2.4 Protective Measures
• Safety engineering systems may only be installed and commissioned by qualified and skilled personnel.
• Install the drive in an IP54 cabinet as per IEC 60529 or in equivalent environment. In special applications, a higher IP degree may be
necessary.
• Ensure short-circuit protection of the cable between the safety option and the external safety device according to ISO 13849-2
table D.5. When external forces influence the motor axis (for example, suspended loads) extra measures (for example, a holding
safety brake) are required to eliminate hazards.
2.5 Safety Precautions
W A R N I N G
HIGH VOLTAGE
AC drives contain high voltage when connected to AC mains input, DC supply, or load sharing. Failure to perform installation,
start-up, and maintenance by qualified personnel can result in death or serious injury.
-
Only qualified personnel must perform installation, start-up, and maintenance.
W A R N I N G
UNINTENDED START
When the drive is connected to the AC mains, DC supply, or load sharing, the motor may start at any time, causing risk of death,
serious injury, and equipment or property damage. The motor may start by activation of an external switch, a fieldbus
command, an input reference signal from the LCP or LOP, via remote operation using MCT 10 Set-up software, or after a cleared
fault condition.
-
Press [Off] on the LCP before programming parameters.
-
Disconnect the drive from the mains whenever personal safety considerations make it necessary to avoid unintended
motor start.
-
Check that the drive, motor, and any driven equipment are in operational readiness.
W A R N I N G
DISCHARGE TIME
The drive contains DC-link capacitors, which can remain charged even when the drive is not powered. High voltage can be
present even when the warning indicator lights are off.
Failure to wait the specified time after power has been removed before performing service or repair work could result in death
or serious injury.
-
Stop the motor.
-
Disconnect AC mains, permanent magnet type motors, and remote DC-link supplies, including battery back-ups, UPS, and
DC-link connections to other drives.
-
Wait for the capacitors to discharge fully. The minimum waiting time is specified in the table Discharge time and is also
visible on the nameplate on top of the drive.
-
Before performing any service or repair work, use an appropriate voltage measuring device to make sure that the capacitors
are fully discharged.
Safety
Installation Guide | VLT®Safety Option MCB 152
AN327351953089en-000101 / 130R0578| 11
Danfoss A/S © 2020.02
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