NORD Drivesystems BU0750 - Manual (Page 43)

3.3 Customer unit overview
BU 0750 GB-3311 Subject to technical amendments 43
3.3.4 Customer unit Standard I/O
(SK CU1-STD, Part No.: 278200020)
The standard I/O of the customer interface (Customer Unit)
provides sufficient control terminals for most applications and is
also equipped with an RS485 interface.
There are 1 differential analog input and 4 digital inputs available
for control of the frequency inverter. The analog input can process
signals from 0...10V or 0...20mA or 4...20mA (with additional
burden resistance).
The analog output allows actual operating parameters to be
transmitted to a display device or process control system The
output signal is scalable and is available in the voltage range
0...10V.
By means of the two relay contacts, a brake control can be
actuated or warnings can be transferred to another system.
The connected inverter can be controlled and parameterised with a
PC via the RS485 interface. NORD CON software is required for
this. Following successful parameterisation, the complete data set
can be stored as a file.
The digital inputs of the Standard I/O can also be assigned with
analog functions (see process controller, Section 10.3). Here, input
voltages ≥10V are processed as 10V signals and correspond to
100% (9V = 90%, ... , 0V=0%).
Connector Functions Maximum cross-section Parameter
X1.1 Output relay 1.5 mm
2
P434 ... P443
X1.2 Analog signals IN / OUT 1.0 mm
2
P400 ... P419
X1.3 Digital inputs 1.0 mm 2 P420 ... P423
X1.4 Bus signals / power supply 1.0 mm
2
P507 ... P513
74 RS485 -
X
1
.1
X
1
.2
X
1
.3
X
1
.4
11 VREF 10V
12 AGND /0V
13 AIN1 -
14 AIN1 +
17 AOUT1
21 DIG IN 1
22 DIG IN 2
23 DIG IN 3
24 DIG IN 4
42 VO +15V
41 VO +5V
40 GND /0V
73 RS485 +
01 REL1.1
02 REL1.2
03 REL2.1
04 REL2.2
NOTE: All control voltages are based on a common reference potential!
Potentials AGND /0V and GND /0V are internally linked in the device.
The maximum total current 5/15V is 300mA!
Floating contacts or
output of a PLC: 7.5...33V
(low = 0...3.5Volt)
Differential input 0...10V
0/4...20mA
Voltage supply: 5V
RS485 (USS Protokoll)
5V power supply for
ParameterBox, p-box
or motor thermistor (switching
threshold=2,5V, to any digital
input)
Digital inputs:
DIG IN 1 = On right
DIG IN 2 = On left
DIG IN 3 = parameter set bit 0
DIG IN 4 = fixed frequency 1
Output relay:
max. 2.0A
28V DC /230V AC
U
REF
= 10V / I
max
= 10 mA Analog PLC output: 0...10V
or potentiometer: 2...10k

Spannungsversorgung: 15V
Termination resistor for
RS 485 interface (120

)
Additional burden resistance for
0/4...20mA analog input (250

)
U/I switching
Analog input, 250

ON = Current,
OFF = Voltage
Termination
resistor
RS 485
120

OFF
ON
OFF
ON