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3. DC fuse blown. In this case, all units can in some
situations seem fine and work well as long as
mains is available. When there is no longer AC
available on the input (mains fail or generator is
stopped) the non-powered units are disconnected
from the system.
Solution: Check the fuse in all units; replace the
broken one.
4. Update firmware and Assistants of the inverter/
chargers and of the CCGX.
Systems with multiple slaves per phase
Error 17 can show on one or more slaves in a phase
(visible by looking at the LEDs, not on VRM or
CCGX). If the slaves can still communicate with each
other; then the error will only show on one slave: all
slaves that can see on the network that another slave
is already showing Error 17 will not show the error as
well.
Unable to solve
If after all above steps you are still experiencing a
VE.Bus Error 17, contact your dealer. Please provide
photos of the installation and network cabling.
Depending on the situation, they might advise to
replace the CCGX and the inverter/chargers. We
advise to first replace cables, and if that doesn't help
then thereafter only the CCGX at first, since that is
less work than replacing the inverter/chargers.
6.1.2.15 Error 18 - AC Over-voltage on the
output of a slave while switched off
Check if AC wires are not swapped by accident.
There can never be voltage on the AC out when a unit
is switched off.
6.1.2.16 Error 22 - This device cannot
function as a slave
This device is an obsolete and unsuitable model. It
should be replaced.
6.1.2.17 Error 24 - Switch-over system
protection initiated
This error indicates that one or more units report
feeding back a significant current through its back-
feed relay, while those relays are supposed to be open,
and -obviously- no current can flow through an open
circuit.
The back-feed relay is the relay that closes when
connecting to the grid or generator and which opens
when there is no power available, i.e. when the system
is in island- or invert-mode.
Error 24 is raised when a Multi or Quattro detects
current flowing through the back-feed relay during a
period when the relay should be open. This can mean
one of two things:
1. The relay did not open.
2. The related current measurement circuit is faulty.
Error 24 is a very rare error.
Possible causes in order of probability
– There is too much AC load connected at the
moment the relay needs to switch off. This large
current will prevent the relay contacts from
opening. Solution: remove excessive load. See
transfer switch capacity in the data-sheet for the
maximum rating.
– The AC input voltage slowly drops before it is
being rejected by the Multi’s. Typically happens
in installations with a generator. Especially when
combined with AC loads that increase their
current draw when the AC voltage drops: by the
time that the inverter/charger initiates the
disconnect, the current through the relays has
increased well beyond the ratings, and is too high
to open them. Solution: Make the Multi’s or
Quattros disconnect earlier: increase lower limit
of AC input voltage in VEConfigure3. For
example, to 210 VAC. The factory setting is 180
VAC.
– The back-feed relay has a hardware failure.
Solution: Replace faulty unit.
– The related current measurement circuit is faulty.
Solution: Replace faulty unit.
00_00_ZBP45_EN.book Page 54 Monday, October 19, 2020 9:52 AM
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