JUMO 709051, Operating Manual, Page: 34 / 92

3 Electrical connection
34 V1.00/EN/00741192/2021-03-30 [IPC 300]
3.3.6 Calculation of the EMI filter current
Example A 3000 W heating rod is to be operated at 90 V and 33.3 A with a power con-
troller type 709051/X-XX-0
70 ... in a 230 V mains supply. This results in the fol-
lowing application power loss according to the formula:
P
Loss max
is taken from the table on power loss in Chapter 2.3 "Environmental
influences" and amounts to (for our application with connection to 230 V):
450 W.
With a mains current of 14 A, an EMI filter with a nominal current of 16 A is
used.
maximum load power consu P
Loss
Voltage supply for power section
I
Mains
= I
Filter
=
1 1 š
-PTT -PTTNBY
*
"QQM
*
SBUFE
*
-PBEDVSSFOUPOOBNFQMBUF
SBUFE
*
-PBEDVSSFOUPGUIFBQQMJLBUJPO
"QQM
1
1PXFSMPTT UIBUBSJTFTPO
-PTT
'JMUFS$IPLFBOEJOTJEF*1$
P
Loss
= 450 W ×
P
Loss
= 214 W
70 A
33.3 A
3000 W (heating load) + 214 W
230 V (voltage supply to the power section)
I
Mains
=
I
Mains
=
14 A