User Manual

Page 31
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
PSB 9000 2.5 kW Series
2.3.5 Connection to DC loads or DC sources
• In the case of a device with a high nominal current and hence a thick and heavy DC connec-
tion 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.
• Connection to and operation with transformerless DC-AC inverters (for example solar in-
verters) is restricted, because the inverter can shift the potential of negative DC pole against
PE(ground).Mindthemax.allowedpotentialshift(seetechnicalspecications)!
• Due to the construction, the device will always draw a small current of ≤0.1% I
Nom
when
beingconnectedtoanexternalsourceandwhiletheDCinputisswitchedo󰀨!
No false polarity protection inside! When connecting sources with false polarity the device
will be damaged, also when not powered!
The DC terminal is on the back side of the device and isn’t 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 1.5 m (4.9 ft) and average ambient temperature up to 50°C (122°F), we recommend:
up to 30 A: 6 mm² up to 70 A: 16 mm²
up to 90 A: 25 mm² up to 120 A: 35 mm²
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.
2.3.5.1 DC terminal types
The table below shows an overview of the various DC terminals. It’s recommended that connection of load cables
alwaysutilizesexiblecableswithringlugs.
Type 1: Models up to 360 V Type 2: Models from 500 V
M8 bolt on a metal rail
Recommendation: ring lug with a 8 mm hole
M6 bolt on a metal rail
Recommendation: ring lug with a 6 mm hole