Lenze 8200 Frequency inverters - Manual (Page 84)

Installation
8200SHB0199 4-27
4.2.4 Mains types/mains conditions
Please observe the restrictions of each mains type!
Mains Operation of the controllers Notes
With grounded neutral
(TT/TN mains) No restrictions Observe controller ratings.
Operation of several 820X controllers
connected to a mains 3AC / N / PE and
symmetrical distribution to the three
outer conductors excepted - Observe the load of the common N
conductor.
- For r.m.s. current see chapter 3.4
- Possibly enlarge the cross-section of the
N conductor.
With isolated neutral
(IT mains) Possible, if the controller is protected
from an earth fault in the supplying
mains
- by corresponding equipment which
detects the earth fault and
- immediately separates the controller
from the mains.
Safe operation in the event of an earth fault
in the output of the controller cannot be
guaranteed.
With grounded phase Operation is only possible with one
variant. Contact Lenze.
DC-supply via + U
G
/-U
G
The DC voltage must be symmetrical to
PE. The controller will be destroyed when
grounding + U
G
-conductor or -U
G
-conductor.
4.2.5 Combination with compensation equipment
-
The controllers take up a very low fundamental reactive power from the
supplying AC mains. Therefore compensation is not necessary.
-
If the controllers are operated at a mains with compensation, this equipment
must be used with chokes.
- For this, contact the supplier of the compensation equipment.
4.2.6 Specification of the cables used
-
The cables used must comply with the approvals required at the site
(e.g. UL).
-
The prescribed minimum cross-sections of PE conductors must be
maintained in all cases. The cross-section of the PE conductor must be at
least as large as the cross-section of the power connections.
-
The screening quality of a cable is determined by
- a good screen connection,
- a low screen resistance.
Only use screens with tin-plated or nickel-plated copper braids!
Screens of steel braid are not suitable.
- For the overlapping degree of the screen braid:
At least 70 % to 80 % with an overlapping angle of 90
•
.
Show/Hide Bookmarks