Amada HF-2500A, Operation Manual, Page: 63 / 164

CHAPTER 4: INTRODUCTION TO FEEDBACK MODES AND MONITORING
HF-2500A HIGH FREQUENCY WELD CONTROL
990-371 4-7
4. Weld To A Limit
Applications
•
Parts with narrow weld window
•
Part-to-part positioning problems
•
Electrode-to-part positioning problems
Function
To stop the weld when a sufficient current , voltage , or power level is reached. Using limits in this way
ensures a more consistent input of energy, which produces consistently good welds.
Description
This function terminates the weld energy during the welding process if pre-set weld current , voltage , or
power limits are exceeded. In addition to inhibiting the weld, the Power Supply has four programmable
relay outputs which can be used to trigger alarms to signal operators of weld faults, or signal automation
equipment to perform pre-programmed actions, such as stopping the production line so the faulty weld
piece can be removed.
The monitor measures the weld energy parameters during the weld period and compares the measurements
against the programmed limits. If any of the programmed limits are exceeded, the energy limits monitor
sets the Power Supply to a state selected from the
OUT OF LIMITS ACTION
menu. In addition, the Power
Supplies relays can be programmed to trigger alarms, or trigger an action in an automated welding system.
In the profile above, the weld current limit is at a sufficient level to get a good weld. In this case, the
operator has selected the option to terminate the weld energy under this condition, so the energy limits
monitor terminates the Pulse 1 weld and inhibits the Pulse 2 weld if it had been programmed.
NOTE: When using the energy limits monitor, always select a monitor mode that is different from the
feedback mode. For example:
•
If you are welding in constant current, monitor voltage.
•
If you are welding in constant voltage, monitor current.
•
If you are welding in constant power, monitor current or voltage.