Siemens Energy & Automation, Inc.
Bellefontaine, OH 43311 U.S.A.
Page 5 of 7
Hazardous voltage.
Will cause death or serious
injury.
Turn off and lock out all power supplying
the circuit breaker prior to cover(s) removal
or while cover(s) are removed and when
installing any internal or external accessory.
Replace the cover(s) and shield(s) before
power supplying this device is turned on.
Installation:
1. When the factory-installed ACCESS communications option is present, the EPSB expansion plug is already wired
to the breaker and secondary control terminals. Connect an MTCSB cables spade lugs to the appropriate SB
breakers secondary terminals (LB9, 10, 11, & 12) then to one of eight communication inputs on the MTA.
2. If ZSI functionality is additionally required, per the sites coordination study, configure the expansion plugs
DIP switches for Short Time and/or Ground Fault ZSI per the expansion plugs Information and Instruction
Sheet. Configure the MTA to identify the zones for each breaker, per the sites coordination study and the
MTAs instruction sheet.
3. If multiple MTs are used, the Com terminal from the first MTs SEABus Out port must be connected to the
Com terminal of the next MTs SEABus In port on each MT being used.
4. If ZSI is not required, set the expansion plugs DIP switches to NO ZONE (0000), the MTAs Device Configu-
ration DIP switches to NO ZONE (00) and the Device Type MTAs DIP switch to MCCB/ICCB (0001).
5. Connect RS-485 twisted pair communication cable to the MTAs A(+) and B(-) terminals. Connect only one
end of the cables shield to the MTs GND terminal. Configure the ACCESS system network, per Installing the
ACCESS System manual. An Isolated Multidrop Converter may be installed as an option. See figure 1 for
system connection diagram.
2. SB-EC Trip unit
Since the SB-EC Trip Unit has direct communications with an ACCESS network, no intermediate devices are
required unless ZSI functionality is required.
If ZSI is required, connect as per above using an MTA if type TL SB breaker trip units or Sensitrip MCCB trip
units are part of the overall system and both ACCESS communications and ZSI are required
Any application requiring only ZSI requires an MTZ configured as above.
If multiple MTs are used for ZSI functionality, the Com terminal from the first MTs SEABus Out port must be
connected to the Com terminal of the next MTs SEABus In port on each MT being used.
As referenced in the SB-EC Trip Unit Information and Instruction Manual, the trip units ACCESS communication
lines are located on the breakers secondary control terminals <LB5> to RS485(+), <LB6> to RS-485(-), and
<LB7> to Shield/Common. Refer to figure 1 for system connection diagram.
Installing Sensitrip
TM
and SB Electronic Trip Units In Zone
Selective Interlocking or ACCESS
TM
Communications Systems
(20 Seiten)
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