16
Intended Use
The laboratory power unit is a combination of direct current power unit and safety variable isolating trans-
former with alternating current output. The device can be set up as a table device or integrated into rack
systems.
The DC voltage source is used for operating low-voltage consumers. A variable output with adjustable
voltage and current and a fixed voltage output with fixed current limitation are available. Connection is
possible on the front and rear alike.
The AC variable isolating transformer serves as galvanic separator for work on grid-voltage powered
electrical devices. The AC output voltage can be adjusted infinitely.
When switching the DC outputs of several DC power units in series, voltages of >75 V/DC, which are dan-
gerous to contact, may be generated. At the AC output, voltages of >50 V/AC can be generated accor-
dingly. Starting at these voltages, insulated lines/measuring cables must be used for safety reasons.
DC connection on the front is performed with 4 mm safety sockets, on the rear with socket screw
connectors. The outputs (front and back) are connected to each other.
The AC output is connected through a potential-free socket without grounding contact. For measuring
purposes, suitable measuring adapters must be used.
Only 1 device at a time may be connected to the AC output. Never use any multiple
outlets, since the grid voltage can be transferred to the other devices through the
grounding contact in case of an error. Danger to life!
Unisolated lines or open contacts must be avoided under all circumstances. Danger
of electrical shock when touching two live conductors!
The connection cables used must be large enough. Where the conductor section is
too small, overheating and fire may result.
The output data is as follows:
Output 1 “DC OUTPUT”
0 - 30 VDC, 0 - 5 A
Output 2 “5V/3A”.
5 VDC max. 3 A
Output 3 “AC OUTPUT”
0 - 250 VAC max. 4.5 A (max. 1125 VA)
The voltage and current on output 1 and current on output 3 can be set infinitely variable through the
rotary control. The values are displayed on the respective LC displays.
The device is overload- and short-circuit-protected. The alternate voltage output is protected by a cir-
cuit breaker.
The laboratory power unit is designed in compliance with protection class 1. It is only approved for
connection to shockproof sockets with protective grounding and an alternating current of 230V/AC
commonly used in households. All outputs are potential-free.
Operation is impermissible under unfavourable ambient conditions. Unfavourable ambient conditions are:
- moistness or high humidity
- dust and combustible gases, vapours or solvents
- thunderstorms or similar conditions such as strong electrostatic fields etc.
Any use other than that described above will damage the product and may involve other risks, such as
short-circuit, fire, electric shock, etc. Do not change or modify any part of the product!
The safety instructions must be observed under all circumstances!
