1.1.7. Caution
Caution
The adjustable frequency drive DC link capacitors remain charged after power has been dis-
connected. To avoid the risk of electrical shock, disconnect the adjustable frequency drive
from line power before performing maintenance procedures. Wait at least as long as follows
before servicing the adjustable frequency drive:
Voltage
Min. Waiting Time
4 min. 15 min.
200 - 240 V 1.5-5 hp [1.1-3.7 kW] 7.5-60 hp [5.5-45 kW]
380 - 480 V 1.5-10 hp [1.1-7.5 kW] 15-125 hp [11-90 kW]
525 - 600 V 1.5-10 hp [1.1-7.5 kW]
Be aware that there may be high voltage on the DC link even when the LEDs are turned off.
1.1.8. Installation at High Altitudes (PELV)
At altitudes above 6,600 feet [2 km], please contact Danfoss Drives regarding
PELV.
1.1.9. Avoid unintended Start.
While the adjustable frequency drive is connected to line power, the motor can be started/stopped
using digital commands, bus commands, references or via the Local Control Panel.
• Disconnect the adjustable frequency drive from line power 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
line supply or lost motor connection may cause a stopped motor to start.
1. Safety VLT
®
HVAC Drive Instruction Manual
6
MG.11.A4.22 - VLT
®
is a registered Danfoss trademark
1
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