The HV600 drive is set by default to automatically restart when power is lost momentarily or for an extended period of time and a RUN command is present. Under a certain circumstance, the drive may not automatically restart due to the built-in Real Time Clock resetting itself at every power-up (pictured below). 

Note: The following parameters are set by default to allow the HV600 drive to automatically restart in AUTO and/or when a physical RUN command is present:

• b1-17 = 1 (Allows the drive to accept an existing RUN command at power-up)
• L2-01 = 2 (Allows the drive to ride through a momentary power loss as long as the CPU is active)
• S5-10 = 2 (Keeps the AUTO mode status when the drive is de-energized)

Follow the steps below if the Real Time Clock is resetting itself at every power-up on HV600 drives:

1. Make sure the plastic tab (insulation sheet or battery tab) behind the keypad's battery compartment is removed. If this tab is left in, the Real Time Clock will lose its memory every time there is a power loss event and the drive will power up in an alarm state (background) prohibiting the drive from automatically restarting. The picture below indicates where the plastic tab is located.
   
    
2. Set the time and date after removing the plastic tab. Refer to the document: Setting the Date and Time on a HV600, GA800 and GA500 with LCD Keypad
3. Verify the Real Time Clock is set by viewing the time on the upper left corner of the keypad.
   
4. If control wires are landed on H1-HC or H2-HC, make sure that the circuit is closing prior to the drive powering on. Could test by using jumper wires instead of control wires.