Description
Product Description
The Bently Nevada 3500/32M 125720-01 is a full-height relay interface module designed for the Bently Nevada 3500 Machinery Protection System. It delivers four isolated SPDT relay outputs that can be independently configured for protection, interlock, alarm annunciation, or shutdown logic across monitored rotating equipment.
The module supports advanced Alarm Drive Logic, allowing relay actions to be driven by combined conditions such as Alert, Danger, Not-OK states, or Process Variable Limits (PPLs) sourced from any monitoring module within the 3500 rack. Logic operations can be structured using AND/OR combinations through the 3500 Rack Configuration Software.
Installation is supported in any rack position located to the right of the Transient Data Interface Module. Its epoxy-sealed construction and diagnostic LED indicators make it suitable for continuous operation in high-reliability industrial environments.
Key Features
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Four independent relay channels with configurable logic control
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SPDT relay architecture for flexible switching applications
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Supports Alarm Drive Logic using multi-channel voting schemes
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Accepts Alert, Danger, Not-OK, and PPL inputs from rack monitors
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Software-based configuration via 3500 Rack Configuration Software
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Epoxy-sealed relay construction for harsh environments
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Selectable relay energization mode (NE / NDE)
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Built-in LED diagnostics for module status, communication, and channel alarms
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Designed for integration into machinery protection and shutdown systems
Technical Specifications
| Parameter |
Specification |
| Brand |
Bently Nevada |
| Model |
3500/32M |
| Part Number |
125720-01 |
| Series |
3500 Machinery Protection System |
| Product Type |
4-Channel Relay Output Module |
| Module Format |
Full-height rack module |
| Relay Configuration |
4 × SPDT relays |
| Control Logic |
AND / OR programmable Alarm Drive Logic |
| Input Sources |
Alert, Danger, Not-OK, PPL signals |
| Power Consumption |
5.8 W typical |
| Module Supply Voltage |
24 VDC (rack supplied) |
| Arc Suppression |
250 Vrms integrated suppression |
| Minimum Switching Current |
100 mA @ 12 VDC |
| Max DC Switching Current |
2 A @ 0–30 VDC |
| DC Voltage Limit |
Up to 125 VDC |
| AC Switching Rating |
250 VAC max, 2 A |
| Maximum Load Power |
450 VA |
| Contact Life |
100,000 cycles @ rated load |
| Operating Temperature |
-30°C to +65°C |
| Storage Temperature |
-40°C to +85°C |
| Humidity |
95% RH non-condensing |
| I/O Module Size |
241 × 24.4 × 99.1 mm |
| I/O Module Weight |
0.4 kg |
Functional Operation
Each relay channel operates independently and can be mapped to any monitored parameter within the rack. Logic programming allows:
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Alarm aggregation across multiple channels
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Shutdown sequencing based on voting logic
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Condition-based relay triggering
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Flexible interlock design for machinery protection
This structure enables integration into turbine control systems, compressor safety shutdown loops, and plant-wide alarm systems.
Application Scope
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Turbine protection and trip systems
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Compressor and pump safety shutdown circuits
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Generator alarm and interlock logic
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Industrial rotating machinery monitoring systems
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Process plant alarm annunciation panels
FAQ
What is the primary function of the 3500/32M module?
It provides programmable relay outputs used for alarm signaling and machinery shutdown logic within a Bently Nevada 3500 protection rack.
Can each relay be configured independently?
Yes. All four SPDT outputs operate independently and can be assigned separate logic conditions.
Is the module suitable for redundant protection systems?
Yes. It is compatible with 3500 rack architectures used in high-availability protection systems.
How is the relay logic configured?
Relay behavior is defined through the 3500 Rack Configuration Software using AND/OR logic based on monitored conditions.
