Internal Protective Devices Of The Cps; Short Circuit - Gtec CPS 6 Handbuch

I P
NTERNAL ROTECTIVE
The table below shows the sizes of the isolators of the CPS and the sizes of the battery fuses (SWBATT): these devices
are accessible from the front of the CPS.
There are also indications about the internal fuses (not accessible) protecting the input and output lines and the
maximum input and rated output currents. To install the CPS, see the block diagram in the "USE" section of the
"Description" paragraph.
Fuses are to be replaced with ones of the same size and the characteristics indicated in the table below.
CPS
Non-automatic switches
Mod.
[kVA] CPS input
SWIN
6 63A(4P)
10 63A(4P)
15 100A(4P)
* The max. input current refers to a rated load (PF = 0.9) and an input voltage of 346V (200V if P+N input) and a
battery charger charged with 4A.
** Valid in by pass mode and three phase input only. In normal mode L1=L2/L3.

SHORT CIRCUIT

If a failure occurs on the load, the CPS protects itself by limiting the value and duration of the current output (short-circuit
current). These values also depend on the operating status of the CPS at the time of the failure; there are two different
cases:
▪
CPS in NORMAL OPERATION: the load is switched instantaneously to the bypass line (I
input line is connected to the output without any internal protection (blocked after t>0.5s)
▪
CPS in BATTERY OPERATION: the CPS protects itself by providing a current equivalent to about 1.5 times the
rated current for 0.5s and turns itself off after this time has elapsed
The CPS is equipped with an auto-restart function. Following a short circuit and protection system cut-in, the CPS will
restart within 1 second of the fault occurring. If the fault persists after the fifth attempt to restart, the CPS will shut down.
If this occurs the problem downstream must be solved in order for normal CPS operation to be restored.
BACKFEED
The CPS has internal protection against backfeed through metal separating devices.
There is an output on the relay board (optional) for activating a releasing device to be installed upstream from the CPS.
The CPS has an internal device (redundant bypass power supply) which, when a failure occurs on the
machine, activates the bypass automatically, thus keeping the load powered without any internal protection
and without any limitation to the power supplied to the load.
Under these emergency conditions, any disturbance present on the input line will affect the load.
See also the "USE" section of the "Redundant Auxiliary Power Supply for Automatic Bypass" paragraph.
D
EVICES OF THE
Isolators and internal protective devices
CPS output / Maintenance /
Separate bypass
SWOUT / SWMB / SWBYP
63A(2P)
63A(2P)
100A(2P)
CPS
Battery fuse
SWBATT
32A gG 400V (10x38)
32A gG 400V (10x38)
50A gG 400V (14x51)
- 75 -
Current
Input
*
[A] Max
3P+N
P+N
L1** L2/L3
30A 12A 36A
49A 20A 60A
72A 28A 84A
2
t=25000A
Output
[A]
Rated
27A
45A
68A
2
s): the