Troubleshooting "Bypass Mode - Gamatronic CENTRIC 50 kW User Manual

10.3

Troubleshooting "Bypass mode"

This procedure is to be performed only as directed by Table 11 above.
1. The load can be transferred to bypass for any of the following reasons:
a) command from the controller: either a manual command, or due to overload of the inverter.
b) command from the static switch panel.
c) command from a parallel connected UPS, if any.
d) inverter voltage zero for more than 3 ms.
e) brownout (±30 %) for more than 4 ms
f) RMS voltage ±10 % for more than 100 ms
g) inverter contactor fault.
h) SCR fault.
In cases "g" and "h" above, the load is locked on bypass to prevent recurring back-and-forth transfer
of the load. Such repeated rapid transfer can be dangerous for the load. The load will also be locked
on bypass automatically if the static switch performs 7 load transfers in 10 minutes. To return the load
to the inverter in such cases, issue the following instruction from the controller:
("Operation > Load > Transfer load to inverter").
2. To transfer the load manually from the static switch panel (Figure 7), press and hold the INV/BYP
button for about 10 seconds until the Alarm LED changes color; then release the button.
3. If the static switch could not transfer the load to the inverter, and the load is locked on bypass after
each attempt to transfer the load to the inverter, the static switch must be repaired. Either the static
switch's inverter cantactor or SCR is faulty.
CENTRIC User Guide, rel. 3.4
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AMATRONIC LECTRONIC
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NDUSTRIES TD
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