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Technical specifications for 125720-02
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Manufacturer:Bently Nevada
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Product Category:Machinery Monitoring Systems
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Spare Part Number:125720-02
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Estimated shipping dimensions:2.3x11x24cm
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Weight:0.45 kg
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Tariff Code:8537101190
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Counliy of origin:USA
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Associated module:3500/32M 4-channel relay module
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Spare role:Relay output module
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System class:Hazardous-area and functional-safety systems
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Relay channels:Four
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Relay type:Single-pole, double-throw
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Drive logic:Configured by the associated 3500/32M control module
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Voltage rule:Use restricted ratings for hazardous-area or functional-safety systems
Information
Overview
Manuals
Common Applications
Product Precautions
Bently Nevada 125720-02 provides the controlled four-relay output hardware used by hazardous-area or functional-safety 3500/32M applications.
- Provides four SPDT relay output channels.
- Supports the hazardous-area and functional-safety hardware execution.
- Receives Alarm Drive Logic from the associated relay control module.
- Allows normally energized or normally de-energized channel operation as configured.
The output module switches field circuits according to the configured 3500 alarm logic. Contact ratings, hazardous-area voltage limits and functional-safety restrictions must be checked before wiring.
Important Notice: Confirm the rack drawing calls for 125720-02 before replacing the relay output board. Record field-circuit response, fail-safe state and proof-test evidence before release.
Bently Nevada 125720-02 Manuals & Downloads
Bently Nevada 125720-02 Official Technical Reference Excerpt (PDF)Bently Nevada 125720-02 Installation & Commissioning Guide (PDF)
The first document covers the product function, system role and technical selection. The installation guide covers identification, connection checks, commissioning and the acceptance record.
Alarm annunciation
Switches configured Alert, Danger or Not-OK logic to external circuits.
Protective trip interface
Provides controlled relay contacts for machinery protection logic.
Functional-safety output
Uses the restricted voltage execution required by the certified system.
Hazardous-area rack service
Replaces the output board without changing the validated relay logic.
Before installing Bently Nevada 125720-02, confirm the documented system, interfaces and controlled configuration.
1
Confirm the rack drawing calls for 125720-02 before replacing the relay output board.
2
Isolate every field voltage and verify zero energy at the relay terminals.
3
Keep hazardous-area and functional-safety voltage restrictions with the replacement module.
4
Label common, normally-open and normally-closed conductors before disconnection.
5
Inspect connector headers and the associated control module for damage.
6
Restore each channel's energized/de-energized selection and Alarm Drive Logic.
7
Perform a controlled relay pickup and dropout test on all four channels.
8
Record field-circuit response, fail-safe state and proof-test evidence before release.
Technical notes
Confirm the rack drawing calls for 125720-02 before replacing the relay output board. Record field-circuit response, fail-safe state and proof-test evidence before release.
FAQ View All FAQ
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Which 3500 module family accepts 125720-02?It is the spare relay output module for the 3500/32M 4-channel relay module.
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How many relay channels are provided by 125720-02?It provides four output channels.
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Which system classes specifically use 125720-02?It is designated for hazardous-area and functional-safety systems.
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Why are standard-system voltage ratings not automatically valid for 125720-02?Hazardous-area and functional-safety certificates impose restricted voltage limits.
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Where is relay voting logic created for 125720-02?The associated 3500/32M control module executes the configured AND/OR Alarm Drive Logic.
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Which contact states must be recorded before changing 125720-02?Record common, normally-open and normally-closed wiring for every channel.
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How should the fail-safe choice be confirmed on 125720-02?Verify the normally energized or normally de-energized selection against the approved cause-and-effect record.
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What final proof test is required for 125720-02?Drive every channel through pickup and dropout and verify the connected alarm or trip circuit response.
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