Specifications

MedWeld 3000 Catalog Revision 8
July 2002 Page 37 of 72
Cascade Weld Control Solutions
The MedWeld 3005 Cascade system is available in kit, remote enclosures or fully
integrated formats.
In the remote enclosure format, a NEMA 12 enclosure is equipped with multiple 1200
amp SCRs, the cascade cards, one firing module, one current monitoring sensor, and
the optional circuit breaker and isolation contactor. One MedWeld 3005 resistance-
welding processor module is shipped with the enclosure to be installed in the main
processor rack. There are four different remote enclosure models; MedWeld 3005 (2-
SCRs), MedWeld 3045 (3-SCRs), MedWeld 3055 (6-SCRs) and MedWeld 3095 (12-SCRs
with bus bars or 15 SCRs in a vertical stack-up).
In the fully integrated scheme, a NEMA 12 enclosure is equipped with all the material
of the remote enclosure system described above. It also accommodates the Allen-
Bradley
TM
SLC 500 hardware for full machine and welding control requirements.
A function in the MedWeld 3005 resistance-welding processor “TURN ON CONTACTOR
SELECT #nn” is used for selecting the proper SCR to fire. The value “nn” is
programmable from 01 to 15. The output for the contactor select can either be
24VAC, 24VDC or 120VAC. The cascade card automatically detects the voltage of the
output point.
Each cascade card can interface with 3 SCRs. Up to 5 cascade cards can be daisy-
chained together for the selection of up to 15 SCRs. There is on-board hardware
protection that ensures that only 1 SCR is selected even if more than one output is
turned on. There are diagnostic LEDs to visually signify which SCR is addressed.