ABB DO821 3BSE013250R1 Digital Output Relay

Overview

The DO821 is a high-performance 8-channel digital output module designed for S800 I/O systems. It features normally closed (NC) relay outputs for both AC and DC applications, supporting voltage ranges from 5V to 250V. The module offers enhanced safety and reliability with isolated output channels, optical isolation barriers, and comprehensive protection features.

Technical Specifications

• Number of Channels: 8
• Type of Output: Relay (Normally Closed)
• Voltage Range: 5-250 V AC/DC
• Load Current (Maximum): 3 A
• Load Current (Minimum): 5 mA
• Maximum Make Current: 30 A for 200 ms (L/R > 10 ms)
• Maximum Break Power:
  • AC: 720 VA (Power Factor > 0.4)
  • DC: 40 W (L/R < 40 ms)
• Pick-Up Time (Maximum): 9 ms
• Release Time (Maximum): 5 ms
• Number of Operations per Hour (Maximum): 2000
• Lifetime Operations:
  • Mechanical: >20 million
  • Electrical: >1 million
• Current Consumption:
  • 5 V (Modulebus): 60 mA
  • 24 V (Modulebus): 140 mA
• Power Dissipation: 2.9 W
• Isolation: Individually isolated from ground (Rated Isolation Voltage: 250 V)
• Module Termination Units: TU811, TU813, TU831, TU836, TU837, TU851
• MTU Keying Code: CA
• Rated Insulation Voltage: 250 V
• Dielectric Test Voltage: 2000 V AC

FAQ

1. What is the purpose of the Warning LED on the DO821?
   The Warning LED illuminates when the relay power supply voltage is missing, indicating a fault. The system then triggers an error signal, which can be read through the ModuleBus.
2. Can the relay power supervision be disabled?
   Yes, relay power supervision can be enabled or disabled through a parameter setting.
3. What is the maximum field cable length for the outputs?
   The maximum field cable length is 600 meters (656 yards) for both AC and DC.
4. What is the expected lifetime of the DO821 module?
   The DO821 module supports over 20 million mechanical operations and over 1 million electrical operations, ensuring long-term reliability in harsh environments.

For more detailed information, please check official datasheet: S800_I_O_Modules_and_Termination_Units