Argon user guide/Power supply safe discharging
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, or its wiring, that has been recently unplugged from the power line.
Safely discharging Argon drive[edit | edit source]
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:
- Remove power from J4 connector (both L and N lines). This can be done for example by unplugging the power cord from wall socket where the power comes from.
- Wait at least 3 minutes after de-energization to allow capacitor voltage discharge.
- Measure a DC voltage between VN and VP terminals of J4 connector with a multimeter rated at least up to 600 VDC as the worst case drive internal HV voltage may be over 400 VDC. Voltage has been successfully discharged if VN-VP voltage is less than 5 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 may be present even after weeks of wait. 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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