Danfoss VLT FC 102 Programming Manual page 16

Programming Guide | VLT® HVAC Drive FC 102
UNINTENDED START
When the drive is connected to AC mains, DC supply, or load sharing, the motor may start at any time. Unintended start during
programming, service, or repair work can result in death, serious injury, or property damage. Start the motor with an external
switch, a fieldbus command, an input reference signal from the local control panel (LCP), via remote operation using MCT 10
software, or after a cleared fault condition.
Disconnect the drive from the mains.
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Press [Off/Reset] on the LCP before programming parameters.
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Ensure that the drive is fully wired and assembled when it is connected to AC mains, DC supply, or load sharing.
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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.
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Disconnect AC mains, permanent magnet type motors, and remote DC-link supplies, including battery
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backups, UPS, and DC-link connections to other drives.
Wait for the capacitors to discharge fully before performing any service or repair work. The discharge time
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is specified on the drive nameplate.
Use a measuring device to make sure that there is no voltage before opening the drive or performing any
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work on the cables.
USING THE SAFE TORQUE OFF
When using the Safe Torque Off, always follow the instructions in the VLT® Frequency Converters - Safe Torque Off Operating
Guide.
CONTROL SIGNALS
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, for example, when controlling the electromagnetic brake function of a hoist
application, do not rely on these control signals exclusively.
HAZARDOUS SITUATIONS
Hazardous situations must be identified by the machine builder/integrator who is responsible for considering the necessary
preventive means. More monitoring and protective devices may be included, always according to valid national safety
regulations, for example, law on mechanical tools and regulations for the prevention of accidents.
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WARNING
WARNING
NOTICE
NOTICE
NOTICE
AU430028034214en-001901 / 130R0310
Safety