9 Maintenance
56 S4 D184B122U02
Replacing the Instrument Fuses:
Replace the fuses as follows:
1. Turn off the supply power and wait 40 minutes
2. Unscrew the large cover
3. Remove the protection cap F101
4. Replace the defective fuse (4.0 A slo-blow) Replacement part No. D151B002U07
5. Reinstall protection cap F101
6. Press the large cover against the gaskets on the open side and tighten the cover screws
7. Turn on the supply power
STOP
Warning!
When the housing cover is open EMC and personnel contact protection are no longer provided and the
voltages on accessible components may be hazardous. Electrocution danger!
Information!
Use only original ABB replacement parts!
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