Contactor,circuit breaker,sensor,Encoder,PLC,Converter
Brand affiliation: Bently Nevada (now Baker Hughes). It belongs to the 3500 series TSI machinery protection system, a full-height rack card, base part number for ordering: 149992-01
- Model Code Explanation: 3500/33-A01-B00
3500: 3500 TSI machinery protection system
/33: 16-channel relay output module
A01: Segment A = output version; 01 = standard 16-channel SPDT relay output
B00: Segment B = certification option; 00 = no CSA/NRTL/C certification (B01 version with CSA certification)
Distinction: The 3500/32M is a 4-channel relay module. It differs in channel quantity and logic resources and cannot be directly interchanged.
- Core Technical Specifications
| Item | Specification |
| Number of Channels | 16 independent relays, SPDT dry contacts |
| Contact Rating | Resistive load: max. 2A @30VDC / 0.5A @125VAC; epoxy-sealed relays |
| Mounting Position | 3500 rack, any slot on the right side of the RIM rack interface. Multiple 3500/33 modules can be expanded within one rack |
| Operating Temperature | -30℃ ~ +65℃ (control cabinet ambient) |
| Module Status Indicators | OK LED, TX/RX communication LED, independent status LED for each of the 16 relays |
| Configuration Software | 3500 Rack Configuration software; System 1 can retrieve events |
| Logic Types | Each relay channel is independently configurable. Supports AND/OR logic, 2ooN voting, latch function and delay setting |
| Trigger Sources | Any monitoring card in the rack: Alert warning, Danger trip, Not OK module fault signals |
| Function Definition | Does not acquire sensor signals. Provides logic outputs only for interlocks, shutdowns and dry contact alarms to DCS |
| SIL | The complete 3500 system has SIL2 certification (full architecture assessment required) |
- Core Functions
- 16 independent programmable relays: Each channel can select its trigger source separately for dry-contact protection outputs such as shaft vibration, axial displacement, differential expansion and speed.
- Flexible voting logic: Supports 1-out-of-2, 2-out-of-2 and multi-channel voting to reduce false trip and fail-to-trip risks. Latch function is available with software-selectable reset modes.
- Relay delay configuration: Debounce delay can be set to filter transient spike alarms and prevent spurious operations.
- Module self-diagnostics: Card self-test, backplane communication fault and relay loop diagnostics. Faults are reported to the system event list.
- Event logging: Relay activation and module fault data are stored in the rack event log for post-fault root cause analysis.
- Typical Application Scenarios
TSI protection for steam turbines, centrifugal compressors, axial fans, generators and large pump sets; Petrochemical, thermal power and coal chemical industries.
Applications: Unit hazardous condition shutdown trip circuits, local audible & visual alarms, dry contact signal transmission to DCS/SIS and solenoid valve actuation.
- Installation & Configuration Guidelines
- Rack: Standard 19-inch 3500 rack with backplane communication. Hot-swap is supported (interlocks must be removed before operation).
- Wiring: Relays use dry contacts. Mixing high AC/DC power cables with intrinsically safe cables is strictly prohibited. Shielded cables are recommended separately for trip circuits.
- Configuration Procedure
Connect PC to the rack and launch Rack Configuration software to identify the rack.
Select the 3500/33 card, choose trigger source for each channel (e.g. Danger signal from 3500/42M vibration channel).
Configure logic: AND/OR, voting mode, latch and action delay.
Download configuration to rack, perform module self-test and simulate alarms to verify relay operation.
- Testing: Relay outputs can be forced in software to conduct on-site loop joint testing.
- Common Troubleshooting Checklist
- OK LED flashing at 1Hz: No valid configuration downloaded to the card → Re-download rack configuration and run self-test.
- Abnormal TX/RX flashing: Backplane communication fault. Inspect backplane and RIM module, re-seat the card.
- Relay does not actuate when alarm condition is met: Verify configuration logic, voting rules and delay parameters; force output to test relay hardware integrity.
- Relay actuates but no signal in external loop: Check terminal wiring, contact erosion and external loop power supply.
- Flash fault event reported: Module flash memory damaged; card replacement required.
- Alternative & Comparison within Series
Bently Nevada 3500/33-A01-B00 16-Channel Relay Module
3500/33-A01-B01: Identical hardware with CSA NRTL/C certification, commonly used for overseas projects
3500/32M: Only 4 relay channels, fewer points for small units
Spare part replacement note: Segment A and B of model number must match, and configuration needs to be re-downloaded.
