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Figure 0-10. Ground Wire Connection
This operation must be performed before any network connection.
Note: All the previous measurements should indicate 0.1 ohm or less.
eBuilding Grounding
Check that there is less than 1 V ac between the metal housings of plugs, connec-
tors, receptacles, and so on., and any grounded point in the building. This can be
any grounded metal structure, such as the stanchions of a raised floor (if they are
electrically connected to building ground), a metal water pipe, building steel, and so
on.
Notes:
1) When probing a painted metal part, ensure that the meter probe tip penetrates the
paint.
2) Also check plugs of incoming cables.
5 Circuit Breaker and Protector Rating
Refer to Table 0-4 on page xxx for CB and CP locations.
Check that:
All CBs and CPs in the 3745 and 3746-900 are rated at the indicated value in Table 0-4 on
page xxx. If the rating is not indicated, check the part number against one of the following:
–
IBM 3745 Communication Controller Models 130 to 17A, Parts Catalog
, S135-2012
–
IBM 3746 Expansion Unit Model 900, Parts Catalog
, S135-2013
–
IBM 3746 Nways Multiprotocol Controller Models 900 and 950, Parts Catalog
, S135-2015.
The fuses in the controller expansion ac outlet distribution box must be 7 A, 250 V slow
(PN 58G5782).
6 Input Power Voltage
The power rating plate indicates the voltage range available (200/220/240) and the frequency
(50/60 Hz).
3745 Input Power voltage
The voltage label (label J) indicates the input voltage for which the 3745 is wired. This information
must be in accordance with Switch 1 on PS2.
Performing a power conversion Inspection.
A power conversion inspection must be performed on any 3745 Communication Controller that
has been converted from 50 Hz to 60 Hz, or from 60 Hz to 50 Hz.
The following is used only for the primary power box. Refer to Figure 4-1 on page 4-3 for
location.
Check Table 0-1 on page xxviii for the correct part numbers for the specified 50 Hz or 60 Hz
use. In case of discrepancy, contact your support structure.
Safety xxvii