Description
Technical background & performance features
Compact standalone amplifier unit, part number PFEA111‑20.
Designed to work with strain‑gauge‑based tension load cells.
Carries out signal amplification, filtering and temperature compensation for load‑cell raw mV signal.
Output standard 4‑20mA analog signal for connecting to DCS / PLC input channels.
Supports calibration, gain adjustment and fault diagnosis function via front‑panel operation.
Power supply requirement: 24 VDC external power input.
LED status lamps reflect power state, measuring loop fault and alarm events.
Install inside industrial control cabinet, non‑condensing environment required.
Spare parts shall be kept dry, avoid mechanical impact and static‑electric damage.
Cannot operate without matched tension load cell. Parameter recalibration is necessary after hardware replacement.
Typical application scenarios
Extensively used in pulp‑and‑paper production lines, plastic film processing, textile machinery and metal strip rolling equipment.
It processes tension sensor signals, delivers stable tension measurement value to controller, supporting constant‑tension winding‑unwinding control.
On‑site installation points to note
Cut off 24VDC power supply before installing or replacing this amplifier.
Follow anti‑static requirements during hardware handling.
Mount unit on standard DIN rail inside cabinet.
Keep load‑cell weak‑signal cables separated from high‑power motor cables to prevent interference.
Complete wiring strictly following device wiring diagram.
Carry out zero‑point and span calibration after installation.
Power on and verify output 4‑20mA signal corresponding to actual tension value.
Maintain cabinet ventilation; continuous high ambient temperature will affect measurement precision.
Common on‑site phenomena and analysis ideas
All status indicators do not light up: Check external 24VDC power supply and terminal wiring tightness.
Output fixed zero value or full‑scale value: Inspect load‑cell integrity, sensor cable open‑circuit / short‑circuit and connection terminals.
Measured tension value drifts or jitters: Check grounding condition, cable interference, or need to redo zero‑span calibration.
Amplifier reports sensor loop fault: Confirm load‑cell resistance parameters and cable integrity.
After surge damage caused by site fault: Replace PFEA111‑20 amplifier, meanwhile inspect matched tension load cell for secondary damage.
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