stop) corresponds to 100% of the measuring range as
alarm threshold.
For setting the threshold value G2, S3 is set to ON and the same procedure is repeated.
After setting the threshold values care should be taken to bring S2 back to “OFF”
position
in order to start the normal operation again.
If the potentiometers are adjusted without bringing S2 into ON position, the device gives an
error message. (Protection against unintentional adjustment and defective potentiometers.)
11
LED1 LED2
LED3
P1
P2
J1,J2
On
1 2 3 4 5 6
S
