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34006452EN/AC - Page 38
Maintenance
Frequency converter or parallel UPS with SSC (figure 28)
Note:
We recommend that you call on the after-sales support department to carry out these operations.
Static Switch Cubicle (figure 29)
Note:
We recommend that you call on the after-sales support department to carry out these operations.
During maintenance, the concerned UPS or
converter must be isolated from Mains 1, its
battery and the output circuits of the other units.
– inverter isolation
Proceed in the following order:
– shut down the inverter (press the "inverter off"
button for 3 seconds),
– open isolating switches Q5N, QF1 and Q1 for
that line.
The unit is powered down once the capacitors
have discharged (a few minutes).
In redundant systems with at least one redundant
UPS, the other UPSs (or converters) ensure
continuity of power to the load.
In non-redundant systems with a Mains 2, the
load is supplied by the Mains 2 and the Static
Switch Cubicle.
In non-redundant systems without a Mains 2, the
entire system must be shut down.
– start-up
Following servicing, proceed in the following
order:
– close switch Q1, then switches QF1, Q5N and
Q4S,
start the inverter (press the "inverter on"
button ).
Fig. 28: frequency converter exemple
During maintenance, the Static Switch Cubicle
must be isolated from Mains 2, the load and the
parallel UPSs.
– if work is required on the control electronics
alone, open cubicle switch Q4S (but not Q5N) and
cubicle fuse switches Q1 and Q2. The load can
then remain supplied by the UPSs. After
servicing, reclose fuse switches Q1, Q2 and
switch Q4S.
Caution:
When the Static Switch Cubicle is powered down
using the above procedure, only the control
electronics are in fact powered down. The power
circuits remain energized. Maintenance on the
static switch power circuits requires shutdown of
the UPSs and transfer of the load to the
maintenance bypass line.
– open switch Q5N, then the disconnector-fuses
Q1 and Q2 in the SSC;
– open switches Q5N, then switch Q4S on all the
UPSs (figure 29).
Caution:
Even in the maintenance bypass
configuration, the cubicle is only partially
shut down and the supply of power to the load
continues via switch Q3BP.
more extensive maintenance work on the Static
Switch Cubicle requires the entire system to be
shut down.
Fig. 29
mains 1
load
mains 1
mains 1
QF1
QF1
QF1
Q1
Q1
Q1
Q5N
Q5N
Q5N
7
6
mains 1
load
mains 1
mains 2
QF1
QF1
Q1
Q1
Q5N
Q5N
Q5N
Q3BP
Q4S