Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
3. Product Introduction (Anti-Template)
When a critical compressor or mill motor trips unexpectedly, every minute of downtime carries a measurable cost. The 469-P5-LO-A20-E sits at the center of that protection scheme, continuously calculating thermal capacity used while watching for unbalance, ground faults, and overtorque conditions.
Fitted with an enhanced display and four assignable 4–20 mA outputs, it feeds real-time data to the plant DCS without requiring extra transducers. The low-voltage control-power option matches many existing 24 V or 48 V station batteries, simplifying retrofit work on older medium-voltage starters.
469-P5-LO-A20-E
469-P5-LO-A20-E
469-P5-LO-A20-E
469-P5-LO-A20-E
469-P5-LO-A20-E
4. Key Technical Specifications
| Parameter | Value |
|---|---|
| Phase CT Secondary | 5 A (must be ordered as P5) |
| Control Power (LO) | 20–60 VDC or 20–48 VAC @ 48–62 Hz |
| Analog Outputs | Four active 4–20 mA channels |
| RTD Inputs | 12 × 3-wire (100 Ω Pt, 100/120 Ω Ni, 10 Ω Cu) |
| Digital Inputs | 9 opto-isolated |
| Output Relays | 6 Form-C electromechanical |
| Communications | 1 × RS232 (front), 2 × RS485 (rear) |
| Case Style | Fully draw-out with automatic CT shorting |
| Power Consumption | 45 VA max / 25 VA typical |
| Operating Temperature | –40 °C to +60 °C |
| Display | Enhanced alphanumeric LCD |
5. Field Application & Technical Pitfalls (The Engineer’s Guide)
This relay commonly protects large induced-draft fans in power plants, high-inertia compressors in process gas service, and dual-speed mill motors in mining operations. In each case the thermal model plus RTD bias keeps the motor within its insulation class while still allowing full-load starts.
Three pitfalls appear repeatedly during replacement:
Firmware or setpoint mismatch – loading a file from a different revision can silently disable RTD biasing or change the overload curve family.
CT polarity or ratio error – the differential inputs are field-programmable for 1 A or 5 A, but the phase inputs are hard-wired at order; mixing them produces false residual current.
Control-power range violation – applying 125 VDC to an LO unit damages the power supply within seconds.
One plant learned the hard way when a new 469 was installed with the old unit’s settings file. The RTD bias remained disabled; three months later a bearing failure went undetected until the motor locked and the thermal capacity had already reached 100 %. A ten-minute verification of the actual RTD assignments would have prevented the outage.
6. Quality Control (QC) SOP & Transparency
- Inbound Verification – OEM carton and serial number are photographed; anti-counterfeit holograms and date codes are cross-checked against the packing list.
- Live Rig Testing – unit is powered on a calibrated LO supply, performs self-test, establishes RS485 Modbus handshake, and cycles all six output relays under load.
- Parameter Testing – insulation resistance is measured on CT and VT circuits; analog-output linearity is verified at 4 mA, 12 mA, and 20 mA; RTD channels are checked with precision resistors.
- Final QA & Packaging – unit is sealed in an anti-static bag with desiccant, fitted with a QC-passed label showing test date and technician ID, then double-boxed for shipment.
7. Frequently Asked Questions (FAQ)
Can the 469-P5-LO-A20-E be hot-swapped?
No. Although the draw-out case shorts the CTs automatically, control power and digital I/O must be isolated first. Live removal risks contact arcing and loss of residual protection during the transfer.
Is this unit a direct drop-in for an older 469 without the “E” suffix?
Mechanically yes. Electrically the enhanced display changes nothing in the terminal assignments, but confirm the firmware revision supports the same setpoint map before loading settings.
What warranty comes with a new-surplus unit?
Twelve months from shipment against defects in materials and workmanship, provided the unit is installed within its published ratings.
How do I confirm the analog outputs are truly 4–20 mA?
The order code ends in A20. On power-up the relay reports the output range in the status menu; a quick loop check with a milliamp meter settles any remaining doubt.
Does the LO power supply accept both AC and DC?
Yes—20–60 VDC or 20–48 VAC at 48–62 Hz. Verify the actual station voltage before energizing; an HI unit will not tolerate the lower range and an LO unit will not survive the higher range.
What are the clearest signs of a genuine OEM unit versus a refurbished board?
Original conformal coating pattern, factory laser-etched serial number on the draw-out chassis, and matching date codes on the main processor and power-supply boards. Refurbished units often show reworked solder joints or non-OEM labels covering the original markings.
