Reference Guide
IMACS System Release 5.1.9
1-11
System Overview
U.S. and European Chassis Configuration
1.3
U.S. and European Chassis Configuration
The chassis can be configured to comply with either U.S. (domestic) or European electrical
safety standards by setting a jumper inside each chassis. Refer to
Chapter 3. Installation
for
details.
In order to meet the safety requirements of 73/23/EEC, it was necessary to increase the
separation of the backplane traces for -12VDC and -48VDC. This was accomplished by
creating a second -12VDC trace that has sufficient separation from the -48VDC trace. Newer
cards and chassis have been designed with a jumper (CE) to allow the user to select which
trace to use. Older cards which are not equipped with the CE jumper require the chassis jumper
to be in the US position while newer cards equipped with the CE jumper will work in either
position as long as the jumper on the cards and the chassis is in the same position. If there is
a mismatch of the cards and chassis, the cards will not power up correctly.