Technical Specifications

Series: 7200 Series Monitoring Module (72201 is a universal monitoring card)

Channels: Dual-channel independent input, suitable for electrical eddy current probes

Measurement types: Shaft vibration (peak-to-peak), axial displacement, eccentricity, phase difference

Input signals: Compatible with 3300 XL series eddy current preamplifiers (-24V power supply, 3-wire shielded)

Power supply: Rack backplane power supply -17.5 ~ –26 VDC

Output:

4–20 mA analog (can upload to DCS/PLC)

Relay alarm output (two-level alarm: Alert / Danger)

Accuracy: ±0.1% FS, frequency response 10 Hz ~ 10 kHz

Operating temperature: 0 ℃ ~ 60 ℃; Storage: –40 ℃ ~ 85 ℃

Structure: Standard full-height card, 7200 series rack installation

Installation and Wiring

Installation: Module vertically inserted into any slot of the 7200 rack, lock the handle, ensure reliable contact of the backplane bus.

Sensor side:

Preamplifier 3-wire: Vt(–24V), COM, OUT corresponding to the module channel terminals

Single-ended grounding of the shield layer (rack ground), prohibit double-ended grounding

Output side:

4–20 mA: Connect to DCS/PLC AI card (note polarity)

Alarm relay: Dry contact connected to the interlock circuit (passive)

Cabling: Signal cable and power cable separated in the cable tray, distance ≥30 cm, avoid interference from frequency converters and motors.

Before power-on: Check the model, jumpers / addresses, terminal tightening, no short circuit; then power on and configure.

Maintenance and Care

Daily inspection: Observe the LED on the panel (power OK, channel normal, alarm / danger), confirm stable values and no abnormal jumps.

Regularly (3–6 months):

Tighten all wiring terminals, check the cable for no damage, aging, or oil contamination

Clean the dust on the module surface (use a soft brush / compressed air after power off)

Calibration (annually / major overhaul):

Use TK-3E calibration instrument to calibrate the probe – preamplifier – module overall linearity and alarm points

Save calibration records, if exceeded the limit, adjust or replace the probe / preamplifier

Storage: Spare modules placed in a dry, cool, vibration-free environment, stored in an anti-static bag Fault diagnosis

Channel has no reading / dead value

Check if the rack power supply is normal (–17.5 ~ –26 VDC)

Check if the preamplifier power supply and probe gap are within the linear range (usually 0.5–1.5 mm)

Loose terminals, core wire – shield short circuit, backplane contact failure

Large value fluctuations, jumps, drift

Oxidation of connectors / oil contamination → Clean and re-connector; poor shield grounding → Single-ended grounding

Strong interference nearby (frequency converter, large motor) → Move away or add shielding / filtering

Loose probe installation, excessive shaft movement → Tighten the probe and re-check the mechanical gap

False alarm / non-alarm

Incorrect alarm threshold setting → Reconfigure and confirm Alert/Danger values

Oxidation / adhesion of relay contacts → Test for continuity, replace card if necessary

High signal noise → Optimize grounding, check probe / preamplifier performance

Communication / analog quantity anomaly

No output of 4–20 mA: Check wiring polarity, module configuration, load resistance

Communication failure with upper computer: Check address, baud rate, bus connection, whether to restart the rack