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Home Technologies Electromechanical Group Electromechanical - Industrial Electromechanical Industrial Knowledge Base The 590+ is enabled, but the main contactor doesn't close. Why?
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Electromechanical Industrial Knowledge Base The 590+ is enabled, but the main contactor doesn't close. Why?
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  • Electromechanical Knowledge Base & Frequently Asked Questions
  • Motion and Machine Controllers+
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      • How do I start troubleshooting a 590+?
      • What are the basic wiring connections required to run a motor, using the factory default drive?
      • How to Extract and Install Parameters to the 590+ Drive using DSE Lite
      • Why won't my motor run?
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      • 590+: Is the keypad detachable during operation?
      • Can I disable the field to run Brushed PMDC (Permanent Magnet DC motor) on a 590+?
      • Can I select between Manual Speed Reference and Line Speed Trim Setting for the same Analog Input?
      • Can you download a DSELite file into the drive when the drive is running?
      • How can I get the DSELite software the 590+ uses?
      • How can I make sure the motor will not start rotating until the speed pot is at 0?
      • How can I manually tune a 590+ drive to my motor?
      • How can I pre-trip "speed feedback" alarm before the drive trips?
      • How can I replace the control boards in 590+ Frame 1 and Frame 2 drives?
      • How can I set up a 590+ to be a field controller?
      • How can I upgrade a 590+ Frame 1 or 2 drive version 5.x or 7.x to version 8.x - Control Board and Configuration
      • How can the 590+ be programmed?
      • How can the drive configuration be reset to factory defaults?
      • How do I clone my 590+ Drive with the keypad?
      • How do I copy the configuration of one drive to another using the keypad?
      • How do I flash my 590+ drive to a newer Minor Revision of Firmware?
      • How do I know what firmware revision my 590+ is?
      • How do I set up a 590+ External Stack?
      • How to I configure the 590+ for Preset Speeds?
      • Is there anything I can check for a SEQ PRE READY alarm?
      • Modbus TCP/IP Addressing for the 590+ drive with the Ethernet Techbox
      • My DC590+ drive is displaying a Missing Pulse Alarm, what should I do?
      • The 590+ is enabled, but the main contactor doesn't close. Why?
      • Upgrading a control door from a 590 to a 590+
      • What accessories can be added to the 590+?
      • What analog and digital I/O is available on the 590+?
      • What are the Communication options for the 590+?
      • What are the communication settings for the 590+ for the P3 Port?
      • What are the differences between the 590 and 590+?
      • What are the minimum and maximum 3phase input ratings for the 590+?
      • What are the reference power supplies available to terminal connections on the 590+?
      • What are the types of Speed Feedback for the 590+?
      • What is the current overload rating for the 590+ drive?
      • What is the maximum operating altitude for the 590+?
      • What is the operating temperature for the 590+?
      • What safety standards does the 590+ meet?
      • What USB-serial adapter should I use?
      • Why does the drive fault to "Over-Voltage" after the drive is enabled?
      • Why does the drive fault to "speed feedback"?
      • Why does the drive fault to 3 phase-fail after the drive is enabled?
      • What I can I check for a CALIBRATION FAIL trip?
      • 590+ - Transferring a Configuration to a Drive with a Different Power Level
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      • What does "NET FAIL" indicate in DSE Lite when using a LinkNet Techbox module on my 590+ drive?
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    • What is an Autotune and how do I run one?
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    • 6053...6054...6055...? Techbox options
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The 590+ is enabled, but the main contactor doesn't close. Why?

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If the drive is enabled but the contactor is not closing with no faults present on the keypad, then you are likely missing two key inputs.

  • Are B8 and B9 connected to 24VDC? B8 and B9 are Program Stop and Coast Stop respectively. They require 24Vdc, if they do not then the drive will enter the "Program Stop" or "Coast Stop" operation immediately as a safety measure, in the event of power loss or emergency switch is implemented into the system
  • Are you running it in remote mode? If so, run the drive in local mode. If the drive runs fine in local mode try diagnosing the field bus communications or the control/status words being used.
  • Verify minimum wiring connections as outlined in this FAQ: 590+ Starter Wiring Connections in a Default Template

If there are faults present on the drive follow this quick link to the 590+ on Parker.com and look for the manual under "Product Support" and lookup your fault code. It will give starter troubleshooting assistance to diagnose the problem or take a look at the sidebar for "How do I start troubleshooting a 590+?"

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