Dinverter
A
User Guide
Issue code: d2au9
29
As an alternative to fuses, an
MCB
(miniature circuit breaker) or
MCCB
(motor control circuit breaker) may be used if equipped with
adjustable thermal and magnetic trip devices of suitable ratings.
Table 4–2
Fuse ratings
Model
Fuse rating
DIN1220025A
6A
DIN1220037A
6A
DIN1220055A
10A
DIN1220075A
16A
UL listing
The Drive complies with the UL listing only when a fuse of the following
type is used:
Bussmann Limitron KTK–XXA (fast-acting type)
(600V
AC
100kA breaking capacity 10.3 x 38mm midget fuse)
AC
supply disturbances – use of line reactors
When a Drive is connected to an
AC
supply which is subject to severe
disturbances – for example, if any of the following conditions apply...
•
Capacity exceeds 200kVA
•
Fault current exceeds 5kA
•
Power-factor correction equipment is connected close to the Drive
•
Large
DC
Drives having no or ineffective line reactors are connected
to the supply
•
Direct-on-line started motor(s) are connected to the supply and,
when any of these motors are started, a dip is produced in excess of
20% of the actual supply voltage
... excessive peak current may flow in the input power circuit of the Drive.
This may cause nuisance tripping or, in extreme cases, failure of the Drive.
In such cases install a line reactor between the
AC
supply and the Drive
(when an RFI filter is used, install the line reactor between the RFI filter and
the Drive). This will reduce transient currents to a level that can be
tolerated by the input rectifier of the Drive.
Caution
RFI filters (for EMC purposes) do not give adequate
protection against these conditions.
Note
When an
AC
line reactor is installed, at power-up it may
cause current-ringing in conjunction with the
DC
-bus
