Altivar 312 Variable Speed Drives Page 14 Introduction

14 Altivar 312 variable speed drives Functions Functions (continued) Jog operation This function is used for pulse operation with minimum ramp times (0.1 s), a limited speed reference and minimum time between 2 pulses. It is enabled by 1 logic input and pulses given by the operating direction command. This function is suitable for machines with product insertion in manual mode (e.g. gradual movement of the mechanism during maintenance operations). Command and reference channels There are several command and reference channels, which can be independent. Commands (forward, reverse, etc.) and speed references can be given via the following channels: Terminals (logic inputs and analog I/O) Local mode (STOP/RESET and RUN keys and navigation button) Remote display terminal Serial link: - Remote display terminal - Modbus control word - CANopen control word The command channels and speed reference channels can be separate. E.g. speed reference issued by CANopen and command issued by the remote display terminal. Note: The STOP/RESET keys on the Human-Machine interface keypad and the remote display terminal can retain their priority. The Summing inputs and PI regulator functions only apply to one reference channel. Reference switching Switching between 2 speed references can be enabled via: A logic input A bit in a Modbus or CANopen control word Reference 1 is active if the logic input (or control word bit) is at 0. Reference 2 is active if the logic input (or control word bit) is at 1. The reference can be switched with the motor running. Summing inputs This function is used to add together 2 to 3 speed references from different sources. The references to be added together are selected from all the possible types of speed reference. E.g. Reference 1 from AI1 Reference 2 from AI2 Reference 3 from AIP Drive speed reference = reference 1 + reference 2 + reference 3. Connection diagram for reference switching LIx COM AI1 AI2 AI3 + 24 V 10 V X-Y +10 0 (X is adjustable from 0 to 20 mA and Y is adjustable from 4 to 20 mA) 1 0 1 0 f (Hz) Forward or Reverse Speed reference: adjustable from 0 to 10 Hz, factory setting 10 Hz t tm JOG tm: fixed time of 0.5 s, minimum time between 2 pulses Example of jog operation 1 0 1 AI2 AI1 LIx 0 f (Hz) t Forward or Reverse Example of reference switching

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