Typical Applications
The 3500/33-02-00 is commonly used in:
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Steam turbines
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Gas turbines
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Compressors
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Pumps
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Generators
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Electric motors
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Fans
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Process machinery
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Oil & gas facilities
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Power generation plants
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Petrochemical processing
Typical functions include:
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Emergency shutdown (ESD)
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Alarm annunciation
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Process interlocks
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Equipment trip logic
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Auxiliary control outputs
Key Features
Sixteen Independent Relay Outputs
Provides 16 individually programmable SPDT relays, allowing multiple alarm, shutdown, or process control functions within a single module.
Failsafe Relay Design
The -02 configuration incorporates failsafe relay outputs, ensuring that relay contacts automatically assume their predefined safe condition during power loss or module failure, improving overall machinery protection reliability.
Flexible Alarm Drive Logic
Each relay can be programmed using AND/OR voting logic based on:
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Alert alarms
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Danger alarms
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Not-OK status
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Individual monitor variables
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Multiple monitor channels
This flexibility enables customized shutdown and annunciation strategies.
Modular Rack Installation
The module occupies one full-height slot and can be installed in any relay slot to the right of the 3500/22M Transient Data Interface (TDI). Multiple 3500/33 modules may be installed within the same rack as required.
API 670 Machinery Protection
The 3500 System, including the 3500/33 Relay Module, is designed for machinery protection applications that comply with API 670.
Frequently Asked Questions
1. What is the difference between 3500/33-01-00 and 3500/33-02-00?
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3500/33-01-00 uses standard relay outputs.
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3500/33-02-00 uses failsafe relay outputs, which move to their safe state upon loss of power or module fault.
2. How many relay outputs are available?
The module provides 16 independently programmable SPDT relay outputs.
3. Can each relay be programmed independently?
Yes. Each relay supports independent Alarm Drive Logic configured through the 3500 Rack Configuration Software.
4. Does this module have hazardous-area approvals?
No. The -00 option indicates no hazardous-area approvals. Versions with -01 or -02 approval options are available for certified hazardous locations.
5. What type of relay contacts are used?
The module uses SPDT (Single-Pole Double-Throw) relay contacts.
6. Where is the module installed in the rack?
It installs in any available relay slot located to the right of the 3500/22M TDI Module.
7. Is it compatible with all 3500 monitor modules?
Yes. Relay logic can be driven from alarm conditions and status information generated by compatible monitor modules within the same 3500 rack.
8. What software is required for configuration?
Configuration is performed using the 3500 Rack Configuration Software, which allows programming of relay logic, voting, and alarm responses.
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