ABB SACO 16D3 16-Channel Digital Annunciator Unit

• Manufacturer: ABB
• Series: SPACOM / SACO
• Functional Description: 16-Channel Digital Annunciator Unit
• Input Channels: 16 channels, activated by normally open (NO) or normally closed (NC) contacts
• Output Relays: 4 main relays + 16 additional relays (for field contact follower or group re-alarm)
• Display: Four-digit alphanumeric display for first-out alarm indication
• Communication: Serial interface and SPA bus (via SPA-ZC 17/S or SPA-ZC 21/S modules)
• Power Supply Options: SPGU 240A1 (80-265 V AC/DC) or SPGU 48B2 (18-80 V DC)
• Self-Monitoring: Advanced hardware and software self-supervision system

ABB SACO 16D3

• SACO 16D1: A similar 16-channel digital annunciator with 4 output relays (without the additional 16 relay module).
• SACO 16A3: An analog annunciator unit for monitoring analog quantities like temperature, current, or voltage.

1. Visual & Physical Inspection: Verification of part numbers, aluminum housing integrity, and connector/module seating.
2. Functional Bench Testing: Simulating NO/NC contact closures to validate channel activation, LED indicators, and first-out display logic.
3. Relay & Communication Test: Verifying the operation of all 20 output relays and stable data exchange over the SPA bus or serial interface.
4. Self-Monitoring Validation: Confirming the self-supervision system correctly detects faults and triggers the designated output relay.
5. Final Certification: Issuance of a certificate of conformity confirming the unit is fully operational and meets original manufacturer specifications.

• Primary Applications: Centralized alarm panels in power generation, substations, and industrial process plants where monitoring multiple discrete on/off signals is required.
• Key Features:
  • First-Out Indication: Clearly identifies the initial alarm in a sequence of events, which is critical for fault diagnosis.
  • Event Register: Stores the last nine events with time stamps for subsequent analysis.
  • Modular Design: Comprises separate alarm, I/O, connection, output relay, and power modules for easy maintenance and customization.
  • High Reliability: Advanced self-monitoring ensures maximum availability even in harsh environments.

• Q: What is the primary function of the SACO 16D3?
  A: It acts as a centralized alarm monitoring unit, providing visual and audible alerts for up to 16 discrete digital signals and identifying the first-out alarm.
• Q: How does the first-out alarm indication work?
  A: When an alarm is triggered, the four-digit display shows an ‘A’ followed by the channel number of the first alarm in the sequence, helping operators quickly identify the root cause.
• Q: Can this unit be integrated into a larger network?
  A: Yes, it can be connected via a fibre-optic SPA bus to form a complete supervision and data acquisition system with other units.
• Q: What is the difference between SACO 16D3 and SACO 16D1?
  A: The SACO 16D3 includes an additional module with 16 extra output relays, providing a total of 20 relays, whereas the 16D1 has only the 4 main output relays.