ETH-messtehnik GMV2-K, Operating Instructions Manual

Page: 27 / 39

ETH-messtechnik gmbh D-74415 Gschwend P.O. 16
Nr.: 162e Operating Instructions GMV2-K revised: 09.05.2019 Rev.: 0
Subject to change without prior notice
27
10 Screwing Technology
10.1 Time-Based Sequence Diagram
10.2 Timing
•
tA: The suppression phase is started once when the torque exceeds 5% of the transducer full scale value. The torque
values are suppressed during this period. This period should not be too long, because when no starting peak occurs,
the time period begins shortly before the screw head is mounted. Angle counting could thus be delayed. Shut off is
also suppressed. The value "0" for t
A
de-activates the function.
•
tn: The after time is started once when the shut off has been activated. When this time has elapsed, angle counter and
torque peak measurement are disabled. The after time must be set to suit the screwing sequence dynamics, so that the
power-operated screwdriver run-on is recorded.
We recommend that th
e
default setting “
0
”
i
s selected. Otherwise select a long time period
!
Note:
Without shut off the measurement is not limited by t
N
and runs on until the peak value is erased.
The maximum value for angle and torque is always displayed and saved for a long after time.
•
The
erasure time
is always restarted with increasing torque. It defines how long the value should remain on the
screen after the final peak. The measurement is then saved, peak values are reset and a new measurement is started.
•
The
storing time
is negligible for an OK screwing. However if measured values are outside the setpoint values
(NOK), storing must be confirmed – thus delaying the procedure.
IO-screwing with shut off based on torque and display of angle
Torque /
Angle
Torque limit max
Torque limit min
Peak value of
torque
Shut off
torque
Peak value
of angle
Trigger value
for angle
5% of
full scale value
time
t
A
t
N
start
of torque
measurement
t
s:
suppression time
t
a:
After time
shut off
start
of angle
measurement
end of measurement
measurement stopped
new
measurement
erasure time
Time for storing
* * time for storing measurements
without confirmation : < 0,1 second