VLT ® 2000 Series I VLT control commands The four control and status bytes are used to send control commands to the frequency converter when the telegram is sent from the master, and to send sta- tus from the frequency converter to the master when the telegram is returned from the VLT frequency con- verter. When these four bytes are used for control, they have the following meaning: OFF 1: Makes a normal ramp stop of the motor and opens the relay output of the frequency converter (relay off). OFF 2: Makes a motor coast and opens the relay output (relay off). OFF 3: Same as OFF 1, but the motor makes a quick-stop. Bit 10:
This bit has to be 1, if any of the control commands should cause a reaction. The control possibilities of the VLT Section 1 Section 2 Section 3 Note: Each byte consists of 8 bits, but the frequency converter uses only the last 4 bits.
MG.20.B6.02 – VLT is a registered Danfoss trademark 57 ASCII 0 / 1 Control word Byte 8 Byte 7 Byte 6 Byte 5 N O F U N C T I O N / R E V E R S I N G S E T U P S E L E C T 1 / 2 N O F U N C T I O N S P E E D S E L E C T M S B S P E E D S E L E C T L S B D A T A N O T V A L I D / V A L I D N O F U N C T O N J O G 1 O F F / O N N O F U N C T O N / R E S E T R A M P S T O P / S T A R T H O L D / E N A B L E R A M P Q U I C K S T O P / R A M P O N M O T O R C O A S T I N G / E N A B L E O F F 3 / O N 3 O F F 2 / O N 2 O F F 1 / O N 1 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 @ A B C D E F G H I J K L M N O P - 1/2 byte 0 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1 0 0 0 1 0 0 1 1 0 1 0 1 0 1 1 1 1 0 0 1 1 0 1 1 1 1 0 1 1 1 1 X X X X X X X X 1/2 byte 0 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1 0 0 0 1 0 0 1 1 0 1 0 1 0 1 1 1 1 0 0 1 1 0 1 1 1 1 0 1 1 1 1 X X X X X X X X 1/2 byte 0 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1 0 0 0 1 0 0 1 1 0 1 0 1 0 1 1 1 1 0 0 1 1 0 1 1 1 1 0 1 1 1 1 X X X X X X X X 1/2 byte 0 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1 0 0 0 1 0 0 1 1 0 1 0 1 0 1 1 1 1 0 0 1 1 0 1 1 1 1 0 1 1 1 1 X X X X X X X X