© EA Elektro-Automatik GmbH & Co. KG , DE-41747 Viersen , Helmholtzstr. 31-33 , TEL. 02162-3785-0, FAX. 02162-16230
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Technical description
General
The laboratory power supply series PS3000B is an ideal equipment for the use in R&D , schools (vocational training), maintenance
and production. The attractive design, the easy and intuitive handling and the rugged and reliable technology make this series an
ideal tool for technicians, engineers and their apprentices.
Adjustment of the output
Output voltage and output current can be set from 0 up to the max. value. Both operation modes, constant voltage (CV) or constant
current (CV), are selected automatically (auto crossover).
Load connection
The load can be connected through the safety sockets on the front or via screw terminals on the rear side.
Remote sense
The output voltage loss resulting from long DC output cables can be compensated by connecting the sense terminal (+ and – sense)
on the rear side with the + and – input terminals of the load. For this purpose please remove the jumpers from the ter
Sense and – Sense firstly.
Overvoltage protection (OVP)
The units are equipped with an overvoltage protection (OVP). The value can be adjusted with a screw driver between 0V...110% of
the rated output voltage. If the output voltage becomes higher than the preset value, due to a user’s mistake or an internal defect,
the output will shut down and the LED OVP will light up.
Fan control and overtemperature protection (OT)
The series is equipped with a temperature regulated fan speed. In case the temperature of the transformer or the power stage
becomes too high, the output is switched off automatically. The LED OT (overtemperature) will light up. After cooling down the unit
will reset automatically.
Interfacing
The built-in analogue interface allows to control the unit externally through analogue signals (0-10 V)
With the external, optional interface UTA12 it is possible to control the unit via a personal computer. The software for this application
(UTA12) is provided.
Pin assignment analogue interface
Internal schematic diagram analogue interface
The grounds of the unit (AGND and DGND) are electrically connected to the positive output!
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Name
VSEL
CSEL
VREF
DGND
SEL-enable
OT
NC
NC
VMON
CMON
AGND
+VCC
Standby
OVP
CV/CC
I/O
I
I
O
-
I
O
-
-
O
O
-
O
I
O
O
Description
Nominal value voltage
Nominal value current
Reference value
Ground
Select local / extern
Overtemperature
-
-
Actual value voltage
Actual value current
Ground
Supply voltage
Output on / off
Overvoltage
Voltage or current control
Description, level, impedance
0…10V, input impedance >40k
0…10V, input impedance >40k
10V Imax.5mA
Ground for control and status signal
Umax. 20V, Imax.2mA, U low <1V
Umax. 20V, Imax.-25mA, Open Collector
-
-
0...10V, Imax.2mA
0...10V, Imax.2mA
Ground nominal and actual value, VREF
11...15V, Imax.100mA
Umax. 20V, Imax.2mA, U low <1V
Umax. 20V, Imax.-25mA, Open Collector
Umax. 20V, Imax.-25mA, Open Collector
Phasing
Low=Extern
Low=OK
Low=Off
Low=OK
Low=CV
Open=Local
Open=Error
Open=On
Open=Error
Open=CC