469 Motor Management Relay Overview

The 469 Motor Management Relay is a microprocessor-based relay designed to offer protection and management for medium to large horsepower motors and their driven equipment. It integrates various functions such as motor protection, fault diagnostics, power metering, and RTU (Remote Terminal Unit) functionalities in one cost-effective drawout package. The relay comes equipped with six output relays that can be used for trips, alarms, and start blocks, providing comprehensive protection and control.

The functionality of the 469 Relay is illustrated using ANSI device numbers as shown in the single-line diagram below.

Specifications

Power Supply

• Options: Low (LO) / High (HI) – must be specified when ordering
• Range:
  • LO:
    • DC: 20 to 60 V DC
    • AC: 20 to 48 V AC at 48 to 62 Hz
  • HI:
    • DC: 90 to 300 V DC
    • AC: 70 to 265 V AC at 48 to 62 Hz
• Power Consumption: 45 VA (max), 25 VA (typical)
• Operation Time Without Supply Voltage: 30 ms

Phase Current Inputs

• CT Primary: 1 to 5000 A
• CT Secondary: 1 A or 5 A (to be specified with order)
• Burden: Less than 0.2 VA at rated load
• Conversion Range: 0.05 to 20 × CT
• Accuracy:
  • < 2 × CT: ± 0.5% of 2 × CT
  • ≥ 2 × CT: ± 1% of 20 × CT
• CT Withstand:
  • 1 second @ 80 × rated current
  • 2 seconds @ 40 × rated current
  • Continuous @ 3 × rated current

Ground Current Inputs

• CT Primary: 1 to 5000 A
• CT Secondary: 1 A or 5 A (setpoint)
• Burden:
  • < 0.2 VA at rated load (for 1 A or 5 A)
  • < 0.25 VA for 50:0.025 @ 25 A
• Conversion Range: 0.02 to 1 × CT Primary Amps
• Accuracy:
  • ± 0.5% of 1 × CT for 5 A
  • ± 0.5% of 5 × CT for 1 A
  • ± 0.125 A for 50:0.025
• CT Withstand:
  • 1 second @ 80 × rated current
  • 2 seconds @ 40 × rated current
  • Continuous @ 3 × rated current

Differential Phase Current Inputs

• CT Primary: 1 to 5000 A
• CT Secondary: 1 A or 5 A (setpoint)
• Burden: Less than 0.2 VA at rated load
• Conversion Range: 0.02 to 1 × CT
• Accuracy:
  • ± 0.5% of 1 × CT for 5 A
  • ± 0.5% of 5 × CT for 1 A
• CT Withstand:
  • 1 second @ 80 × rated current
  • 2 seconds @ 40 × rated current
  • Continuous @ 3 × rated current

Voltage Inputs

• VT Ratio: 1.00 to 150.00:1 (in steps of 0.01)
• VT Secondary: 273 V AC (full scale)
• Conversion Range: 0.05 to 1.00 × full scale
• Accuracy: ± 0.5% of full scale
• Max. Continuous Voltage: 280 V AC
• Burden: > 500 kΩ

Digital Inputs

• Inputs: 9 opto-isolated inputs
• External Switch: Dry contact < 800 Ω, or open collector NPN transistor from sensor
  • 6 mA sinking from internal 4 kΩ pull-up at 24 V DC with Vce < 4 V DC
• Sensor Supply: +24 V DC at 20 mA max.

RTD Inputs

• Types Supported:
  • 100 Ω Platinum (DIN.43760)
  • 100 Ω Nickel
  • 120 Ω Nickel
  • 10 Ω Copper
• RTD Sensing Current: 5 mA
• Isolation: 36 Vpk (isolated with analog inputs and outputs)
• Range: -50 to +250°C
• Accuracy: ±2°C
• Lead Resistance:
  • 25 Ω max per lead for Pt and Ni types
  • 3 Ω max per lead for Cu type
• No Sensor Detection: > 1000 Ω
• Short/Low Alarm: < –50°C

Trip Coil Supervision

• Applicable Voltage: 20 to 300 V DC / V AC
• Trickle Current: 2 to 5 mA

Analog Current Inputs

• Input Types: 0 to 1 mA, 0 to 20 mA, or 4 to 20 mA (setpoint)
• Input Impedance: 226 Ω ±10%
• Conversion Range: 0 to 21 mA
• Accuracy: ±1% of full scale
• Analog Input Supply: +24 V DC at 100 mA max.
• Response Time: ≤ 100 ms

Communication Ports

• RS232 Port: 1, front panel, non-isolated
• RS485 Ports: 2, isolated together @ 36 Vpk
• Baud Rates:
  • RS485: 300, 1200, 2400, 4800, 9600, 19200
  • RS232: 9600
• Parity: None, Odd, Even
• Protocol: Modbus® RTU / half duplex