ABB PRO-33.0-TL Series, Product Manual

Page: 16 / 136

16 Safety

Inverter isolation
To isolate the inverter from external power sources:
1. Open the main disconnector and circuit breaker(s) at the AC distribution board.
2. Set the DC switch on the bottom of the
inverter to the OFF position (-S and -SX
models).
WARNING!
The DC switch does not
isolate the DC input connectors or
fuses from the PV array.
Lock the DC switch in the OFF position when
you do work on the unit. To lock the DC
switch, pull out the locking tab and secure it
with a tag or a lock.
3. On the standard and -S models, open the DC switches and circuit breakers between the
inverter and PV array to isolate the inverter from the PV array. If it is applicable, do the
same on the -SX model.
4. Disconnect the AC cable from the inverter to completely isolate it from the electrical grid.
Note: Although the inverter's automatic disconnection switches isolate the inverter
electronics and solar array from the electrical grid, they do not completely isolate the
inverter from the electrical grid. There can still be a High AC voltage in the inverter and at
the AC cable terminals.
5. Wait at least 5 minutes for the internal capacitors to discharge.
6. Disconnect the DC cables from the inverter to completely isolate it from the PV array(s).
WARNING!
Do not disconnect the DC connectors while they are energized. The
DC connection terminals carry dangerous voltages (up to 1,100 V). Even in dim
conditions, the PV array supplies voltage to the inverter.
PV quick connectors (-SX model):
a) Make sure that the DC cables are marked
clearly for correct connection.
b) Put a 3.5 mm flat screwdriver into the
locking slot.
c) Pull the connectors apart.
d) Put protective caps on to the connectors to
prevent a safety hazard.
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