KEB combivert R6-S, Applications Manual

Page: 154 / 168

Page 6.1 - 4 COMBIVERT R6-S © KEB, 2008-02
Project design
Control cabinet surface
Calculation of control cabinet surface: Air flow rate with fan cooling:
P
V
—
‒
———
∆ T • K
3,1 • P
V
——
‒
——
∆ t
A = [m
2
] V = [m
3
/h]
A = Control cabinet surface [m
2
]
∆ t = temperature differential
(standard value = 20K)
[K]
K = coefficient of heat transmission
(standard value = 5)
P
V
= power loss (see technical data)
V = air flow rate of fan
For more details please refer to the catalogs of the control cabinet manufacturers.
The COMBIVERT R6 serves in the operating mode as power supply and regenerative unit for supply of a DC
bus with the connected components (inverters). Furthermore the supplied regenerative energy of the DC bus
is refeed into the net via COMBIVERT R6.
A ‚sinusoidal‘ supply and regenerative current establishes in connection with a harmonic filter.
In operational case ‚feed-in‘ approx. 8% THD.
In operational case ‚regeneration‘ approx.12% THD.
Several R6 units can be switched parallelly to increase the supply and regenerative power.
The following basic requirements must be met for the operation as power supply and regenerative unit (stan-
dard operating mode):
- The sum of the DC link capacities of the connected inverters may not exceed the max. permissible DC
link capacity of the R6 units.
- The maximum motor DC load current of the connected drive must be ≤ than the maximum DC supply
current of the R6 unit.
- The motor DC load current in continuous operation must be ≤ than the DC supply rated current.
Observe OL function at high load currents.
- The maximum regenerative DC load current of the connected drive must be ≤ than the max. DC regene -
rative current.
- The regenerative DC load current in continuous operation must be ≤ than the DC regenerative rated
current.
Observe OL function at high load currents.
- The maximum permissible DC link capacity can be taken from the power data of the respective regene-
rative units!
∑ C
ZK capacitors
≤ max. permissible DC link capacity