Motor Thermal Protection - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide
Direction of Motor Rotation
The default setting is clockwise rotation with the
frequency converter output connected as follows.
Terminal 96 connected to U-phase
Terminal 97 connected to V-phase
Terminal 98 connected to W-phase
The direction of motor rotation is changed by
switching two motor phases.

Motor Thermal Protection

The electronic thermal relay in FC 300 has received the UL-approval for single motor protection, when
par. 1-90 Motor Thermal Protection is set for ETR Trip and par. 1-24 Motor current, I
rated motor current (see motor name plate).
Installation of Brake Cable
(Only for frequency converters ordered with brake chopper option).
The connection cable to the brake resistor must be screened.
1. Connect the screen by means of cable
clamps to the conductive back plate on
the frequency converter and to the metal
cabinet of the brake resistor.
2. Size the brake cable cross-section to
match the brake torque.
See Brake instructions, MI.90.FX.YY and MI.50.SX.YY for more information about safe installation.
NB!
Voltages up to 960 V DC, depending on the supply voltage, may occur on the terminals.
RS 485 Bus Connection
One or more frequency converters can be connec-
ted to a control (or master) using the RS485
standardized interface. Terminal 68 is connected
to the P signal (TX+, RX+), while terminal 69 is
connected to the N signal (TX-,RX-).
If more than one frequency converter is connec-
ted to a master, use parallel connections.
102
How to Install
No.
81, 82
MG.33.B8.02 - VLT ® is a registered Danfoss trademark
is set to the
M,N
Function
Brake resistor terminals