GMP GM 3100 PRO, User Manual

Page: 80 / 275

80
P
ROTECTION DEVICES
S
HORT
-
CIRCUIT PROTECTION
In the presence of a fault on the load, the UPS limits the value and duration of the output current (short circuit current) for
protection. These values are also functions of unit status at the time of the fault. Two different cases can be distinguished:

UPS in NORMAL OPERATION: load is switched instantly on the bypass line (UPS 60kVA I
2
t=25000A
2
s; UPS 80kVA
I
2
t=110000A
2
s; UPS 100kVA I
2
t=145000A
2
s): the input line is connected to the output without any internal protection
(blocked after t>0.5s)
 UPS in BATTERY-LED OPERATION: The UPS protects itself by supplying a current of about 1.5 times the nominal
current in output for 0.5s, switching itself off after this amount of time
P
ROTECTION AGAINST BACK
-
FEED
The UPS is equipped with internal protection against backfeed via internal metal separation devices ( Inverter contactor , see
“UPS block diagram" ).
I
NPUT LINE THERMAL MAGNETIC SWITCHES
When setting the power supply line upstream of the UPS, install a thermal magnetic switch with trip curve C (or D depending on
the type of load) as indicated in the following table:
Automatic external AC protections *
Mod. UPS Network input Separate bypass input (optional)
60kVA 100A 100A
80kVA 125A 125A
100kVA 160A 160A
* In the case of non-linear loads, properly oversize neutral line N after on-site assessment
If the protection device upstream to the UPS interrupts the neutral conductor, all phase conductors must also be
interrupted at the same time (4-pole switch).
B
ATTERY LINE
Surge protector and a cut-off device must be provided on the UPS external battery line.
The size and type of fuses must be selected on the basis of the capacity of the installed battery box, referring to the table below.
External DC protections
Mod. UPS Fuse type Fuse size [ A ]
60kVA
gl / gG
2 x
capacity in Ah of the battery up to max 150A
aR 2.5 x capacity in Ah of the battery up to max 150A
80kVA
gl / gG
2 x
capacity in Ah of the battery up to max 200A
aR 2.5 x capacity in Ah of the battery up to max 200A
100kVA
gl / gG
2 x
capacity in Ah of the battery up to max 250A
aR 2.5 x capacity in Ah of the battery up to max 250A
Example: the following fuses can be used with UPS 60kVA and 65Ah batteries: 125A (130A) gl/gG or 150A type aR
Ensure that the UPS has been fully switched off before handling the external UPS battery line switch/fuses