SMA SC 500CP-US - Manual (Page 84)

13 Installing the DC Fuses SMA America, LLC
84 SCCP-US-IA-US_en-41 Installation Manual
13 Installing the DC Fuses
13.1 Units without Integrated DC Switch
Each fuse shall be rated 450 A
DC
maximum, 1,000 V
DC
. For continued protection against risk of fire, replace only with
same type and ratings of fuse.
The maximum number of DC fuses is nine.
Additionally required mounting material (not included in the scope of delivery):
☐ Clean cloth
☐ Ethanol cleaning agent
Procedure:
1. Clean the contact surfaces of the copper bus bars and the DC fuses using a clean cloth and ethanol cleaning agent.
2. Clean the contact surfaces with the non-woven abrasive until they have a light metallic sheen. At the same time,
ensure that the coated contact surfaces are not damaged.
3. Remove metal dust using a clean cloth and ethanol cleaning agent and do not touch the contact surfaces after
cleaning.
4. Insert the fuse of type 20 034 28.XXX from SIBA in accordance with the circuit diagram and mount it with a torque
of 38.5 ft.-lbs. (52 Nm). Only use the pre-installed screws.
5. Attach the label with the corresponding nominal current of the fuse directly next to the fuse on the copper bus bar.
6. Attach the label with the corresponding nominal current of the fuse to the relevant page of the circuit diagram.
13.2 Units with Integrated DC Switch
Each fuse shall be rated 400 A
DC
maximum, 1000 V
DC
. For continued protection against risk of fire, replace only with
same type and ratings of fuse.
The maximum number of DC fuses is 9.
Additionally required material (not included in the scope of delivery):
☐ Tool for inserting the DC fuses
– SMA part number 61--1590
– SIBA part number 22 031 01
'$1*(5
Danger to life from electric shock due to live voltage
Despite disconnecting the integrated DC Switch, voltages are still present in the DC fuses and the inverter busbars.
Touching the DC fuses or the busbars will result in death or very serious injuries from electric shock (see Section 14
"Disconnecting the Inverter", page 86).
• Disconnect the DC voltage in the main distribution or the sub-distribution.
• Wait 15 minutes until the inverter capacitors have discharged completely.
Maximum short-circuit current
• Observe the maximum short-circuit current of 2,596 A
DC
when selecting the DC fuses.
Maximum short-circuit current
• Observe the maximum short-circuit current of 2,596 A
DC
when selecting the DC fuses.