Argon user guide/Power supply safe discharging

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Power supplies and drives have capacitors that store electricity even when power supply has been disconnected from the power network. This poses electric shock hazard when touching a device that has been just unplugged from the power line.

Safely discharging Argon drive

Argon (servo drive) has internal power supply bleeding resistor that will discharge the capacitors during 5 minutes after AC power has been removed.

To safely discharge Argon voltages:

  1. Remove AC power (both L and N lines). This can be done for example by unplugging the power cord from wall socket where the power comes from.
  2. Wait 3 to 5 minutes after removing AC to allow capacitor voltage discharge.
  3. Measure a DC voltage between VN and VP terminals of J4 connector with a multimeter rated up to 600 VDC. Voltage has discharged if VN-VP voltage is less than 20 VDC.
If DC voltage between VN and VP terminals of J4 connector is above 20 VDC after 3 minutes of de-energization, drive has internal failure of discharging circuity. In such case danger is present even after 5 minutes. Contact your supplier first for further assistance before continuing servicing.

Discharging 24 VDC supply does happen instantly after 24 V has been removed. However, this does not affect AC side discharge in any way.


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