Installation And Operation; Separating The Inner And Outer-Chassis; Test Plugs And Ft Switches; External Wiring - ABB REL 301 Instruction Leaflet

4. 1.

SEPARATING THE INNER AND OUTER-CHASSIS

It is recommended that the user of this equipment become acquainted with the information in
these instructions before energizing the REL 301/302 and associated assemblies. Failure to ob-
serve this precaution may result in damage to the equipment.
All integrated circuits used on the modules are sensitive to and can be damaged by the dis-
charge of static electricity. Electrostatic discharge precautions should be observed when oper-
ating or testing the REL 301/302.
Use the following procedure when separating the inner chassis from the outer
chassis; failure to observe this precaution can cause personal injury, undesired
tripping of outputs and component damage.
a. Unscrew the front cover knob and remove cover.
b. Open all FT switches completely.
Do Not Touch the outer contacts of any FT-10 switch; they may be energized.
c. Release frame latches by pushing the top and bottom latches inward towards the center of
the relay.
d. The inner chassis removal lever is located on the left center (vertical mount) or on top cen-
ter (horizontal mount) of the inner chassis. Push the lever towards the middle tab on the
frame.
e. Slide out the inner chassis.
f. Reverse procedures above when replacing the inner chassis into the outer chassis.
4. 2.

TEST PLUGS AND FT SWITCHES

Test Plugs are available as accessories (Section 1.6.6). They are inserted into the FT-10 switch-
es for the purpose of System Function Tests.
4. 3.

EXTERNAL WIRING

All electrical inputs/outputs are made through the back of the REL 301/302. Figure 4-1 illus-
trates where the different input/output signals are located. The vertical REL 301/302 is used as
a reference in the location column of the Connection Specification Chart (similarly for the hori-
zontal REL 301/302). Note: If the separate polarizing input (FT-12 and FT-13) is not used,
a shorting jumper must be installed.
Section 4. INSTALLATION AND OPERATION
!
CAUTION
!
WARNING
I.L. 40-386.4
4-1