Description
Product Introduction & Engineering Value
Most racks need more than just monitoring — they need to act when something goes wrong. The Bently Nevada 3500/33 with part 149986-01 gives you sixteen independent relays that you can program with almost any combination of alarm conditions from the monitors. This turns raw vibration and position data into real-world control actions.
Paired with its matching I/O module, it offers flexible voting logic and latching options that match your plant’s specific safety requirements without extra hardware.
Technical Specifications
Relay Details
- 16 SPDT (Form C) relays
- Contact Rating: 5A @ 24 VDC or 120 VAC resistive
- Arc suppression and epoxy sealing standard
Logic Capabilities
- Independent programming per relay
- AND/OR combinations from any monitor channels
- Time delays and latching configurable
Environmental & Physical
- Operating Temperature: -30°C to +65°C
- Power Consumption: 5.8 watts typical
- Full-height module with front panel status LEDs
Field Application & The “Trench” Experience
A Midwest ethanol plant kept experiencing unexplained trips on their main dryer fan. After reviewing the logic in the 149986-01, we found overly aggressive single-channel settings. Reprogramming with proper 2oo3 voting on key parameters stopped the false trips while preserving protection. The dryer ran reliably through the rest of the campaign.
- 3500/33 149986-01
- 3500/33 149986-01
Niche Applications
- Grouped shutdown logic for multi-compressor trains in refrigeration systems
- Custom annunciation panels in power generation auxiliary systems
- Voting-based trips for critical lube oil and seal gas systems
Transparency SOP: QA & Testing
We install each 149986-01 main module with its I/O board in a test rack and program sample logic configurations. Every relay gets cycled under load while we verify contact resistance, isolation, and response time. Extended operation confirms no chatter or overheating before the unit ships with its test summary.
The Veteran’s Tech Trap Guide
⚠️ I/O Pairing — The 149986-01 main module requires the correct I/O board (such as 149992-01). Mismatching creates immediate faults.
PRO TIP: Export your relay logic configuration before any module swap so you can reload it quickly.
⚠️ Contact Loading — Respect the 5A rating. Heavy inductive loads without flyback diodes will shorten relay life dramatically.
Dynamic FAQ
Q: How many channels does the 3500/33 provide? A: Sixteen independent relay channels per module.
Q: Can relays be programmed for complex voting? A: Yes, including AND/OR logic across multiple monitor alarms and statuses.
Q: What is the contact rating on these relays? A: 5A resistive at 24 VDC or 120 VAC.
Q: Does New Surplus come with a warranty? A: Yes, one year on parts and workmanship.
Q: Is the module hot-swappable? A: Yes, you can replace it while the rack is running.
Q: Do I need special software to configure the relays? A: The standard 3500 Rack Configuration Software handles all logic programming.
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