2.1.5. Caution
The frequency converter DC link capacitors remain charged after power has been disconnected. To avoid an electrical shock hazard,
disconnect the frequency converter from the mains before carrying out maintenance. Wait at least as follows before doing service on
the frequency converter:
Voltage
Min. Waiting Time
4 min.
15 min.
20 min.
30 min.
200 - 240 V
0.25 - 3.7 kW
5.5 - 45 kW
380 - 480 V
0.37 - 7.5 kW
11 - 90 kW
110 - 250 kW
315 - 450 kW
525-600 V
0.75 kW - 7.5 kW
110 - 250 kW
315 - 560 kW
525-690 V
45 - 400 kW
450 - 630 kW
Be aware that there may be high voltage on the DC link even when the LEDs are turned off.
2.1.6. Avoid unintended Start
While the frequency converter is connected to mains, the motor can be started/stopped using digital commands, bus commands,
references or via the Local Control Panel.
•
Disconnect the frequency converter from mains whenever personal safety considerations make it necessary to avoid unintended start.
•
To avoid unintended start, always activate the [OFF] key before changing parameters.
•
Unless terminal 37 is turned off, an electronic fault, temporary overload, a fault in the mains supply, or lost motor connection may cause a
stopped motor to start.
2.1.7. Safe Stop of the Frequency Converter (optional)
For versions fitted with a Safe Stop terminal 37 input, the frequency converter can perform the safety function
Safe Torque Off
(As defined by draft CD
IEC 61800-5-2) or
Stop Category 0
(as defined in EN 60204-1).
It is designed and approved suitable for the requirements of Safety Category 3 in EN 954-1. This functionality is called Safe Stop. Prior to integration and
use of Safe Stop in an installation, a thorough risk analysis on the installation must be carried out in order to determine whether the Safe Stop functionality
and safety category are appropriate and sufficient. In order to install and use the Safe Stop function in accordance with the requirements of Safety
Category 3 in EN 954-1, the related information and instructions of the VLT AQUA Drive Design Guide MG.20.NX.YY must be followed! The information
and instructions of the Operating Instructions are not sufficient for a correct and safe use of the Safe Stop functionality!
VLT
®
AQUA Drive
Operating Instructions
2. Safety
MG.20.M5.02 - VLT
®
is a registered Danfoss trademark
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