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Electrical connection
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7-32
Procedure for <Pressure calibration>
CAUTION!
Make sure that all individuals stay clear of the immediate operating range of the
weld gun.
Only input calibration values which generate pressure values the electrode gun
can support mechanicallybecause otherwise there is a risk of personal injury
and/or damage to the machine.
If you do not know the behavior of the electrode gun, use low values in the
beginning of calibration and increase these values step by step in individual
calibration operations until the required working pressure is reached.
Prerequisite:
-
The load-sensing device must be connected to the assigned terminals (see
terminal connection diagram).
Sequence:
-
The electrode to be selected must be entered in the I/O field
-
The <Pressure calibration> input signal must be set.
Now, the timer is in <Pressure calibration> mode. No start commands or program
selections entered in the entry field are accepted.
-
The timer waits until the start signal level equals 0 (essential for error han-
dling).
-
The lower command pressure value is output. Subsequently, the <Oper-
ate> signal becomes high and the timer waits for the <Start> signal.
-
The robot sets the <Start> input signal and simultaneously closes the weld
gun.
-
The timer waits for two seconds. Then the load is measured and the value
obtained is saved. The <Operate> signal is reset.
-
The <WC> signal becomes high.
-
The robot resets the <Start> signal.
-
The upper command pressure value is output and the <Operate> signal be-
comes high. Again, the timer waits for the <Start> signal.
-
The robot sets the <Start> input signal and simultaneously closes the weld
gun.
-
The timer waits for two seconds. Then the load is measured and saved. The
<Operate> signal is reset.
-
Upon correct completion of the pressure calibration process, the <Pres-
sure calibration/check finished> signal becomes high and is held until the
<Pressure calibration> input signal is reset. In this case, also the <Start>
signal must be reset.
NOTE
Please make sure that the electrode pressure is stable during measurement.
PSI 6XXX.350 L1
1070 080 067-101 (2001.03) GB
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