Description
Product Introduction
The 3500/32M (149986‑02) is a full‑height 4‑channel configurable relay control module for the Bently Nevada 3500 machinery protection rack systemBaker Hugh…. It provides four independent SPDT relay outputs with powerful built‑in Alarm Drive Logic, supporting flexible AND / OR voting‑logic configuration via 3500 Rack Configuration SoftwareBaker Hugh….
Each relay channel can reference Alert, Danger, Not‑OK, or any PPL status signal from all monitor channels inside the rack. Users may set each relay for normally‑energized or normally‑de‑energized operation via hardware switch, and enable latching function for safety interlock scenariosMoore Auto…. Relays adopt epoxy‑sealed construction with factory‑fitted arc suppressors for heavy‑duty industrial environments. This module must be installed in slots to the right of the 3500/22 TDI (Transient Data Interface) module inside the rack.
3500/32M 149986‑02
Key Technical Specifications
| Item | Parameter |
|---|---|
| Model / Part Number | 3500/32M, 149986‑02 |
| Module Type | 4‑Channel Relay Control Module, full‑height front slot + rear I/O slot |
| Relay Contact | SPDT (Form‑C), epoxy‑sealed, built‑in 250 Vrms arc suppressor |
| Contact Rating | 5 A @240 VAC / 30 VDC; mechanical life 100 000 cycles @ rated loadMoore Auto… |
| Power Supply | 24 VDC from rack backplane (18‑32 VDC operating range) |
| Typical Power Consumption | 5.8 W |
| Logic Feature | Per‑channel independent voting logic; AND / OR combination; latching selectable; NO/NE hardware switch per channelBaker Hugh… |
| Status LED | OK (module health); TX/RX (backplane communication); CH ALARM (per‑channel alarm status)Baker Hugh… |
| Operating Temperature | ‑30 °C ~ +65 °C (‑22 °F ~ +150 °F)Moore Auto… |
| Storage Temperature | ‑40 °C ~ +85 °C |
| Humidity | 0‑95 % RH, non‑condensing |
| Physical Dimension | 241 mm × 24.4 mm × 242 mm (main module) |
| Weight | 0.7 kg |
| Software Requirement | Rack Configuration Software V4.50 or higher; DAQ Software V2.40 or higher |
Typical Applications
- Power Generation: Steam turbine, gas turbine and hydro‑turbine machinery protection; multi‑condition voting for alarm and trip interlock signals.
- Petrochemical & Refinery: Large centrifugal compressors, blowers, critical process pumps; multi‑source combined‑logic fault output.
- Heavy‑Industry Rotating Equipment: Fans, expanders, turbo‑machinery; implement voting‑trip logic (2‑out‑of‑3, 1‑out‑of‑2 etc.) without external PLC logic.
- 3500‑System Expansion: Add dedicated trip‑relay channels when monitor‑on‑board relay capacity is insufficient; interface with DCS, ESD, local alarm annunciator panels.
Note: Distinguish from 3500/33: 3500/32M is 4‑channel high‑capacity contact for trip interlock; 3500/33 is 16‑channel low‑current signal‑dedicated relay module for alarm expansionBaker Hugh….
Common Technical Pitfalls & Avoidance Guidelines
4.1 Mandatory 3500/22 TDI dependency
3500/32M will not operate correctly without a 3500/22 TDI module installed left‑side in rack. Installation in slots left of TDI will cause communication failure and all‑channel offline status. Always follow rack slot ordering rules.
4.2 Over‑rating relay contacts
Although rated 5 A, avoid continuous full‑load operation. Inductive loads (contactors, solenoids) must add external surge‑suppression. For heavy‑load tripping circuits, use intermediate isolation relays to protect module internal contacts.
4.3 Mis‑configuration of Normally‑Energized / Normally‑De‑Energized
Improper hardware switch setting combined with software latching will produce false trips or fail‑safe loss. Verify hardware switch setting matches your fail‑safe philosophy (de‑energize‑to‑trip or energize‑to‑trip) before commissioning.
4.4 Mismatched software / firmware version
Out‑dated rack firmware or configuration software leads to missing logic options, download failure or relay mis‑fire. Confirm software version ≥ V4.50. When paired with display modules (3500/93, 3500/94), enforce required display firmware revisions.
4.5 Condensation & poor cabinet thermal management
95 % RH rating applies only for non‑condensing. Condensing environment corrodes epoxy‑sealed relays and causes intermittent short‑circuit or random relay actuation. Install cabinet dehumidification and temperature control for field cabinets.
4.6 Grounding and EMI interference
Separate relay field wiring from high‑power motor cables. Follow official 3500 single‑point grounding specification. Mixed‑potential ground loops may trigger spurious relay switching.
Related & Compatible Products
Host Rack & Mandatory Companion
- 3500 series rack chassis; 3500/22 TDI Transient Data Interface Module (mandatory)
- 3500 rack power supply modules
Paired Monitor Modules
- 3500/40M Proximity Monitor (vibration / displacement input for relay‑voting)
- 3500/42M Velocity‑Acceleration Monitor
- 3500/50M Temperature Monitor
- 3500/62 Process Variable Monitor
Peer Relay Modules
- 3500/33 (149992‑03): 16‑channel low‑current signal‑relay for alarm expansion (compare with 3500/32M 4‑channel heavy‑contact trip relay)Baker Hugh…
Auxiliary Accessories
- Intermediate isolation relay assemblies for inductive‑load protection
- 3500 rear I/O termination modules
- Rack configuration software and communication interface for relay‑logic download
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