ABB PVS800-57B, Руководство по обслуживанию, Страница: 12 / 78

12 Safety instructions

Performing electrical work
These precautions are for all personnel who do work on the inverter, its input and output
cables, the transformer or the photovoltaic generator system.
WARNING! Obey these instructions to prevent injury or death, or damage to the
equipment. You must be a qualified electrician to do installation and service work.
Do these steps before you do installation or maintenance work on the inverter
1. Clearly identify the work location. Make sure that there is an escape route available in
case of an emergency.
2. Disconnect and isolate. (Not all disconnectors provide sufficient isolation against
voltage surges.)
•
Disconnect the inverter from the AC supply (normally a disconnector or a breaker
on the HV side of the main transformer), because the AC disconnector or breaker
of the converter does not remove the voltage from the AC output busbars of the
inverter.
•
Disconnect the inverter from the DC power supply (usually the DC circuit breakers
of the solar array junction boxes or the DC combiner box) because the optional
DC disconnectors do not remove the voltage from the inverter input DC busbars or
fuses.
•
Open the AC main disconnection devices (AC breaker or AC switch disconnector)
of the inverter (Q2), the DC disconnector of the inverter (Q1), the auxiliary power
disconnectors of all the power sections (Q10), the optional 3-phase output switch
(F13). If the inverter is supplied from an external auxiliary power, disconnect also
that. For auxiliary power switches, note the following disconnection order:
a. Internal power supply (auxiliary power from main circuit) - open Q30
b. External power supply 400 VAC - open Q10 (auxiliary power circuit) - open Q30
(BAMU)
c. External power supply, not 400 VAC - open F12 (auxiliary power supply) - open
Q30 (BAMU).
•
Make sure that reconnection is not possible. Lock all of the disconnectors in the
open position and attach a warning notice to them.
•
After you disconnect the inverter, wait for at least 5 minutes to let the intermediate
circuit capacitors discharge before you continue.
3. Protect any other energized parts in the work location against contact.
4. Take special precautions when you do work near bare conductors.
5. Measure that the installation is not energized.
•
Make sure that the voltage measurement device works correctly by testing the
measurement device with a live voltage.
•
Use a voltage measurement device such as a multimeter with an impedance of at
least 1 M

and voltage measurement range up to 1000 V DC.
•
Make sure that the voltage between the inverter AC output terminals (L1, L2, L3)
and the grounding (PE) busbar is close to 0 V.
•
Make sure that the voltage between the inverter module UDC+ and UDC-
terminals and the grounding (PE) busbar is close to 0 V.
•
Make sure that the voltage between the DC input terminals DC+ and DC- and the
grounding (PE) busbar is close to 0 V.