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Inverter power switch-on sequence
The terms and designations used in the table below refer to the diagrams in section
Connections of the DC supply
1. User turns charging switch [Q10] to position 1 (ON).
•
Charging of the inverter capacitors starts through the charging resistors [R10]:
•
Auxiliary contact 1-2 of charging switch [Q10] opens.
•
BSFC prevents the starting of inverters and the closing of DC
switch-disconnector [Q11].
•
BSFC monitors inverter U
•
INV STAT and PWR LEDs are on.
•
When the charging is complete (inverter DC voltage over 80% of nominal):
•
BSFC receives a U
•
BSFC connects operating voltage to the solenoid of DC switch-disconnector
[Q11]. The solenoid releases the locking mechanism, allowing operation of the
handle.
•
INV UDC and PWR LEDs are on.
•
The Charging OK light [P11] on the cabinet door is on, indicating that the
operation of the DC switch-disconnector [Q11] is allowed.
2. User turns DC switch-disconnector [Q11] to position 1 (ON).
•
Main contacts 1-2...7-8 of DC switch-disconnector [Q11] connect inverter(s) to DC
power supply.
•
Auxiliary contact 13-14 of DC switch-disconnector [Q11] closes.
•
Auxiliary contact 21-22 of DC switch-disconnector [Q11] opens, de-energizing the
solenoid. The Charging OK light [P11] on the cabinet door goes off.
•
INV UDC and PWR LEDs are on.
3. User turns charging switch [Q10] to position 0 (OFF).
•
BSFC receives a "main switch ON, charging switch OFF" signal through terminal
AUX2.
•
BSFC sends an enable signal to inverter through the fiber optic link.
•
INV UDC and PWR LEDs are on.
circuit.
signals through fiber optic link(s) INV1...INV3.
DC
signal from the inverter(s).
DC
Hardware description 17
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