Amada UB25 - Page 100

APPENDIX A: TECHNICAL SPECIFICATIONS
UB25 LINEAR DC RESISTANCE WELDING CONTROL
A-2 990-665
DESCRIPTION VALUE NOTES
Steady State Regulation
During Line Fluctuations
Output: +/- 2% of reading
Line voltage within + 15% / -10%
tolerance.
Regulation During Load
Resistance Fluctuation
Current:
Voltage:
Power:
± 2% of setting ± 2 A
± 2% of setting ± 0.05 V
± 5% of setting ± 20 W
Load variation from 0.5 to 10 milliohms,
exclusive of ripple. After weld time of 2
ms.
Steady State Control
Accuracy
Current:
Voltage:
Power:
± 2% of setting ± 2 A
± 2% of setting ± 0.05 V
± 5% of setting ± 20 W
After weld time of 2ms.
Initial Control Accuracy
(Maximum transients)
Current:
Voltage:
Power:
± 5% of setting ± 2 A
± 5% of setting ± 0.05 V
± 10% of setting ± 20 W
During first 2 ms with load resistance
greater than 2 milliohms.
Current, Voltage, Power
Repeatability:
All modes: ± 2%
Weld to weld repeatability with fixed
load resistance and input line voltage,
steady state.
Rise Time:
Limited by external secondary circuit
Data Communications
Remote capability to upload / download
weld schedule; monitor welds; set up
parameters; select schedule; and read
weld results buffer
Weld Monitor:
Range:
Current from 0 to 1.2 kiloamps
Voltage from 0 to 6.5 volts
Power from 0 to 8.0 kilowatts
User selectable limits on peak values of
one of three parameters: current, voltage,
or power. When a parameter goes outside
of limits, the unit can be set to report the
error, terminate the weld, or inhibit a
second pulse. APC functionality also
included.
Current Monitoring
Accuracy
The sum of ± 2% of setting and ± 2 A
Reference is actual current delivered.
Average value after settling time.
Voltage Monitoring Accuracy
The sum of ± 2% of setting and ± 0.05 V
at values greater than 0.1 V
Reference is actual voltage delivered.
Average value after settling time.
Voltage monitoring is not guaranteed
below 0.1 V.
Power Monitoring Accuracy
The sum of ± 5% of setting and ± 20 W
Reference is actual power delivered
Average value after settling time.