Danfoss VLT HVAC Design Manual page 12

2 Introduction to VLT HVAC Drive
Installation at high altitudes
Installation at high altitude:
380 - 500 V, enclosure A, B and C: At altitudes above 2 km, please contact Danfoss regarding PELV.
380 - 500 V, enclosure D, E and F: At altitudes above 3 km, please contact Danfoss regarding PELV.
525 - 690 V: At altitudes above 2 km, please contact Danfoss regarding PELV.
2
Warning against Unintended Start
1.
2.
3.
Consequently, disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures
to ensure the power can not be inadvertently energized. Failure to follow recommendations could result in death or serious injury.
Warning:
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. Refer to the Operating Instructions for further safety guidelines.
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 (V)
200 - 240
380 - 480
525-600
525-690
Be aware that there may be high voltage on the DC link even when the LEDs are turned off.
2.1.2 Disposal Instruction
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The motor can be brought to a stop by means of digital commands, bus commands, references or a local stop, while the
frequency converter is connected to mains. If personal safety considerations make it necessary to ensure that no unintended
start occurs, these stop functions are not sufficient.
While parameters are being changed, the motor may start. Consequently, the stop key [STOP/RESET] must always be acti-
vated; following which data can be modified.
A motor that has been stopped may start if faults occur in the electronics of the frequency converter, or if a temporary overload
or a fault in the supply mains or the motor connection ceases.
4 15
1.1 - 3.7 kW 5.5 - 45 kW
1.1 - 7.5 kW 11 - 90 kW
1.1 - 7.5 kW 11 - 90 kW
11 - 90 kW
Equipment containing electrical components may not be disposed of together with domestic
waste.
It must be separately collected with electrical and electronic waste according to local and cur-
rently valid legislation.
MG.11.B9.02 - VLT
Min. Waiting Time (Minutes)
20
110 - 250 kW
45 - 400 kW 450 - 1400 kW
® is a registered Danfoss trademark
®
VLT HVAC Drive Design Guide
30 40
315 - 1000 kW