Parker 890GTR, Product Manual

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Operations
4-8
890GTR Inverter Power Manual HA502996
Emergency Power Off (EPO)
80 KW String Inverter
The 890GTR is equipped with an Emergency Power Off (EPO) circuit and High Voltage Interrupt Loop (HVIL) circuit.
The EPO circuit relies on the presence of an external 24 volt dc supply to maintain a healthy condition. If this supply is interrupted,
the 890GTR AC contactor immediately opens, disconnecting the Grid power. This action is accomplished through a direct hardware
connection and does not require software to function. However, the 890GTR software does monitor the EPO condition and will
disable the inverter if EPO 24 volt dc is not present.
Note: EPO circuit does not disconnect the DC supply or the AC control
power. Removal of DC and/or control power should be incorporated in the system design if required.
The HVIL circuit is made up of two “dry” contacts integrated into the power connectors. If either power connector is not fully
engaged, then the HVIL circuit will open. It is recommended that the EPO and HVIL circuits are used together such that a break in
the HVIL circuit will also open the EPO circuit.
On the next page is a schematic representation of both EPO and HVIL circuits. Please note both EPO and HVIL circuits are polarity
insensitive.