Danfoss FC 300 Design Manual page 14

2. Safety and Conformity
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 FC 300 Operating Instructions (MG.33.A8.xx) for further safety guidelines.
2
Protection Mode
Once a hardware limit on motor current or dc-link voltage is exceeded, the drive will enter "Pro-
tection 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 drive while re-establishing full control of the motor.
In hoist applications, "Protection mode" is not usable because the drive will usually not be able to
leave this mode again, and therefore it will extend the time before activating the brake – which
is not recommended.
"Protection mode" can be disabled by setting parameter 14-26 "Trip Delay at Inverter Fault" to
zero which means that the drive will trip immediately if one of the hardware limits is exceeded.
2.2.1. Disposal Instructions
FC 300
This Design Guide can be used for all FC 300 adjustable frequency drives with software version 4.5x.
The software version number can be found in parameter 15-43.
14
Equipment containing electrical components may not be disposed of together with do-
mestic waste.
It must be collected separately as electrical and electronic waste in accordance with local
and currently valid legislation.
The FC 300 AutomationDrive DC link capacitors remain charged after power has
been disconnected. To avoid electrical shock, disconnect the FC 300 from the line
supply before carrying out maintenance procedures. When using a PM motor, make
sure it is disconnected. Before servicing the adjustable frequency drive, wait the
minimum amount of time indicated below:
380-500 V 0.33-10 hp [0.25-7.5
kW]
15-100 hp [11-75 kW] 15 minutes
125-300 hp [90-200
kW]
350-550 hp [250-400
kW]
525-690 V 50-350 hp
kW]
450-750 hp [315-560
kW]
Software version: 4.5x
MG.33.B9.22 - VLT
4 minutes
20 minutes
40 minutes
[37-250 20 minutes
30 minutes
FC 300
Design Guide
® is a registered Danfoss trademark.
FC 300 Design Guide