Entron EN1000 series, Installation And Operation Manual

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Page 89
5. Click the left SCHEDULE push-button until the SCHEDULE display shows [
X!,!
].
6. Use the DATA and ENTER push-buttons to program:
[
X!,!
] = xxxx , where
xxxx is: welding transformer ratio rA
WT
= U
P
/ U
S
= I
SECONDARY
/ I
PRIMARY
;
or any number from 0001 to max 0435, 0174, 0087, or 0043 for PT2, PT5,
PT10 or PT20, respectively.
7. Click the SELECT push-button and select CURRENT [%] or [kA].
8. Program the desired Current in [%] (monitoring mode) or in [kA] (compensation and
monitoring mode) for the dialed Schedule.
9. Put the control back in the OPERATE Mode.
Table 8.2.1 Constant Current Ratio Modes with Primary Sensor
PT designation Coil Ratio RANGE rA
WT MAX
[
.!X!
]
Compensation Monitoring
PT2 200:5 A/A 200 A 0435 12 13
PT5 500:5 A/A 500 A 0174 14 15
PT10 1000:5 A/A 1000 A 0087 16 17
PT20 2000:5 A/A 2000 A 0043 18 19
All monitoring modes [
.!X!
] = 13, 15, 17, or 19 have following exceptions:
CURRENT
- current in [%] from 0000 (0 %) to 0099 (99%);
7!U!
- Low current limit window in [kA] from 00.00 (0 kA) to 99.99 (99.99 kA);
3!O!
- High current limit window in [kA] from 00.00 (0 kA) to 99.99 (99.99 kA).
In these monitoring modes also, RMS in [kA] will be always shown on DATA display after
end of the sequence, which may be useful for setting Hi/Low limit window.
NOTE :
For [
X!,!
] = 0010, schedule parameter current will be programmed in “primary
Amps” and Control will show on display primary current in [A]. This may be useful
if welding transformer ratio is unknown.
8.2.3 SET POINT SETUP FOR PRIMARY COMPENSATION MODE
Since the setup is not required in Ratio Mode the Control will use calibrated gain to operate
and show current on the display. But, depending on the size of the welding transformer, the
size of the primary current transformer and maximum operating range of the machine, Up-
slope or overshoot during the first several cycles of the weld could happen
only in
compensation mode. This may happen because the Control does not know the correlation
between the percentage of phase shift and the measured current in kA before the weld. In
order to eliminate or minimize the effect of Up-slope or overshoot during compensation, the
following simple set point setup procedure is recommended (but not required).
1. Put the control in PROGRAM Mode.
2. Program one of the monitoring modes [
.!X!
] = 13, 15, 17, or 19.
3. Program the desired Current in [%], 0060 for 60%, for the dialed Schedule, along with
other schedule parameters like SQUEEZE, WELD or HOLD time.
4. Put the control back in the OPERATE Mode.
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