VLT ® 2000 Series After installation I Survey of terminals Below you will see a survey of all the terminals of a VLT frequency converter (3 x 380-460 V). The control signals and the terminals for the brake module are described at the bottom of this page. Motor Br. I Description of connection terminals Terminal 12: Internal voltage supply 24 V DC activates digital inputs such as Start/stop, Jog or Quick stop. Terminal 50: Internal voltage supply With 10 V DC voltage you can set an analogue control signal using a 1 kohm potentiometer with ter- minal 55 as reference. Terminal 18:
Start/stop (Digital input) When 24 V DC is applied the motor starts on condit- ion that − digital input 27 (Quick stop) is connected to 24 V DC. − you have made no local stop command (“Stop/reset” key). − f Max is > 0 Hz. − a reference signal has been given (see para. 402). Terminal 53: Analogue control voltage Using parameter 412 you can choose between 0 - +10 V DC or +10 - 0 V DC analogue voltage. The ter- minal is used together with terminals 50 and 55. The voltage value determines the output frequency and thus also the speed of the motor. Terminal 55: Analogue common Is used together with terminals 50 and 53 or together with terminal 60. Terminal 19:
Reversing (Digital input) When 24 V DC is applied to terminal 19, the motor starts reversing, either at once or after a stop com- mand. If you have chosen pulse start in para. 402 (terminal 18), the start reversing function of para. 403 is automatically a pulse-activated function. Terminal 60: Analogue control current Using parameter 413 you can choose between four different input signals: 0-20 mA, 4-20 mA, 20-0 mA or 20-4 mA. The current value determines the output frequency. Terminal 20: Digital common This terminal is the reference for all digital signals, including bus. Terminal 61: Not used Terminal 27: Stop (Digital input) When you apply 0 V you can give different stop sig- nals.
See also para. 404. Terminals 71-72: RS 232 port Connect the terminals to a PC, if you want to control the VLT frequency converter via PC software. Terminal 20 acts as digital common. Terminal 29: Jogging (Digital input) This terminal allows you to activate a fixed preprogrammed speed. See para. 405. Terminals 81-82: Brake resistor By means of these terminals you can connect the brake resistor on units with brake function. Note the live voltage 550 V DC. Terminal 46: Output Using parameter 408 you can choose between different output signals. The output is an open collector output, and a pull-up resistor of min. 600 ohm must therefore be connected to terminal 12 (+24 V).
16 MG.20.B6.02 – VLT is a registered Danfoss trademark Mains