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SATURN IIE EPABX
Installation Test Procedures
3 . 0 1
General. The SATURN HE System must be connected
t o a n e a r t h g r o u n d ( i . e . , m e t a l l i c c o l d w a t e r p i p e o r m a s t e r g r o u n d
A G-gauge
(twisted copper wire) conductor should be connect-
e d b e t w e e n t h e g r o u n d i n g l u g E 5 l o c a t e d o n t h e b o t t o m o f t h e
cabinet frame and the snlccted earth ground (refer to Section
3.00 in the SATURN HE EPABX Installation Procedures prac-
tice for details). The following tests must be performed to en-
sure that proper earth ground connections have been
accomplished, and that ground connections within the cabinet
a s s e m b l y h a v e n o t b e e n d a m a g e d o r l o o s e n e d d u r i n g s h i p m e n t .
Hazardous voltsgos txkt within the equipment csbinef. Ee
PROCEDURE
If connected, remove ac power cord
from commercial power outlet.
2
Short digital multimeter
together and noie resistance of test
leads.
3
Set
digital
multimeter
resistance range and connect its
leads between the U-ground pin of
the ac power cord and the U-ground
socket
in
the
commercial
o u t l e t ( r e f e r t o F i g u r e 3 . 0 0 f o r d e t a i l s ) .
4
Repeat procedure with second ac
power cord if optional expansion
cabinet is incorporated into system.
STEP
PROCEDURE
1
If connected, remove ac power cord
from commercial power outlet.
2
Set
digital
multimeter
resistance range and connect its
leads between ground lug E5 located
at the bottom of the cabinet frame,
and one of the busbar/backplane
attaching screws for each existing
LTU shelf (refer to Figure 3.01)
procedures with the equipment panel(s) removed.
3 . 0 2
procedures indicated in Table 3.00, check that the earth
ground connections are secure and ground conductors are
firmly positioned on grounding lug E5 at ihe bottom of the
cabinet frame.
3 . 0 3
bly within the cabinet assembly is grounded via two vertical
ed in Table 3.01, check that each shelf backplane is iniercon-
position.
Table 3.00 System Ground Test
leads
Resistance
measured
to
lowest
the measured test lead resistance.
power
Same as step 3 above.
Table 3.01 Shelf Ground Continuity Test
VERIFICATION
to
lowest
Resistance
measured
between 0 and 1 ohm greater than
the measured multimeter test lead
resistance.
System Grcund Test. Before proceeding with the test'
Shelf Ground Continuity Test. Each LTU shelf assem-
IF VERlFlCATION
IS NOT OBTAINED
should
be
If a reading greater ihan 2 ohms is
obtained, the faulty ground con-
installation test procedures
Same as step 3 above.
IF VERIFICATiON
IS NOT OBTAINED
should
be
If a reading greator than 1 ohm is
obtained, the faulty ground connec-
tion must be corrected before con-
tinuing
the
installation
cedures.
issue 1. May 1986
the
test pro-
3-l
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