ABB REL300 Instruction Manual page 99

I.L. 40-385.7
3) Slide out the inner chassis.
4) Close all FT-14 switches.
5) Replace the FT-14 covers.
d. Reverse procedures above when replacing the inner chassis into the outer chassis.
4.2 TEST PLUGS AND FT-14 SWITCHES
Test Plugs are available as accessories (see Table 3-2, page 3-52); they are inserted into the
FT-14 switches for the purpose of System Function Tests. When the Test Plugs are inserted,
the FT switch #13 (BP) and #14 (BN) must remain closed.
4.3 EXTERNAL WIRING
All external electrical connections pass through the Backplate (Figure 2-9, page 2-14) on the
outer chassis. If the REL300 is used without the FT-14 switch, six 14-terminal connectors on
the Backplate (TB1 through TB6) are used. If the FT-14 switch (option) is included, using the
two peripheral areas of the REL300 cabinet, then only four of the 14-terminal connectors (TB2
through TB5) are used. Three DIN connectors (J11, J12, J13) allow for the removal of the outer
chassis (Backplane module) from the inner chassis (Interconnect module).
Electrical inputs to the Backplane module, which are routed either directly through the Back-
plate or through the FT-14 switch to the Backplate, include:
• V A , V B , V C and V N
• I A /I AR , I B /I BR , I C /I CR , and I P /I N
• BP (48, 125 or 250 Vdc) and BN (negative)
Analog input circuitry consists of four current transformers (IA, IB, IC, and IN), three voltage
transformers, (VA, VB and VC), and low-pass filters. The seven transformers are located on the
Backplane PC Board (see Appendix A). The primary winding of all seven transformers are di-
rectly-connected to the input terminal TB6/1 through 12 (see Functional Block Diagram, Appen-
dix J); the secondary windings are connected through the Interconnect module to the Filter
module.
Dry contact outputs for breaker failure initiation (BFI), reclosing initiation (RI), reclosing block
(RB), failure alarm (AL1), trip alarm (AL2), SEND and STOP are located on the Backplane PC
Board. Optical isolators are for Pilot Enable, External Reset, Receiver #1 and #2, 52a, 52b,
SBP (89b) and studs for chassis ground (GND) and location for the Communication Interface
are also shown.
The power system ac quantities (Va, Vb, Vc, Vn, Ia, Ib, Ic and In), as well as the dc source are
connected to the left side FT-14 switch (front view). All the trip contact outputs are connected
to the right-side FT-14 switch (front view). Switches 13 and 14 on FT-14 may be used for dis-
abling the Breaker Failure Initiation/Reclosing Initiation (BFI/RI) control logic. (See also external
connections, Block Diagram, Appendix J.)
The INCOM
mounted through the Backplate of the outer chassis and connected to the Backplane module,
and remote settings (see section 4.7, page 4-8).
4-2
®
or RS232 PONI (Product Operated Network Interface) communication box is