Keba SO84.115.S - Page 47

Operation Manual ServoOne Supply Unit
47
ID no.: 1101.21B.6-00 Date:04/2020
Mains connection conditions
So that the trouble-free operation of a ServoOne supply unit on the supply system
is ensured, there is a minimum requirement on the short circuit power on the mains
connection. The transition to the mains lter is dened as the mains connection.
The requirement is to be met to prevent degradations on the supply unit as well as
malfunctions in other devices that are connected in parallel to this mains connection and
to make possible a reliable operating state.
The term short circuit power is a theoretical value for an apparent power that occurs in
an electrical system if a short circuit is caused at a transition point.
ServoOne
supply unit
Short circuit
ratio Rsc
1)
Minimum requirements on the short circuit power
on the mains connection for trouble-free operation
SO84.040.S
(Sn = Pn = 26kW)
30 ... 50
800kVA ... 1300kVA
SO84.076.S
(Sn = Pn = 50kW)
1500kVA ... 2500kVA
SO84.115.S
(Sn = Pn = 75kW)
2250kVA ... 3750kVA
SO84.170.S
(Sn = Pn = 110kW)
3300kVA ... 5500kVA
SO84.375.S
(Sn = Pn = 250kW)
30 ... 50
10000kVA
SO84.540.S
(Sn = Pn = 360kW)
10000kVA
1) Rsc is dened as the short circuit ratio of the short circuit power (Sk) at the mains connection to the rated power (Sn) of the
ServoOne supply unit (Rsc = Sk/Sn).
Table 4.9 Mains connection conditions
Procedure:
1.
Dene the cable cross-section according to local regulations and conditions.
Use shielded cables where necessary and as shown in the connection diagrams.
2.
Wire the supply unit to the mains supply as per connection diagram
For further information on the permissible connection cross-sections and torques,
see chap.A.3, chap.A.6 and chap.A.7.
For data on the components, see chap.A.7, p.82 and following text.
Residual current device
Due to the leakage currents to be expected, the supply unit is not designed for usage
with a residual current device.
If local regulations nevertheless require the installation of a residual current device, the
following applies:
y In the event of a fault the supply unit can generate DC fault currents without
a zero crossing. The supply unit is therefore only allowed to be operated
with RCDs
1)
of type B for AC fault currents, pulsating or smooth DC fault
currents. The RCD used must also be suitable for operation with inverters and
servocontrollers. RCMs
2)
can also be used for monitoring tasks.
1) Residual Current Device
2) Residual Current Monitor
Electrical installation