Calibration and Verification Sorensen SGI Series
4-2 M550221-01 Rev U
4.2 Calibration and Verification Procedures
WARNING!
Hazardous voltages might be present on the output, even after it is disabled,
due to stored capacitive charge. Disconnect the AC mains input, and allow
5 minutes to drain the output capacitive charge to safe levels, before
connecting or removing output wiring.
All calibration potentiometers are on circuit board assemblies located at the
front of the chassis, and adjustment of the potentiometers is made from the top
of the chassis. Refer to Figure 4-1 for the physical location of the
potentiometers. Some of the models will require partial removal of the top
cover of the chassis to gain access to the potentiometers. This is dependent
on the type of chassis, and whether the Ethernet option is installed.
The 6U-chassis units and earlier 3U-chassis units have access holes in the top
cover that allow adjustment of the calibration potentiometers without removing
the top cover. However, if the Ethernet option is installed, some of the
potentiometers are covered by a ribbon-cable. To adjust those
potentiometers, the cover should be partially removed, and slid towards the
rear of the chassis just enough to expose the location of the potentiometers,
but with the cover still on top of the chassis. The ribbon-cable should then be
carefully moved sufficiently to expose the adjustment screws of the
potentiometers.
The latest 3U-chassis units do not have access holes in the top cover, and the
top cover must be partially removed to perform calibration. The cover should
be slid towards the rear of the chassis just enough to expose the
potentiometers, but with the cover still on top of the chassis. If the Ethernet
option is installed, a ribbon-cable must be moved, as described above for the
6U-chassis.
When a unit is configured with the Remote Isolated Analog Interface option,
calibration must be first performed on that option (refer to Section 4.3), before
the standard calibration and verification procedures of Section 4.2 are
performed.
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