Bently 172103-01 65小卡 RTD / Isolated‑Tip TC Rear I/O Small Card (Internal Terminations)

Description

Hardware Specifications

• Part Type: Temperature input rear I/O small‑card with internal terminations, dedicated pairing for 3500‑65 front‑end 16‑channel temperature monitor module, standalone operation invalid
• Mounting: Rear slot position of 3500‑05 rack, front‑rear paired‑slot architecture, directly mounted behind 3500‑65 front‑end temperature monitor module
• Termination: Four groups of internal plug‑in screw terminal blocks, total 16‑channel for 3‑wire /4‑wire RTD and isolated‑tip thermocouple sensors; no vibration or speed sensor interfaces
• PCB: Conformal‑coated multi‑layer FR‑4 PCB, delivers anti‑corrosion protection for long‑term continuous operation under oily, dusty industrial cabinet environment
• Mechanical Form: Standard 3500‑series rear small‑card footprint; net weight approx. 0.45 kg; fits standard rear full‑height slot dimension
• Environmental Ratings: Operating temperature −30 °C ~ +65 °C; storage temperature −40 °C ~ +85 °C; relative humidity 5‑95 % non‑condensing; vibration and shock performance complies with API‑670 machinery‑protection standards
• Electrical Characteristics: Powered entirely via rack backplane 5 VDC supply; no local CPU or temperature‑calculation chip. All cold‑junction compensation, RTD linearization, thermocouple conversion, alarm‑threshold judgment and sensor‑fault diagnosis are fully executed on the 3500‑65 front‑end module. This rear card purely completes hardware‑level signal routing between rack‑internal backplane bus and field temperature‑sensor loops. It does not participate in machinery protection‑trip decision‑making logic.
• Input Signal Support: 3‑wire /4‑wire RTD; multiple‑type isolated‑tip thermocouple; mixed‑type channel configuration allowed via front‑module software setting.

Core Functions

1. Acts as physical field‑wiring interface for 3500‑65 16‑channel temperature monitor. Receives raw resistance‑based signals from RTD and millivolt signals from isolated‑tip thermocouples, transmits sensor signals to front‑end monitor module through backplane bus for temperature conversion and alarm comparison.
2. Supports mixed‑sensor access for 16 independent channels. Each channel can be individually configured as RTD or thermocouple input via 3500 rack configuration software, realizing bearing metal temperature, stator winding temperature and process fluid temperature monitoring for rotating‑machinery equipment.
3. All sensor‑type selection, temperature‑range definition, cold‑junction compensation parameter setting and alarm‑threshold assignment are finished in 3500 configuration software on front‑end 3500‑65 module; this rear I/O hardware does not participate in signal calculation or alarm‑judgment logic. Front‑module LED indicators reflect channel fault and alarm status for on‑site maintenance inspection.
4. No local decision‑making or diagnostic logic. Sensor open‑circuit, short‑circuit and signal‑out‑of‑range faults are diagnosed by 3500‑65 front‑end monitor module. Fault status information will be uploaded to 3500 system event log for operator troubleshooting review. This temperature‑monitor module belongs to protection‑relevant measuring path; under TMR triple‑modular‑redundant scheme, three sets of 3500‑65 front‑rear assemblies shall be deployed in adjacent rack slots.
5. Widely deployed in steam‑turbine, gas‑turbine and centrifugal‑compressor TSI machinery‑protection systems for power and petrochemical plants. Distinguished from variant 172109‑01: 172103‑01 uses internal rear‑card terminals; 172109‑01 is designed for external termination block 172115‑01; two variants cannot cross‑replace without firmware matching of front‑end 3500‑65 module.

Installation Requirements

1. Strict one‑to‑one slot‑pairing requirement: this rear small card must be inserted in rear slot directly behind 3500‑65 front‑end temperature‑monitor module. Mismatched front‑rear part numbers or wrong slot positions will cause partial or total loss of 16‑channel temperature input capability.
2. Power‑off operation rule for rear‑card replacement: although most front‑end monitor modules support hot‑swap function, insertion / extraction of this rear‑side temperature‑input small‑card must be performed with the entire 3500 rack powered down. Live‑swap of rear card may generate backplane bus transient noise, trigger random sensor‑fault diagnosis and false‑alarm output.
3. Field‑wiring specification enforcement: use shielded twisted‑pair instrument cables for RTD and thermocouple sensor wiring. Thermocouple loops shall apply matched compensating cable strictly. Signal cables shall be physically separated from high‑voltage power cables and large‑current motor cables to suppress electromagnetic interference, avoiding temperature‑value drift and random sensor‑fault alarms. Apply proper torque for plug‑in terminal‑block screws; loose connections will generate unstable reading.
4. Cabinet environmental control: maintain sufficient cabinet forced‑air ventilation and temperature control. Prevent oil mist, corrosive gas, conductive dust and moisture condensation inside cabinet space. Contamination accumulation on PCB traces and backplane connector pins will produce high‑resistance contact points and degrade long‑term temperature‑reading stability.
5. Pre‑installation visual inspection: carefully inspect backplane edge‑connector pins and plug‑in terminal blocks before inserting small card. Check for bent pins, mechanical damage, corrosion and foreign‑object debris. Damaged contacts will result in partial‑channel temperature drift and sporadic hard‑to‑reproduce measuring‑point faults.
6. Part‑number cross‑version distinction: 172103‑01 is internal‑termination rear I/O small‑card for 3500‑65; 172109‑01 is external‑termination variant matched with 172115‑01 terminal block. These variants are not interchangeable on‑site; mixing‑up will cause sensor‑signal acquisition failure and requires front‑module firmware revision verification before replacement.

Common Failure Modes

‑ Plug‑in terminal‑block oxidation or crimp degradation: intermittent temperature‑value drift, random host‑side sensor open‑circuit / short‑circuit diagnostic alarms. ‑ Backplane edge‑connector pin mechanical damage, bent or corroded contacts: partial‑channel or total loss of temperature‑signal acquisition, measuring‑point reading freeze. ‑ Conformal‑coating scratch, PCB trace corrosion induced by oil mist or chemical vapor: individual signal‑trace open‑circuit or short‑circuit inside PCB substrate, permanent failure of partial temperature‑input channels. ‑ ESD electrical overstress damage during field‑handling: internal PCB signal‑trace micro‑fracture without obvious exterior physical damage; manifests as unstable temperature‑reading performance under cabinet internal thermal‑temperature cycling. ‑ Mechanical damage caused by improper insertion force: edge‑connector pin offset, internal fine‑trace cracking; temperature‑channel intermittent‑failure occurs under cabinet‑base vibration operating conditions.