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2 Safety
4.
The ground leakage currents are higher than 3.5 mA.
5.
Protection against motor overload is set by par. 1-90
tion
to data value [ETR trip] (default value) or data value [ETR warning]. Note: The function is initialized at 1.16 x rated motor current and rated
motor frequency. For the North American market: The ETR functions provide class 20 motor overload protection in accordance with NEC.
6.
Do not remove the plugs for the motor and line power supply while the adjustable frequency drive is connected to line power. Make sure that
2
the line power supply has been disconnected and that the necessary time has passed before removing motor and line power plugs.
7.
Please note that the adjustable frequency drive has more voltage inputs than L1, L2 and L3, when load sharing (linking of DC intermediate
circuit) and external 24 V DC have been installed. Make sure that all voltage inputs have been disconnected and that the necessary time has
passed before commencing repair work.
Installation at high altitudes
Installation at high altitude:
380–500 V, enclosure A, B and C: At altitudes above 6,561 ft, please contact Danfoss regarding PELV.
380–500 V, enclosure D, E and F: At altitudes above 9,842 ft, please contact Danfoss regarding PELV.
525–690 V: At altitudes above 6,561 ft [2 km], please contact Danfoss regarding PELV.
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 cannot 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 line power.
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 backup. Refer to the Instruction Manual for further safety guidelines.
The adjustable frequency drive DC link capacitors remain charged after power has been disconnected. To avoid an electrical shock
hazard, disconnect the adjustable frequency drive from line power before carrying out maintenance. Wait at least as follows before
doing service on the adjustable frequency drive:
2-2
Motor Thermal Protection
The motor can be brought to a stop by means of digital commands, bus commands, references or a local stop, while the
adjustable frequency drive is connected to line power. 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 adjustable frequency drive, or if a temporary
overload or a fault in the supply line power or the motor connection ceases.
MG.11.AB.22 - VLT
VLT
®
. If this function is desired, set par. 1-90
®
is a registered Danfoss trademark
HVAC Drive Instruction Manual
Motor Thermal Protec-
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