Danfoss vlt series Operating Instructions Manual page 7

2 Safety and Conformity
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.
Systems where frequency converters are installed must, if necessary, be equipped with additional monitoring and protective devices
according to the valid safety regulations, e.g law on mechanical tools, regulations for the prevention of accidents etc. Modifications on
2
the frequency converters by means of the operating software are allowed.
NB!
Hazardous situations shall be identified by the machine builder/ integrator who is responsible for taking necessary preventive means
into consideration. Additional monitoring and protective devices may be included, always according to valid national safety regulations,
e.g. law on mechanical tools, regulations for the prevention of accidents.
NB!
Crane, Lifts and Hoists:
The controlling of external brakes must always have a redundant system. The frequency converter can in no circumstances be the
primary safety circuit. Comply with relevant standards, e.g.
Hoists and cranes: IEC 60204-32
Lifts: EN 81
Protection Mode
Once a hardware limit on motor current or dc-link voltage is exceeded the frequency converter will enter "Protection mode". "Protection mode" means a
change of the PWM modulation strategy and a low switching frequency to minimize losses. This continues 10 sec after the last fault and increases the
reliability and the robustness of the frequency converter while re-establishing full control of the motor.
In hoist applications "Protection mode" is not usable because the frequency converter will usually not be able to leave this mode again and therefore it
will extend the time before activating the brake – which is not recommendable.
The "Protection mode" can be disabled by setting par. 14-26
immediately if one of the hardware limits is exceeded.
NB!
It is recommended to disable protection mode in hoisting applications (par. 14-26
The DC link capacitors remain charged after power has been disconnected. To avoid electrical shock hazard, disconnect the frequency
converter from mains before carrying out maintenance. When using a PM-motor, make sure it is disconnected. Before doing service
on the frequency converter wait at least the amount of time indicated below:
Voltage
380 - 500 V
525 - 690 V
For further information, please see the VLT Automation Drive FC 300 Operating Instructions, MG.33.AX.YY or the VLT Automation Drive FC 300 Design
Guide, MG.33.BX.YY
x = version number
y = language
6
Trip Delay at Inverter Fault to zero which means that the frequency converter will trip
Power
0.25 - 7.5 kW
11 - 75 kW
90 - 200 kW
250 - 800 kW
11-75 kW (frame size B and C)
37 - 315 kW (frame size D)
355 - 1000 kW
MI.33.G3.02 - VLT® is a registered Danfoss trademark
FC 300 Extended Relay Card Operating In-
Trip Delay at Inverter Fault = 0)
Waiting Time
4 minutes
15 minutes
20 minutes
40 minutes
15 minutes
20 minutes
30 minutes
structions