Tweco Weld Sequencer - Manual (Page 23)

Manual 0-2023 17 INSTALLATION PROCEDURES
3.07 CS1 Current Slope
1. Install CS1 into the bottom of either the Weld Sequencer
Enclosure or the Enclosure Expansion (see NOTE) and
secure with screws provided.
NOTE
If CP1 and/or CS1 are used without GS1 they are
mounted in the Weld Sequencer Enclosure. When
either or both are used with the Gas Slope the En-
closure Expansion must be mounted to the top of
the Weld Sequencer Enclosure (refer to Figure 3-6).
CP1 and CS1 are then mounted in the Enclosure
Expansion.
2. Connect CS1 to the Weld Sequencer Enclosure wiring
harness with the J8 connectors.
3.08 CP1 Pulser
1. Install CP1 into Weld Sequencer Enclosure or Enclo-
sure Expansion above CS1 (if included) and secure
with screws provided.
2. Connect CP1 to the Weld Sequencer Enclosure wiring
harness with the J7 connectors.
3.09 Automatic Voltage Control
(AVC) Lockout
When using CP1 on systems having Automatic Voltage
Control (AVC) it is necessary to inhibit AVC when CP1 is
not at peak voltage so that the AVC does not try to track
the voltage change due to pulsing. Since it is possible
that the power supply ground of the AVC unit will not be
common to that of the Weld Sequencer the circuit to sup-
ply the 'inhibit' signal is electrically isolated from CP1 by
an optoisolator.
The ground and supply voltage for the isolation circuit
must be supplied from the AVC (refer to Appendix III).
Supply voltage can be from +5 to +15 vdc. The AVC 'in-
hibit' signal is low, or not inhibited, when the CP1 is at
peak voltage, and high, or inhibited (equal to supply volt-
age), during the rest of the cycle.
3.10 Auxiliary Connections For
Interfacing External Controls
There are three terminal strips provided on the base of
the Weld Sequencer Enclosure for interfacing the Se-
quencer with other components or controls(refer to Ap-
pendix I and III for available locations and signals). Re-
lay AL de-energizes at the end of upslope and re-energizes
at the start of downslope. The CC relay signals contactor
closure and de-energizes during welding sequence.
NOTE
When spot welding using automated control de-
vices (and only if RP1 Remote Pendant is used)
the jumper across TB3-2 to TB3-3 must be removed
(refer to Appendix III).