Parker 890GTR, Product Manual

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3-18
Installation
890GTR Inverter Power Manual HA502996
Start-up Sequence
Proper power up and starting sequence is required to successfully connect the DC supply with the Grid. Failure to follow an acceptable
sequence could result in damage to the inverter or associated equipment.
1. Apply control power —connect 120 Volt 50/60 Hz ac power to “control power in”. This supply is typically an
Uninterruptable Power Supply (UPS) for black start and VRT features. Maximum control power requirements: 120
Watts (150 VA).
2. Ensure Estop/EPO circuit is satisfied —an external 24 Volt DC supply is required to engage the main AC contactor.
This input is usually used in conjunction with a normally closed Estop pushbutton. Additionally, the High Voltage
Interrupt Loop contacts should be included in the Estop circuit. See Estop/EPO 3-14.
3. Close dc bus pre-charge contactor— the DC bus capacitors need to be pre-charged through a current limited circuit
(i.e. resistor) to prevent excessively high in-rush currents. Failure to properly pre-charge the bus could result in damage
to the inverter or associated equipment.
4. Ensure dc bus voltage is equal to DC supply voltage (+/-5%)— verify the dc bus is properly charged by query of the
DC LINK VOLTS parameter through the Modbus communication link.
5. Close dc main contactor— once the DC bus is fully charged, then the main DC contactor can be closed. This contactor
is part of the DC supply.
6. Disengage dc pre-charge contactor— opening the pre-charge contactor after closing the DC main contactor is
recommended to prevent damage to the pre-charge circuit in case the main contact opens unexpectedly.
7. Ensure both start and stop bits are cleared— the Modbus Start Request and Stop Request parameters are rising
edge sensitive and it is good practice to initialize them before attempting a start.
8. Clear faults— send a Fault Reset command to clear any extraneous faults that may have occurred during the startup
sequence.
9. Verify faults are all cleared— read the Tripped bit to ensure all faults are cleared. Correct any persistent faults before
proceeding.
10. Toggle start bit true then false— the Start Request bit is rising edge sensitive. It is good practice to return the start bit
to false once a request is sent.