Vacon NXP series User Manual

Also see for NXL series: User manual User manual

Vacon NXP series User Manual Manual pdf 8 page image

1vacon • 6 General informationLocal contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/1.4.1 IsolationThe control connections are isolated from the mains potential and the I/O ground is connecteddirectly to the frame of the AC drive. Digital inputs and relay outputs are isolated from the I/Oground. For digital input arrangements, see Chapter Digital input signal conversions on page 7.1.4.2 Analogue inputs (mA/V)Analogue inputs of I/O boards can be used as either current inputs or voltage inputs (see detaileddescription of each board). The signal type is selected with a jumper block on the board. In case thevoltage type input is used you still have to define the voltage range with another jumper block. Thefactory default value for the analogue signal type is given in the description of the board. For detailedinformation, see the description of the board in question.1.4.3 Analogue outputs (mA/V)In the same way as in the analogue inputs, the output signal type (current/voltage) can be selectedwith jumper except for some expander boards with analogue outputs used only with current signals.1.4.4 Control voltage (+24V/EXT +24V)The control voltage output +24V/EXT+24V can be used in two ways. Typically, the +24V control voltageis wired to digital inputs through an external switch. The control voltage can also be used to power-up external equipment, such as encoders and auxiliary relays.Observe that the specified total load on all available +24V/EXT+24V output terminals must notexceed 250mA. The maximum load on the +24V/EXT+24V output per board is 150mA. See Figure 3.Figure 3. Maximum loads on +24V/EXT+24V outputThe +24V/EXT+24V outputs can further be used to externally power-up the control board as well asthe basic and expander boards. If an external power supply is connected to EXT+24V output, thecontrol board, basic boards and expander boards remain live even if mains is lost on the AC drive.This ensures sufficient functioning of the control logic (not the motor control, however) and somealarms in exceptional power-loss situations. Furthermore, fieldbus links remain powered whichenables e.g. the Profibus Master to read valuable data on the AC drive.NOTE: The power unit is not powered through the EXT+24V and therefore the motor control does notwork if the mains is lost.+24Vout +24Vout +24Vout +24Vout +24Vout+ + + + = max. 250mAmax.150mAmax.150mAmax.150mAmax.150mAmax.150mA7224.emf