Description
The 3500/32-01-01 is a 4-channel, full-height relay module designed for the Bently Nevada 3500 Machinery Protection System. It provides four software-programmable Single-Pole Double-Throw (SPDT) relay outputs. Each relay can be independently configured to drive field control loops, trip interlocks, or annunciator panels based on “Alert” and “Danger” alarm statuses generated by other monitoring modules within the same rack.
The part number breakdown for the -01-01 suffix specifies:
- -01 (Output Module): 4-Channel Relay Output Module
- -01 (Agency Approval Option): CSA/NRTL/C (Class 1, Division 2, Groups A, B, C, and D)
Technical Specifications
| Parameter | Specification / Value |
| Brand | Bently Nevada (Baker Hughes) |
| Model Series | 3500 Series Machinery Protection |
| Part Number Configuration | 3500/32-01-01 |
| Relay Outputs | 4 x SPDT (Single-Pole Double-Throw) dry contacts |
| Maximum Contact Voltage | 250 V AC / 30 V DC |
| Maximum Switched Current | 5.0 A AC or DC (resistive load) |
| Maximum Switched Power | 1,250 VA / 150 W |
| Contact Life Rating | 100,000 operations at rated load |
| Minimum Contact Load | 100 mA at 5 V DC |
| Backplane Current Draw | 250 mA at 5 V DC maximum |
| Operating Temperature | −30 to +65 °C (−22 to +150 °F) |
Field Application and System Integration Notes
Logic Matrix Configuration
The 3500/32-01-01 does not rely on physical jumpers for alarm linking. Relay drive logic is mapped using the 3500 Rack Configuration Software via an internal voting matrix.
- Voting Capabilities: Relays can be driven by a single channel status or bound to complex Boolean logic structures (e.g., 1-out-of-2, 2-out-of-2, or NOT logic) across multiple monitor channels in the rack.
- Energize Modes: Each relay channel is individually configurable as Normally De-energized (relays change state only on an active alarm trip) or Normally Energized (relays are held energized during normal operation, providing a fail-safe trip if the 3500 rack completely loses power).
Failsafe Adjustments and Time Delays
- Latching vs. Non-Latching: If set to Latching mode, the relay remains in its tripped state even after the machine vibration subsides below the setpoint threshold, requiring an explicit hardware or software “Reset” command. Non-Latching configuration forces the relay to reset automatically once the alarm condition clears.
- Alarm Time Delay: A programmable delay (ranging from 0.1 to 60 seconds) can be applied to each channel to mask transient vibration spikes (such as those caused by brief structural resonances during machine startup) from triggering a false machine trip.
Hardware Dependencies
The main 3500/32 processor card must be paired with its specific 4-Channel Relay Terminal Assembly mounted directly behind it in the rear of the rack to terminate the field wiring.
- Arc Suppression: When switching inductive field loads (such as heavy-duty interposing relay coils or solenoid valves), you must install external arc suppressors (diodes for DC circuits, RC networks for AC circuits) across the load terminals to prevent high-voltage back-EMF spikes from pitting the internal gold-plated relay contacts.
Commercial and Procurement Data
- Product Condition: New Original (Factory Sealed) or Refurbished/Tested Surplus (includes contact resistance test documentation).
- Standard Warranty: 12-month comprehensive warranty from the date of dispatch.
- Estimated Lead Time: In-stock configurations ship globally within 1 to 2 business days.
- Pricing Notice: The market cost for 3500 modules varies based on certified hazardous area compliance and supply pipeline availability. Contact our technical sales division for a formal, customized commercial quote.
