Safety And Conformity; Safety Precautions - GE AF-650 GP Design Manual

2 Safety and Conformity

2.1 Safety Precautions

2.1.1 Safety Precautions
The voltage of the drive is dangerous whenever connected to mains. Incorrect installation of the motor, drive or network may cause damage
to the equipment, serious personal injury or death. Consequently, the instructions in this manual, as well as national and local rules and safety
regulations, must be complied with.
Safety Regulations
1. The mains supply to the drive must be disconnected whenever repair work is to be carried out. Check that the mains supply has been disconnected and
that the necessary time has elapsed before removing motor and mains supply plugs.
2. The [OFF] button on the Keypad of the driver does not disconnect the mains supply and consequently it must not be used as a safety switch.
3. The equipment must be properly earthed, the user must be protected against supply voltage and the motor must be protected against overload in
accordance with applicable national and local regulations.
4. The earth leakage current exceeds 3.5 mA.
5. Protection against motor overload is not included in the factory setting. If this function is desired, set par. F-10 Electronic Overload to data value Elec.
OL trip 1 [4] or data value Elec. OL warning 1 [3].
6. Do not remove the plugs for the motor and mains supply while the drive is connected to mains. Check that the mains supply has been disconnected
and that the necessary time has elapsed before removing motor and mains plugs.
7. Please note that the drive has more voltage sources than L1, L2 and L3, when load sharing (linking of DC intermediate circuit) or external 24 V DC are
installed. Check that all voltage sources have been disconnected and that the necessary time has elapsed before commencing repair work.
Warning against unintended start
1. The motor can be brought to a stop by means of digital commands, bus commands, references or a local stop, while the drive is connected to mains. If
personal safety considerations (e.g. risk of personal injury caused by contact with moving machine parts following an unintentional start) make it
necessary to ensure that no unintended start occurs, these stop functions are not sufficient. In such cases the mains supply must be disconnected.
2. The motor may start while setting the parameters. If this means that personal safety may be compromised (e.g. personal injury caused by contact with
moving machine parts), motor starting must be prevented by disconnection of the motor connection.
3. A motor that has been stopped with the mains supply connected, may start if faults occur in the electronics of the drive, through temporary overload
or if a fault in the power supply grid or motor connection is remedied. If unintended start must be prevented for personal safety reasons (e.g. risk of
injury caused by contact with moving machine parts), the normal stop functions of the drive are not sufficient. In such cases the mains supply must be
disconnected.
4. Control signals from, or internally within, the drive may in rare cases be activated in error, be delayed or fail to occur entirely. When used in situations
where safety is critical, e.g. when controlling the electromagnetic brake function of a hoist application, these control signals must not be relied on
exclusively.
Touching the electrical parts may be fatal - even after the equipment has been disconnected from mains.
Also make sure that other voltage inputs have been disconnected, such as external 24 V DC, load sharing (linkage of DC intermediate circuit), as well as the motor
connection for kinetic back up.
Systems where frequency converters are installed must, if necessary, be equipped with additional monitoring and protective devices according to the valid safety
regulations, e.g law on mechanical tools, regulations for the prevention of accidents etc. Modifications on the frequency converters by means of the operating
software are allowed.
Protection Mode
Once a hardware limit on motor current or dc-link voltage is exceeded the drive will enter "Protection mode". "Protection mode" means a change of the PWM
modulation strategy and a low switching frequency to minimize losses. This continues 10 sec after the last fault and increases the reliability and the robustness
of the drive while re-establishing full control of the motor.
AF-650 GP Design Guide
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