Troubleshooting; Warning - Growatt WIT 50K-A User Manual

9.2 Troubleshooting

It must be operated by trained and professional electrical technicians.
Ÿ
Technicians must observe instructions in this manual and local
regulations.
If the WIT Inverter reports the "PV Isolation low" alarm, do not touch
Ÿ
the equipment as a ground fault might have occurred.
DANGER
Ÿ Beware of high voltages which can cause electric shocks.

9.2.1 Warning

Warnings indicate abnormal situations of WIT 50-100K Storage/Hybrid Inverters, leading
to a reduction in the output power. The warning sign will disappear once the fault is
rectified by restarting the inverter or reconfiguring the system. The warning codes are
shown in Table 9.1:
Table 9.1Warning codes
Warning Description
Warning 200 String fault
PV string/PID quick-
Warning 201 connect terminals
abnormal
DC SPD Warning DC SPD function abnormal
Warning 203 PV1 or PV2 short circuited
Boost Warning PV Boost driver abnormal
AC SPD Warning AC SPD function abnormal
Warning 208 DC fuse blows
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Suggestion
1. Check if the PV panels are normal
after shutdown.
2. If the error message persists, contact
Growatt support.
1. Check the wiring of the string
terminals after shutdown.
2. If the error message persists, contact
Growatt support.
1. Check the DC SPD after shutdown.
2. If the error message persists, contact
Growatt support.
1. Check if PV1 or PV2 is short
circuited.
2. If the error message persists, contact
Growatt support.
1. Restart the inverter.
2. If the error message persists, contact
Growatt support.
1. After shutdown, check the AC SPD.
2. If the fault persists, contact Growatt.
1. Power off the system and check the
fuse.
2. If the fault persists, contact Growatt.
Warning Description
DC input voltage exceeds
Warning 209
the upper threshold
PV string is reversely
PV Reversed
connected
Warning 219 PID function abnormal
Warning 220 PV string disconnected
PV string current
Warning 221
unbalanced
No utility grid connected or
Warning 300
utility grid power failure
Grid voltage is beyond the
Warning 301
permissible range
Grid frequency is beyond
Warning 302
the permissible range
Warning 303 Overload
Warning 308 Meter disconnected
Meter is reversely
Warning 309
connected
Suggestion
1. Turn off the DC switch immediately
and check the DC voltage.
2. If the DC voltage is within the
specified range and the error message
persists, contact Growatt support.
1. Check the polarity of the PV
terminals.
2. If the error message persists, contact
Growatt support.
1. Restart the inverter.
2. If the error message persists, contact
Growatt support.
1. Check if the PV string is properly
connected.
2. If the error message persists, contact
Growatt support.
1. Check if the PV panels of the
corresponding string are normal.
2. If the error message persists, contact
Growatt support.
1. Check if the grid is down.
2. If the error message persists, contact
Growatt support.
1. Check if the grid voltage is within the
specified range.
2. If the error message persists, contact
Growatt support.
1. Check if the grid frequency is within
the specified range.
2. If the error message persists, contact
Growatt support.
1. Please reduce the load connected to
the EPS output terminal.
2. If the error message persists, contact
Growatt support.
1. Check if the meter is properly
connected.
2. If the error message persists, contact
Growatt support.
1. Check if the L line and the N line of
the meter are reversely connected.
2. If the error message persists, contact
Growatt support.
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