NORD Drivesystems BU0550 - Manual (Page 58)

PLC logic for NORD SK 54xE frequency inverters
58 BU 0550 GB-0813
3.5.2.9 MC_Control
This function block is used to control the FI and provides possibilities for forming the FI control word in a
more detailed manner than with MC_Power. The FI is controlled via the inputs ENABLE,
DISABLEVOLTAGE and QUICKSTOP, please refer to the following table.
Table 79 Assignment of control inputs (  = The level at the input is not important)
The active parameter set can be set via the input PARASET.
If the output STATUS = 1, the FI is switched on and current is supplied to the motor.
Table 80 MC_Control
3.5.2.10 MC_ReadStatus
Reads out the status of the frequency inverter. The status machine is orientated to the PLCopen
specification "Function blocks for motion control". The status is read out for as long as ENABLE is set to 1.
Table 81 MC_ReadStatus
Inputs module Frequency inverter behaviour
ENABLE QUICKSTOP DISABLEVOLTAGE
High Low Low The frequency inverter is switched on.
Low Low Low The frequency inverter brakes to 0Hz (P103) and then disconnects the
motor from the voltage supply.
  High The frequency inverter is disconnected from the voltage supply imme-
diately and the motor runs to a standstill without braking.
 High Low The frequency inverter runs to a quick stop (P426) and then discon-
nects the motor from the voltage supply.
VAR_INPUT VAR_OUTPUT
Input Explanation Type Output Explanation Type
ENABLE Enable BOOL STATUS Motor is supplied with current BOOL
DISABLEVOLTAGE Voltage is disconnected BOOL ERROR Error in FB BOOL
QUICKSTOP Quick stop BOOL ERRORID Error code INT
PARASET Active parameter set
Value range: 0 - 3
BYTE
ERRORID Explanation
0 No error
1001h Stop function is active
1300h The FI is in an unexpected state
VAR_INPUT VAR_OUTPUT
Input Explanation Type Output Explanation Type
ENABLE Enable BOOL VALID Output is valid BOOL
ERROR Error in FB BOOL
ERRORSTOP FI has an error BOOL
DISABLED FI output stage is switched off BOOL
STOPPING A Stop command is active BOOL
DISCRETEMOTION One of the three positioning FBs is active BOOL
CONTINUOUSMOTION The MC_Velocity is active BOOL
HOMING The MC_Home is active BOOL
STANDSTILL The FI has no active Move command. It is at a
standstill with speed 0 rpm and the output stage
switched on. BOOL