SMA SUNNY CENTRAL Maintenance manual - Manual (Page 48)

Checking protective devices SMA Solar Technology AG
48 SCWAR-WEN094020 Maintenance Manual
Motor-driven DC circuit breaker (direct drive)
Procedure for checking the DC circuit breaker
1. Switch the Sunny Central to "Stop" and open the doors.
2. Ensure that the Sunny Central is connected to a control voltage (supply voltage) and is supplied
with power.
3. Tape door contact switch to the "On" position.
4. Switch the Sunny Central to "Start".
☑ The DC switch is switched on and shifts to "On" position.
5. Switch the Sunny Central to "Stop".
☑ The DC switch trips and shifts to "Off" position.
6. Release door contact switches (remove the adhesive tape).
7. Close the cabinet doors.
6.4 Checking the fuses and disconnectors
1. Visually check the existing fuses and tension springs on the fuse holders.
2. Check all power cable connections for looseness and tighten them if necessary. Check the
connectors and insulation for discoloration or degradation. Replace any damaged connectors
or corroded contacts.
3. Check all string cable connections for looseness and tighten them if necessary. Check the
insulation, and the terminals on the assembly as well on the busbar for discoloration or
degradation.
4. If necessary, lubricate the contacts.
☑ The check of the fuses and disconnectors is completed.
This switch has a switch-on device (A), a position display
(B), an off-key (C) and a slider (D) for setting the
automatic / manual operation. It is used in the following
Sunny Central devices:
• SC100 indoor
• SC100 outdoor
DANGER!
Death resulting from electric shock and burning upon touching the medium-
voltage grid's live components.
• Only work on the device when it is switched off and voltage-free.