Dynatest FWD - 17.10 Checking the four Proximity Switch Sensors

2017.06.19 FwdMan2.8.17.docx 17-147
If the cleaning/lubricating did not result in proper catch operation, then check and adjust, if
necessary, the hyd. excess pressure (refer to instructions in a previous section).
If the catch will still not work, then it may be defective and should be repaired or replaced. In
that case, contact Dynatest for further advice and instructions.
17.9 Checking the LOWER CATCH mode
Lower the plate, raise and drop the weight. Now press the LC button and check that the catch
lowers as it should. If it did, BUT in addition the plate was raised too, then this could be due
to a leaking or falsely powered D valve. Therefore check that the D solenoid is NOT powered
when pressing LC button, otherwise check the wiring
IF LC caused (false) plate raising AND the D solenoid WAS NOT powered, then clean or
exchange D valve.
If the catch does not catch the weight when lowered, then raise the catch (LP/RW button) a
few cm (1” or so), press DROP (LP/RW and red button) to “open” the catch, and then again
lower the catch. If the catch will still not catch, then check (and adjust, if necessary) the
excess pressure (refer to separate instructions in section 3).
If catch will not catch, even if the excess pressure is OK, then the catch may need cleaning
and/or lubrication, OR it may be defective and should be replaced or repaired (see also 16.8
above).
17.10 Checking the four Proximity Switch Sensors
Four proximity switch sensors are placed as indicated in a figure on the following page.
Please also refer to their descriptions in 11.4.3, “Trailer Status Switches“.
To test that all of the proximity switch sensors are operational, lower the plate and raise the
weight to a height around mid-stroke, so that the WH proximity switch is NOT activated. DO
NOT DROP the weight!
Now all 4 sensors are accessible. Activate them one by one using a magnetic material (iron or
steel), e.g. a file or a long steel ruler.
SAFETY NOTE!
When activating the sensors, AVOID to put hands below the weight (e.g. when
activating the TG sensor)!
Place the activator in direct contact with and covering the target area.
Check that the corresponding LED on the Compact 15 front panel (next to the connection
socket of the proximity switch in question) turns ON.
Check that any proximity switch remains activated (LED on), until the activator is removed
more than approx. 5 mm (3/16”) from the sensitive surface. If not, the sensor should be
exchanged.