Power Supply /Regenerative Operation At Parallel Operation Of Combivert R6-S With Recovery Contactor - KEB COMBIVERT R6 Instruction Manual

Connection Power Unit
4.4.6 Power supply /regenerative operation at parallel operation of COMBIVERT R6-S with
recovery contactor
Regenerative inverter currents > current of one R6-S
2
1
L1
L2
L3
12
PE
1 Mains fuse
2 Mains contactor
2a Regenerative contactor
3 Mains fuse type gR
4 HF filter
1) Current sharing between R6‑S and frequency inverter must be observed during supply operation. The current sharing is depending on the uk‑
value and the rated current of the mains chokes /commutation chokes (see formula page 18 below). A mains choke with uk=4 % is mandatory
required for reduction of circulating currents.
2) The cable cross‑section may not be smaller than 10 mm². It must be dimensioned for the DC rated current of the load. Otherwise there are fuses
in the DC link circle (10) necessary The indicated maximum protection for the connected frequency inverters must be observed !
3) If the inverter current > current of the COMBIVERT R5‑S it must be wired at an external terminal (12).
4) The regenerative contactor may only be connected if the precharging in the DC link circle of the inverter is completed. If the precharging of R6‑S
and frequency inverter is in the same DC branch, regenerative contactor are eventually not necessary (depending on the charging resistors
and the DC link capacity).
5) Parallel connection of the frequency inverter and R6‑S causes a circulating current in regenerative operation. It is depending on the inductance
of the mains‑/ commutation chokes. The entire regenerative power is 75... 90 % of the R6‑S regenerative power.
6) In case of parallel connection of R6‑S the total power can be smaller up to 15 % caused by production tolerances of the commutation choke. The
impedance voltages uk of the commutation chokes must be the same in case of parallel connection of R6‑S with different sizes.
4
3
L1
L2
L3
2a
4
3
L1
L2
L3
12
4
L1 L1'
L2 L2'
L3 L3'
5 Commutation choke
6 Mains choke
7 COMBIVERT R6-S
4)
8 Inverter with DC output
X2B X2B
5
L1' L12
L1.1 L1.2
L2' L2.1 L2.2 L22
L3' L3.1 L32
L3.2
X2B X2B
5
L1' L1.1 L1.2 L12
L2' L2.1 L2.2 L22
L3' L32
L3.1 L3.2
6
PE
L1
L2
L3
6
PE
L1
L2
L3
5) 6)
1) 5)
7
++
++
- -
PE - -
7
++
++
12
- -
PE - -
8 10
- -
-
PE
9
8
11
- -
-
PE
9
9 Motor
10 DC fuses type aR/gR
11 DC fuses type aR/gR
12 External terminal
2)
3)
GB - 21