CHAPTER 4: CONTROLS
MODEL HF2 2 kHz HIGH FREQUENCY RESISTANCE WELDING POWER SUPPLY
990-057
4-9
Control Signals - Remote Weld Schedule Selection Input
All weld schedules must be entered and saved using the HF2 Weld Control Front Panel keys. After
saving the desired weld schedules, each schedule can be recalled prior to initiating the welding process
cycle. Using the PLC (Figure 4-8), remote weld schedule selection (chain schedule feature turned off)
can be implemented by closing the binary Remote Schedule Select lines according to the following
table:
WELD
SCHED
2
0
Pin 1
2
1
Pin 2
2
2
Pin 3
2
3
Pin 4 2
4
Pin 12
2
5
Pin 5 2
6
Pin 14
0 0 0 0 0 0 0 0
1 1 0 0 0 0 0 0
2 0 1 0 0 0 0 0
Binary progression from 3 to 126
127 1 1 1 1 1 1 1
NOTE:
0 = Open; 1 = Closed
Using a remote chain control box in place of the PLC, a semi-automatic chain weld schedule can be
used to control the remote schedule select lines through the Control Signals Connector in accordance
with the following table:
Pin No.
Function
Description
1
Schedule Down
Decrement the schedule number
2
Schedule Up
Increment the schedule number
3
Reset
Set the schedule number = power up schedule number
4
Auto/Manual
Enable (Auto)/disable (Manual) the chain schedule function
Note:
If (Manual) is selected on pin 4, the chain control box will override the HF2 chain schedule on/off
function and weld schedules can be selected manually from the chain control box (see Figure 4-9).
Control Signals - Emergency Stop Input (Figure 4-8)
Connect a reed relay, or the open collector of an opto coupler to Pin 10 of the Control Signals connector
to immediately terminate the welding process. No welding process can be initiated until the switch
closure has been removed. The emitter of the opto coupler must be connected to Pin 11.
