© EPS Stromversorgung in 2022, this information is subject to change without notice
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30000800_manual_psb_10000_4u_30kw_en_04
2.3.6
Connection to DC loads or DC sources
• In the case of a device with a high nominal DC current and hence a thick and heavy DC connection
cable it’s necessary to take account of the weight of the cable and the strain imposed on the DC
connection. Especially when mounted in a 19” cabinet or similar, where the cable could hang on the
DC terminal, a strain reliever should be used.
• Besides the proper cross section of DC cables the proper electric strength (withstand voltage) of
the cables must be considered.
No false polarity protection inside! When connecting sources with false polarity the device will be
damaged, also when the device isn’t powered!
When connected to DC, an external source charges the internal capacities on the DC terminal, even
when the device isn’t powered. Dangerous voltage levels can be present on the DC terminal, even
after disconnection of that external source.
The DC terminal is located on the rear side of the device and is
not
protected by a fuse. The cross section of the connection
cable is determined by the current consumption, cable length and ambient temperature.
For cables
up to 5 m
(16.4 ft)
and average ambient temperature
up to 30°C (86°F)
, we recommend:
up to
40 A
:
6 mm² (AWG8)
up to
60 A
:
16 mm² (AWG4)
up to
80 A
:
25 mm² (AWG3)
up to
120 A
:
35 mm² (AWG1/0)
up to
180 A
:
70 mm² (AWG2/0)
up to
240 A
:
2x 35 mm² (AWG1/0)
up to
420 A
:
2x 95 mm² (AWG3/0)
up to
1000 A
: 3x 185 mm² (AWG400)
per connection pole
(multi-conductor, insulated, openly suspended). Single cables of, for example, 70 mm² may be replaced
by e.g. 2x 35 mm² etc. If the cables are long then the cross section must be increased to avoid voltage loss and overheating.
2.3.6.1
DC terminal types
The table below shows an overview of the various DC terminals. It’s recommended that connection of DC cables always
utilizes flexible cables with ring lugs.
Type 1: Models up to 200 V
Type 2: Models from 360 V
M10 bolt on a metal rail
Recommendation: ring lug with a 11 mm hole
M6 bolt on a metal rail
Recommendation: ring lug with a 6.5 mm hole
