 If the transistor in braking unit is damaged short (Page 16 / 50) BEST FC300 High-Performance Frequency Inverter Series User Manual

Chapter 2 Installation and Connection

FC300

 If the transistor in braking unit is damaged (short circuit), resistor will be very hot which is

easy to cause fire. Therefore, installing electromagnetic contactor on inverter input

terminal is recommended because it allows cutting off power when fault occurs.

 INFORMATION

 Cable must be of 75°C copper.

 Screw with proper strength. Loose screwing will lead to short circuit or wrong operation,

while over-tight screwing will result in damages to screws and terminals, and short

circuit or wrong operation too.

2.4.5Control Loop Connection

1. Terminal “COM”is the common terminal for control,please DO NOT ground the common

terminal.

2. The wiring of control loop should adopt shielded wire or twisted wire,meanwhile, it must

be wired separately from main loop and strong electricity loop.

3. Because the frequency input signal of control loop is tiny current, please use two

side-by-side contacts or twincontacts to avoid poor contact.

4. It is recommended to use 0.75mm cable for wiring control loop.

5. High voltage CANNOT be input into control loop, otherwise it will damage inverter.

2.4.6 Inverter Control Loop Terminal Row

10V AVI COM ACI AFM Y2A Y2B Y1A Y1B Y1C

COM X1 X2 X3 X4 X5 X6 X7 X8 +24V

Notes: Different models may have some changes, please in kind prevail!