GFK-3111A PACMotion VFD AC Variable Speed Drive User Guide 29
Software protection against brake resistor overload is carried out within the drive. For correct protection of
the brake resistor, the following settings are required:
• Set P1-14 = 201 (where 201 is the default password setting for advanced parameter access).
• Enter the resistance of the brake resistor in P6-19 (Ohms).
• Enter the power of the brake resistor in P6-20 (kW).
Figure 22: Dynamic Brake Resistor with Thermal Overload Protection
L1/L
K1
PACMotion
VFD
DC+
K1 - Main Contractor
Thermal Overload / Brake Resistor
with internal Over Temperature switch
BR
L2/N L3
Dlx
+ 24 V DC
PACMotion VFD
Optional wiring
WARNING
It is highly recommended to equip the drive with a main contactor
in order to provide an additional thermal overload protection for the
braking resistor.
The contactor should be wired so that it will open when the resistor
overheats, otherwise the drive will not be able to interrupt the main
supply if the brake chopper remains closed (short-circuited) in a fault
situation.
It is also recommended to wire the thermal overload protection to a
digital input of the drive as an External Trip.
WARNING
The voltage level at these terminals may
exceed 800 V DC.
Stored charge may be present after
disconnecting the mains power.
Allow a minimum of 5 minutes discharge
after power off before attempting any
connection to these terminals.
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