Direction Of Motor Rotation; Motor Thermal Protection; Installation Of Brake Cable; Rs 485 Bus Connection - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide

Direction of Motor Rotation

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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

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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 is set to the rated motor current (see motor name plate).
M,N

Installation of Brake Cable

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(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.
Size the brake cable cross-section to
2.
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

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One or more frequency converters can be
connected 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 connected
to a master, use parallel connections.
How to Install
MG.33.B4.02 - VLT is a registered Danfoss trademark
No. Function
81, 82 Brake resistor terminals
103