Wiring Scheme 'B' With Parallel Regen Units - KEB combivert R6-S Instruction Manual

Connection Power Unit

4.4.5 Wiring Scheme 'B' with Parallel Regen Units

2
1
L1
L2
L3
PE
1 Main line fuse UL class J
2 Main line contactor
2a Regen contactor 2)
3 Regen line fuse UL class J
4 HF fi lter (optional)
1) KEB recommends using fast acting class J fuses only (ex. Bussman type JKS). For applications with KEB Harmonic Filters and an isolation
transformer, a high speed class J fuse must be used (only Ferraz type HSJ is approved).
2) Current sharing between the R6-S and the frequency inverter must be taken into consideration during motor (supply) operation. The current
sharing is dependent on the uk value (voltage drop across the choke) and the nominal current of the line choke. If too much current fl ows
through the R6 unit, a second R6 unit should be used in parallel with the fi rst.
3) The regenerative contactor may only be closed if the pre-charging of the DC bus circuit of the inverter is completed. A relay output on the R6
unit can provide the control for this contactor. See Section 4.5.1.
4) A line choke with minimum Uk=3 % is required for all inverters equal to or greater than size 23. Additionally a line choke is also recommended
in general to minimize circle current which can fl ow between the R6 unit and the frequency inverter during regen operation. This circle current
can reduce the available capacity of the R6 unit by 10-25% depending on the value of the choke connected to the inverter and the commutation
choke.
5) If the inverter current is greater than the current of one COMBIVERT R6, the DC bus conductors from the inverter must be connected to an
external terminal block to split the current to multiple R6 units. In this case the conductors to each R6 unit must be at least 6 AWG (10 AWG for
the size 15R6) or larger based on the DC bus current to each unit.
6) Due to tolerances in the inductance values of the regen choke, the actual available power of each R6 unit must be reduced by 15% to account
for unequal load sharing. Therefore the total power available is reduced. With parallel connection of different sized R6 units, it is necessary to
use the same choke in order to maintain the same short circuit voltage (uK) across the chokes.
7) The regen CAT5 synch cables must plug into the same synchronization module. It does not matter which X2B ports are used on the module.
Wiring Scheme B should only be utilized with R- and U-Housing F5 Elevator Drives. The
drive housing is indicated in the part number's seventh digit (e.g. xx.F5.A1H-xxxx,
xx.F5.A1R-xxxx, xx.F5.A1U-xxxx).
Sizings with harmonic fi lters must utilize Wiring Scheme A (Sections 4.4.2 and 4.4.3) and
should only be used in combination with harmonic fi lters from KEB.
4
3
L1 L1'
L2 L2'
L3 L3'
2a
4
3
L1 L1'
L2 L2'
L3 L3'
10
4
L1 L1'
L2 L2'
L3 L3'
10
5 Commutation choke
1)
6 Inverter line choke
7 COMBIVERT R6-S
8 Frequency Inverter
1)
7
X2B X2B ++
5
++
L1.1 L1.2 L12
L2.1 L2.2 L22 - -
L3.1 L3.2 L32 PE - -
X2B X2B ++
5
++
L1.1 L1.2 L12
L2.1 L2.2 L22 - -
L3.1 L3.2 L32 PE - -
6
PE ++
+PA
L1
8
- -
L2
-
L3
PE
9
9
2) 4) 7)
10 External terminal block
2) 4)
6)
7
10
Motor
5)
US - 21