Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 149986-01 (3500/33) |
| Module Type | 16-Channel Relay Output Monitor |
| Relay Contact Type | SPDT dry contact |
| Contact Rating | 2 A @ 240 VAC / 2 A @ 30 VDC |
| Logic Functions | Programmable AND, OR, channel voting |
| Power Source | Backplane powered from 3500 rack |
| Operating Temperature | -40 °C to +70 °C |
| Humidity | 5% to 95%, non-condensing |
| Rack Placement | Slots to the right of the TDI interface module |
| Mounting | Full-height 3500 rack slot |
| Compliance | API 670, UL, cULus, CE |
| Weight | 0.40 kg |
Product Introduction
The Bently Nevada 149986-01 is the 3500/33 relay module for the 3500 machinery protection rack. It receives alarm status from vibration, speed, and displacement monitors and drives external dry contact outputs. Each relay can bind to one or multiple monitor channels for custom interlock logic.
It separates protection trip contacts from network communication paths. Local relay action stays active even if gateway or host communication fails.
149986-01
149986-01
149986-01
149986-01
149986-01
Application Scenarios & Field Experience
Many protection designs rely on shared relay cards with limited channels. When a single relay module fails, multiple machine trip points go offline. This 16-channel unit lets engineers split alarm and shutdown circuits into independent, voted contact groups.
- Power generation – steam turbine lube oil and bearing vibration alarms, hardwired shutdown solenoid control
- Oil & gas – centrifugal compressor skids, separate pre-alarm and emergency trip contacts
- Petrochemical – high-speed process blowers, multi-channel voting for bearing displacement trips
- Industrial utility – gas turbine packages, local alarm lights and remote annunciator panel triggering
In my experience at a chemical plant, the original 3500/33 module had intermittent contact chatter on two trip channels. The team locked out the machine and installed a spare 149986-01. After loading the existing relay configuration, every channel validated correctly on bench test. The unit returned to service without reworking the field wiring. The chatter traced to internal relay coil degradation on the original unit.
Standard Operating Procedure (SOP) for Quality Control
- Visual & Origin Inspection: Check OEM faceplate marking, serial formatting, and seal integrity; inspect connector pins for damage or rework marks.
- Live Rig Testing: Install in a 3500 test rack, trigger simulated alarm states, verify relay pull-in and drop-out for all 16 channels.
- Firmware Verification: Log firmware revision and cross-check compatibility with the target rack firmware stack.
- ESD-Safe Packaging: Use static-dissipative bag and foam; include signed test report before carton sealing.
Frequently Asked Questions
Q1: Does 149986-01 work with all 3500 rack firmware builds? A: Older rack firmware may not expose all voting logic options. Run an offline configuration check to confirm feature support before installation.
Q2: What warranty do you provide on this unit? A: We offer 12 months from shipment date. The warranty covers confirmed hardware failure; it does not cover contact burnout from overcurrent, miswiring, or incorrect logic setup.
Q3: How fast can this unit ship if it is in stock? A: Stock units ship within 1–3 business days after payment confirmation. Confirm stock status before scheduling your shutdown window.
Q4: Can firmware mismatch prevent relay voting logic from activating? A: Yes. Mismatched revisions can disable multi-channel voting or lock relay channels in a fixed state. Match the firmware version used at commissioning.
Q5: Can I hot-swap this relay module while the machine is running? A: Hot-swap is allowed for the module itself, but any trip logic assigned to its channels will be unavailable during the swap. Do not hot-swap if the channels are part of an active safety shutdown loop.
