SRVO-220: SDI fuse blown
FUSE1 on the main board - protecting the +24V output for the peripheral device interface - has blown.
What it means
FUSE1 on the main board - protecting the +24V output for the peripheral device interface - has blown. Prime suspect: a short between 24SDI and 0V somewhere in the peripheral cabling.
Common causes
Ranked by what technicians most often find, most likely first.
- Peripheral device cable shorting 24SDI to 0V.
- Fault downstream of connector CRS40.
- Main board, E-stop-to-amplifier cable, main-board-to-E-stop cable, E-stop unit, or amplifier.
How to fix it
- With the controller de-energized and locked out, inspect the peripheral device cable for shorts and replace it if suspect.
- With the controller de-energized and locked out, disconnect CRS40. Restore power and check whether the fuse still blows. This is a clean isolation test for the downstream wiring.
- If it blows with CRS40 disconnected, take an image backup with the controller powered, then de-energize and apply lockout/tagout again before replacing the main board.
- Then work the cable and unit ladder with the controller de-energized and locked out for each exchange: E-stop-to-amplifier cable, main-to-E-stop cable, E-stop unit, then amplifier.