Synchronous motors (PMSM) – Manual with installation instructions
12
B 5000 en-2621
1.7 Hazards
1.7.1 Hazards due to electric shock
An electric shock when touching live components may lead to severe injuries or death.
• Before switching on the voltage supply, ensure that all associated covers are closed and all
associated protective devices are installed and functional.
• Even if the drive has been disconnected from the supply voltage, live components and power
connections must not be touched immediately, because of possible charged capacitors. Observe
the applicable information signs located on the drive. With the motor disconnected from the power
supply, the drive can still rotate and possibly generate hazardous voltage.
• Installation of the drive and any work on the drive may only be carried out by qualified personnel
(qualified electricians) in strict compliance with the instructions provided in this manual.
• Before starting any work on the drive, stop the motor and disconnect it from the voltage supply by
disconnecting all poles. A motor standstill is not identical to electrical isolation from the mains.
When the motor is at a standstill, e.g. due to the electronic block of a connected frequency inverter
or a jammed drive unit, the connection terminals and supply cables may carry dangerous voltage.
• In addition to the main power circuits, also take any additional or auxiliary circuits into account.
• Prior to any work on the drive, observe the 5 safety rules:
1. Disconnect
2. Secure against switching on
3. Check for no voltage
4. Earth and short circuit
5. Cover or cordon off adjacent live components
Do not reverse these measures until the work on the drive has been completed.
1.7.2 Hazards due to rotating parts
Rotating parts cause a risk of entanglement. This may lead to severe injuries such as crushing or
strangling.
• Provide contact protection. In addition to shafts, this also applies to driven elements such as belt
drives, chain drives, shrink discs and couplings. Take possible run-on of the machine into
consideration for the design of protective devices.
• Do not operate the drive without covers or hoods.
• Secure the drive to prevent accidental activation during installation and maintenance work.
• For test operation do not switch on the drive without an installed driven element or secure the
motor shaft key.
• Also observe the safety information in the operating and installation instructions provided by
manufacturers of components supplied.
