METSO IOP302 Redundant module

Dynamic braking is implemented by control of the PLC output A1, which can be used to switch a contactor used to connect the brake resistors across the motor windings (see Figure 4-9). When P37=‘5’ (P37 controls the use of output A1) and the drive is deenergised by an error or an emergency stop, the A1 output transistor turns OFF (A1=0) and a decimal point is shown in the front panel display. This arrangement allows the drive with the error or active stop to be identified. The result of output A1 turning OFF ito turn ON the contactor which disconnects the motor from the drive and connects it to the dynamic brake load.

Operation and Control

 You can program an SV-M or SV-S drive using front panel controls or via an RS232 interface. For RS232 serial control refer to Appendix B which describes PC control and the use of the parameter editor software supplied with the drive. The use of the front panel controls is described later in this Section in the sub-section entitled Front Panel Operation. Functions performed by the drive are controlled by values assigned to parameters, for example you could make simple selections, such as switching between two frequency compensation values by writing a ‘0’ or a ‘1’ to parameter P25. Where a fine control of parameter values is required, 3 digit integer values can be assigned and scaled to represent real values of current, voltage, torque etc.

If you need to know the current state of the drive

for example which PLC inputs are active or what motor type the drive is currently configured for, you may examine status values such as S14 or S37. Status values can be read from the front panel display or over the RS232 serial link. If an unexpected condition arises within the drive whilst you are programming it, or whilst it is operating, it will generate a coded error message which will be displayed as E, whererepresents the error number. All parameter values and status values are described in this section. Error message definitions are described in the Maintenance and Troubleshooting section.

Common problem

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