Eltek Valere Theia He-t User Manual page 67

8.1.1. Discharge
High voltages are still present inside the inverter after the DC switch is switched OFF. For
service or maintenance the inverter must be de-energized for either 1 hour, or for at least 10
seconds using an external resistance to quickly discharge the capacitor bank.
Prior to the discharge, the inverter upper cover must be removed by loosening the four screws
on the back of the inverter.
CAUTION: The inverter upper cover must be opened by authorized
service personnel only!
The discharge process using a resistor must be performed by Eltek Valere
authorized service personnel only, as it requires removal of the inverter upper cover,
which can damage internal components and invalidate the warranty!
• Use a WELWYN WH50 1K JI resistor from Farnell, order number 9508163, or similar
resistor.
• Attach clamps to the resistor.
• Keep the clamps on the two solder-pads labeled Discharge on the right side of the DC
capacitor banks for at least 10 seconds for the capacitors to discharge.
• Before performing work on the inverter, check with a voltmeter that the solder-pads and the
DC and AC terminals are voltage free!
• Put on the cover and fasten the screws with a torque of 1.0 Nm / 0.74 ft-lbf.
Figure 8.1.1: Discharging the capacitor bank inside the inverter
User Manual THEIA HE-t String Inverters
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357115.013 Issue 1.0, 2011 April
67