Amada 1-288-01, Operation Manual, Page: 91 / 144

CHAPTER 6: MAINTENANCE
HF28 DC RESISTANCE WELDING SYSTEM
990-372 6-3
Problem Cause (in order of probability) Problem Cause (in order of probability)
Weld Piece
Over-
heating 1. Excessive weld time set at HF28
2. Excessive current/energy set at HF28
2. Insufficient weld head force
3. Incompatible weld piece materials
3. Wrong electrode material/tip shape
4. Contaminated electrode surface
Weld Piece
Discoloration 1. Excessive weld time set at HF28
1. No cover gas on weld piece
2. Excessive current/energy set at HF28
3. Insufficient weld head force
3. Contaminated weld piece surface/ plating
4. Wrong electrode material/tip shape
4. Contaminated electrode surface
Alarm Messages
Alarm Message Description Corrective Action
ACCESS DENIED!
SYSTEM
SECURITY ON Operator tried to change a weld schedule
number, individual weld schedule
parameters, I/O switch functions, and
calibration parameters. Press MENU, select System Security, then enter
the correct access code to turn off the System or
Calibration Lock protection features.
NOTE: Entering a security code of 280 will
always unlock the system.
ACCESS DENIED!
SCHEDULE LOCK
ON Operator tried to change a weld schedule
or individual weld parameters. Press MENU, select System Security, then enter
your access code to turn off System Security.
NOTE: Entering a security code of 280 will
always unlock the system.
CALIBRATION
RESET TO
DEFAULT User entered calibration values reset to
factory default values. Execute the built-in calibration procedure to get
the correct setting.
CHECK CONTROL
SIGNALS INPUT
STATUS One or more of the I/O input control
signals is preventing the HF28 from
continuing to operate. Remove the I/O input control signal condition
preventing further HF28 operation.
NOTE: The correct removal action depends on
how the control signal select in the Setup 1 menu
was programmed by the user.
CHECK INPUT
SWITCH STATUS One or more of the Firing or Foot Switch
input signals is preventing the HF28
from continuing to operate. Remove the I/O input control signal condition
preventing further HF28 operation.
NOTE: The correct removal action depends on
how the INPUT SWITCH SELECT in the Setup
1 menu was programmed by the user.
CHECK VOLTAGE
CABLE No electrode voltage measurement was
made. Verity that the Voltage Sense Cable is properly
connected to the electrodes or electrode holder.
NOTE: Polarity is not important for the cable
connection.