SMA MEDIUM VOLTAGE POWER STATION 500SC-JP System Manual page 16

2 Safety
Danger to life from electric shock even if the inverter is disconnected on the AC and DC sides
The precharge unit of the order option "Q at Night" will carry live voltage even if the AC contactor and the DC
switchgear are open. Touching live components results in death or serious injury due to electric shock.
• Do not touch any live components.
• Switch off the inverter.
• After switching off the inverter, wait at least 15 minutes before opening it to allow the capacitors to discharge
completely.
• Ensure that no voltage is present.
• Do not remove protective covers.
• Observe the warning messages.
• Wear suitable personal protective equipment for all work on the product.
Danger to life from electric shock from improperly operating the tap changer of the MV transformer.
Operating the tap changer of the MV transformer while energized will create a short circuit in the MV transformer.
The resulting voltages will lead to death or serious injury.
• Only operate the tap changer when the MV transformer is dead.
• Ensure the MV transformer is dead before performing any work or making any adjustments.
• All work and adjustments on the MV transformer must be performed by a duly authorized person.
• Wear suitable protective equipment for all work.
Danger to life from electric shock if the product is not locked
If the product is not locked, unauthorized persons will have access to live components carrying lethal voltages.
Touching live components can result in death or serious injury due to electric shock.
• Always close and lock the product.
• Remove the keys.
• Store the keys in a safe place.
• Ensure that no unauthorized persons have access to the closed electrical operating area.
Risk of fire due to failure to observe torque specifications on live bolted connections
Failure to follow the specified torques reduces the ampacity of live bolted connections so that the contact resistances
increase. This can cause components to overheat and catch fire.
• Ensure that live bolted connections are always tightened with the exact torque specified in this document.
• When working on the device, use suitable tools only.
• Avoid repeated tightening of live bolted connections as this may result in inadmissibly high torques.
16 MVPS22JP-SH-en-11
SMA Solar Technology AG
System Manual