Siemens 6RA70 specifications Ambient temperature Reduction in base drive dc ampere rating

Notes:

1)Operation with reduced input voltage will result in reduced maximum output voltage accordingly.

2)Values apply for rated DC output current on both the armature and field circuits.

3)The specified output DC voltage can be guaranteed up to an undervoltage of 5% of rated line voltage.

4)The table below gives load values, (DC current), as a function of ambient temperature surrounding the Base Drive Panel, (refer to P077). Note, Important: When Base Drive Panels are installed into enclosures, make sure the temperature inside does not exceed 45oC, otherwise derate the DC current rating per the table below.

Ambient temperature	% reduction in base drive dc ampere rating
	Self-cooled converters	Fan-cooled converters
	(15, 30, 60, 100 ADC)	(140 - 1660 ADC)
+40ºC	– 0 %	– 0 %
+45ºC	– 0 %	– 0 %
+50ºC	– 6 %	– 5 %	a)
	– 11 %	– 5 %	a)
+55ºC
	– 18 %	– 5 %	a)
+60ºC

a)Operation of fan cooled units at ambients above 50oC is not permitted because of limitations on the allowable fan operating temperature.

5)Load values, (DC current), as a function of installation altitude (refer to P077)

%	b1
100
Percentage
load "b"
80
60				67%
40
20
0
1000	2000	3000	4000	5000 m
			Installation altitude

Curve b1: Reduction factor of load values, (DC current), at installation altitudes above 1000 m.

No derating of the supply voltages to any circuits is required up to an installation altitude of 5000 m for basic insulation.

5-4	Siemens Energy & Automation
	SIMOREG DC Master Base Drive Panel Operating Instructions