Siemens 6SE7086-4AH85-1BA0 Dimensioning of the burden resistors, Changing fuses

Maintenance 01.03

8.2Dimensioning of the burden resistors

Average DC current		A	1300	1500	1950		2100	2660	2850
Burden voltage for 100%		V				1
	R75, R76	Ω	39	33	27		27	18	18
Burden resistors *)	R77, R78	Ω	39	33	27		33	22	18
	R79, R80	Ω	390	680	150		51	110	150

*) on module C98043-A1685 or C98043- A1695 in the case of parallel units

Notes

The maximum power loss is 37 mW at 18 W. The resistors have an output of 300 mW.

Replacement boards are supplied without burden resistors, i.e. the original burden resistors must be unsoldered for boards which replace defective boards.

Location of the burden resistors and fuses

		X47						X29
			X19
2				1	3	2	1
	R 76
	R 78
	R 80
			F4	7A T 25 0V

F3 7A T 25 0V

C98043-A1685

R 79

R 77

R 75

X48

25 0V	25 0V	25 0V
2A T	2A T	2A T
F5	F1	F2

1

X 9

5

X 9

8.3Changing fuses

The fuses have been mounted in the factory with the indicator pointing to the outside of the unit. This must be borne in mind when a fuse is being changed.

8-2	ENGLISH	Siemens AG 6SE7086-4AH85-1BA0
	Common rectifier and rectifier/regenerating units with water cooling	Supplement to the operating instructions