www.garan.co.uk
Rev 2.1 subject to alteration
4-20mA Loop Fine Tune Adjustment
The current loop output is proportional to the elevator load including any attached chain (4mA when empty to 20mA when at capacity).
Although the unit provides an accurate output without the need for any adjustment, this procedure offers a quick and simple means of
measuring the output using a multi-meter connected in series with the 4-20mA Loop output terminals, and without having to monitor the
sensor. The output can also be re-tuned during the process, if required.
Connect the multi-meter as shown below:
Control
Signal
4-20mA
Loop
Do not connect the meter across the 4-20mA output.
This may result in a blown fuse in your meter.
Cal
Load
Zero
Model EWS 102
Elevator Load Weighing Device
12-24VDC
1
2
3
ww
w
.garan.co.uk
+Exc
+Sig
-Sig
-Exc
Scn
Control
Signal
4-20mA
Loop
Power Supply
Common Ground
4-20mA Output to Elevator Drive Unit
Controller/Driver Input
Operating Mode
Operating Mode
Fine Tune Procedure
T
o enter the test and fine tuning p
rocedure,
press the
button (unit beeps), hold it for
about a second and then release it (unit beeps
again).
To go straight to the Loop output test, press
4mA output. At this point, the meter should measure
4mA exactly. If necessary, press to enable
fin
e tuning
or press to move to the 20mA setting. To adjust
the 4mA output, use the and buttons to edit
the displayed 3-digit value. Once adjusted, save it by
pressing
.
The meter should now measure 20mA exactly. If
necessary, press t
o enable fine tuning or p
ress to
exit test mode. To adjust the 20mA output, use the
and buttons to edit the displayed 4-digit value. Once
adjusted, save it by pressing
.
C
M
Y
CM
MY
CY
CMY
K
5 EWS 102 4-20mA Supplementary Information Garan2.pdf 1 17/05/2016 14:32:24