SATURN
EPABX
Installation Test Procedures
issue 1. May 1986
3 . 0 1
General. The SATURN
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
in addition to the safety ground in the ac power cord.
A
(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
earth ground (refer to Section
3.00 in the SATURN
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
within the equipment
when performing
procedures with the equipment panel(s) removed.
3 . 0 2
System
Test.
Before proceeding with the test’
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
bottom of the
cabinet frame.
3 . 0 3
Shelf Ground Continuity Test.
Each LTU shelf assem-
bly within the cabinet assembly is grounded via two vertical
Beiore proceeding with the test procedures indicat-
ed in Table 3.01, check that each shelf backplane is
with the
flanges and adequately secured into
position.
Table 3.00
Ground Test
PROCEDURE
IF
IS NOT OBTAINED
If connected, remove ac power cord
from commercial power outlet.
2
Short digital multimeter
leads
together and noie resistance of test
l e a d s .
3
Set digital multimeter to lowest
Resistance measured should be
If a reading greater
2 ohms is
resistance range and connect its
0 and 2 ohms greater than
obtained, the faulty ground
leads between the U-ground pin of
the measured test lead resistance.
must be isolated and
the ac power cord and the U-ground
befora continuing
the
socket in the commercial power
installation test procedures
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
Same as step 3 above.
Same as step 3 above.
power cord if optional expansion
cabinet is incorporated into system.
Table
3.01 Shelf Ground Continuity Test
STEP
PROCEDURE
VERIFICATION
IF
IS NOT OBTAINED
1
If connected, remove ac power cord
from commercial power outlet.
2
Set digital multimeter to lowest
Resistance measured should be
If a reading
than 1 ohm is
resistance range and connect its
between 0 and 1 ohm greater than
obtained, the faulty ground
leads between ground lug
located
the measured multimeter test lead
tion must be corrected before
at the bottom of the cabinet frame,
resistance.
tinuing the installation test
and one of the
cedures.
attaching screws for each existing
LTU shelf (refer to Figure 3.01)
3-l
