5
Electrical Installation
Electrical Installation
Electrical Installation
Electrical Installation
52
07-02-12-02-EN-V1215.doc / Type:
638
5.2
Power Mains Connection
●
Types of power mains
The 638 servo drives can be directly connected to TT- and TN-Systems
(TT- and TN-Systems are three-phase systems with grounded neutral).
When using the servo drive in IT mains (three-phase systems without grounded neutral),
isolation transformers must be used.
The secondary neutral must be grounded and connected to the 638 protective ground conductor.
General is valid, that with a phase-earth voltage (rated isolation voltage) > 300V AC the
isolation requirements (necessary clearance- and creapage distance, Test voltage, etc.)
Concerning the EC Low Voltage Guideline is not filled anymore and so that the CE conformity
is not given.
●
Mains supply voltage range 638A
The nominal supply voltage range is 1/3*230V AC +/-10%.
Respective intermediate transformers must be used for higher supply voltages.
With grounded power mains, autotransformers can also be used to adjust the voltage.
Neutral does not have to be connected for this type of transformer.
It is possible to use a lower supply voltage range. Note: In this case the internal DC–BUS capacity
may be not high enough (specially in 1 phase mains supply) and the user has to adjust the
undervoltage monitoring parameter of the drive.
●
Mains supply voltage range 638B
The nominal supply voltage range is 3*400 / 480 AC +/-10%.
It is possible to use a lower supply voltage range. Note: In this case the internal DC–BUS capacity
may be not high enough and the user has to adjust the undervoltage monitoring parameter of the
drive.
●
Protective Ground Connection (PE)
The following information concerning the protective ground connection corresponds to
EN 61800-5-1 Item 4.2.5.4.1and 4.2.5.4.2.
–
Cable cross section
The cross section for the protective ground conductor at X60 corresponds to the external
conductor.
The 638 servo drive is a devices with increased leakage current (larger than 3,5 mA AC or 10mA
DC). Therefore a second protective ground conductor must be connected at the case-groundbolt.
(with the same cross-section as the first protective ground conductor on X60).
●
Dimensioning of power mains cable and the over-current protection
The cross-section from the power main cable and the rated current for the over-current protection
should be dimensioned for the average current load to be expected.
In the supply line a protection about a protective circuit breaker or fuse shall be provided.
Circuit breakers with tripping-characteristic C or fuses with tripping-characteristic gM are to be
used.
One determines the load to be expected on the average as follows:
1-phase supply:
[ ]
[ ]
[ ]
V
U
VA
S
A
I
Netz
mains
=
3-phase supply:
[ ]
[ ]
[ ]
V
U
VA
S
A
I
Netz
mains
×
=
3
The apparent power S can be calculated to that as follows:
[ ]
[
]
[
]
60
1
min
2
−
×
×
×
×
=
average
eff
n
k
Nm
M
VA
S
π
The constant k for the different servo drives can be taken from the following table:
This manual was downloaded on www.sdsdrives.com
+44 (0)117 938 1800 - info@sdsdrives.com
