Siemens TL.. Manual de Instruções descarregar pdf (Página 35)

External Accessories

Siemens ACCESS Communications System

B. SB Breaker ACCESS Communications (with or

without Zone Interlocking)

1. Standard type ‘TL’ switch-based trip unit

Components Required:

• Siemens type MTZ – one per 8 trip units

• Siemens type EPSB expansion plug – one per trip unit,

factory wired

• Siemens type MTCSB cable – one per trip unit

Inst

allation:

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 cable’s spade lugs to the appropriate SB breaker’s

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 site’s

coordination study, conﬁgure the expansion plug’s DIP

switches for Short Time and/or Ground Fault ZSI per the

expansion plug’s Information and Instruction Sheet. Conﬁg-

ure the MTA to identify the zones for each breaker, per the

site’s coordination study and the MTA’s instruction sheet.

3. If multiple MT’s are used, the “Com” terminal from the ﬁrst

MT’s “SEABus Out” port must

be connected to the “Com”

terminal of the next MT’s “SEABus In” port on each MT

being used.

4. If ZSI is not required, set the expansion plug’s DIP switches

to NO ZONE (0000), the MTA’s De

vice Conﬁguration DIP

switches to NO ZONE (00) and the De

vice Type MTA’s D IP

switch to MCCB/ICCB (0001).

5. Connect RS-485 twisted pair communication cable to the

MTA’s A(+) and B(-) terminals. Connect only

one end of the

cable’s shield to the MT’s GND terminal. Conﬁgure the

ACCESS system network, per Installing the ACCESS Sys-

tem 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 MT’s are used for ZSI functionality, the “Com” ter-

minal from the ﬁrst MT’s “SEABus Out” port must

be con-

nected to the “Com” terminal of the next MT’s “SEABus In”

port on each MT bing used.

As referenced in the SB-EC Trip Unit Information and Instruc-

tion Manual, the trip unit’s 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.

Summary

The following table summarizes the required

Component

Types per each trip unit in the system. One component per

trip unit unless otherwise otherwise noted:

Component Selection Guide



Notes:

1. It is recommended that for long, single-ended runs (over 1000 ft.),

that a 120 ohm, 1/4 watt terminating resistor between the Data+ and

Data- terminals of the furthest devices be added. Adding a terminator

resistor is not an absolute requirement, but using it will minimize re-

ﬂected interference on the communication bus.

2. Both loop and straight RS-485 topologies are acceptable. The advan-

tage of the straight topology is further distance to the last device

(4000 ft.) The advantage to the loop topology is that the devices will

continue to communicate even with a break in the line. The disadvan-

tage of the loop topology is the distance to the furthest device is only

2000 ft.

3. A Siemens Isolated Multi-Drop Converter (Cat. No. 18-658-852-537)

may be used as an optional device used to convert four (4) RS-485

communications loops to one (1) RS-232 port for host PC communi-

cations.

4. Protocol converters are available from the Siemens ACCESS group to

provide plug-and-play capability with over 25 different PLC protocols

(Siemens S7, Modbus, etc.), Proﬁbus, DeviceNet, and LonWorks.

5. If multiple MT’s are used for ZSI applications, the “Com” terminal

from the ﬁrst MT’s “SEABus Out” port must be connected to the

“Com” terminal of the next MT’s “SEABus In” port on each MT being

used.

6. Installed ICCB SB breakers without communication capability may be

ﬁeld upgraded by Siemens Field Service personnel only. MCCB

breakers may be ﬁeld upgraded by Siemens Field Service or the end

user.

7. Refer to Installing the ACCESS System Installation Guide (Manual

SG-6028-01) for proper system shield and grounding connections

schemes.

Note: Refer to the MT and EPSB installation instructions included with

each device for additional information.

Trip Units and Application

Component

Type

ZSI

(only)

with

Sensitrip

MCCB’s

ACCESS

and/or ZSI

with

Sensitrip

MCCB’s

ZSI (only)

with all

SB-EC

Trip Units

ACCESS

and/or

ZSI with

SB-TL

Trip Units

ACCESS

with

SB-EC

Trip

Units

✔✔

EPSB

✔✔

MTZ



✔✔

MTA



✔✔

EPC Cable

✔✔

MTC Cable



✔✔

MTCSB Cable

✔✔



When ordered with circuit breaker from the factory.



One MTA or MTZ per eight trip units when required.



Always required when multiple T’s are used. One additional cable per each

additional MT.

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