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Home ⊙ NEWS ⊙ A-B Line Synchronization Module (Bulletin 1402 LSM) Installatio
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A-B Line Synchronization Module (Bulletin 1402 LSM) Installatio

From:A-B | author:Mr.Chen | Time :2024-11-07 | 113 view: | Share:

Location

The Bulletin 1402 Line Synchronization Module (LSM) should be installed in a Bulletin 1771 I/O chassis that is located in a dry, 

dirt free environment away from heat sources and very high electric or magnetic fields. 

The module is designed to operate in an ambient temperature between 0 and 60° Celsius. 

The LSM is typically installed in a local rack in order to maximize data transfer rates.

Enclosure

This equipment is classified as open equipment and must be installed (mounted in an enclosure during operation as a means of providing safety protection. 

The enclosure chosen should protect the LSM from atmospheric contaminants such as oil, moisture, dust, corrosive vapors, or other harmful airborne substances. 

A steel enclosure is recommended to guard against EMI (Electromagnetic Interference) & RFI (Radio Frequency Interference). 

The enclosure should be mounted in a position that allows the doors to open fully. 

This will allow easy access to the wiring of the LSM and related components so that servicing is convenient. 

When choosing the enclosure size, extra space should be allowed for associated application equipment such as, transformers,

fusing, disconnect switch, master control relay, and terminal strips.

Mounting

The LSM mounts in two slots of a Bulletin 1771 Series B, I/O chassis. Mounting dimensions will vary with the size of the chassis selected. 

Refer to the appropriate 1771 literature for specific dimensions.

Power Supply

The LSM backplane power requirement is 1.1A at 5V DC. Refer to the appropriate 1771 literature for additional information on available power supply current.

Chassis Grounding

For correct and reliable performance, the grounding recommendations specified for Allen–Bradley PLC systems must be followed.

Swing Arm

The LSM requires the use of a Cat. No. 1771-WC (10 position, gold contacts) Swing Arm.

Wiring

There are two sets of terminals associated with the LSM; a 10 position swingarm and an 8 position fixed terminal block. 

All customer wiring to the LSM is accomplished via these terminals on the front of the module. 

The 10–position swingarm is used to make all of the voltage (PT) connections to the module as well as the Load Share connections. 

These connections are designed to accommodate wire size 0.5 mm2 (22 AWG) through size 2.0 mm2 (14 AWG). 

The 8–position fixed terminal block is used to make all of the current (CT) connections. 

These connections are designed to accommodate gauge wire size 0.5 mm2 (22 AWG) through ring lugs size 3.25 mm2 (12 AWG). 

Phasing and polarity of the AC current and voltage inputs and their relationship are critical for the correct operation of the unit. 

Figure 2.1 through Figure 2.5 shown on Pages 2–7 through 2–11 provide wiring diagrams to help ensure correct installation. 

Two (2) conductor shielded wire (22 gauge or greater) should be used for Load Share wiring.

The shield shall be grounded at the PLC Chassis ground point only.

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