NORDAC SK 750E Manual
42
Technical design subject to change
BU 0750 GB
3.3.4 Standard I/O custom interface
(SK CU1-STD, part no.: 278200020)
The Standard I/O custom interface (
C
ustomer
U
nit) affords a num-
ber of control terminals sufficient for the majority of applications
plus a RS485 interface.
One analogue differential input and 4 digital inputs are provided to
control the frequency inverter. The analogue input is capable of
processing signals in the range between 0 and 10V or 0/4...20mA
repsectively (owing to a burden resistor which can be connected
into the circuit).
The analogue output enables current operating parameters to be
retransmitted to a read-out device unit or to a process control sys-
tem. The output signal is scalable and can be provided in a range
between 0 and 10V.
The two relay contacts can be used to transmit an alarm signal to
another system or to control a brake.
The RS485 interface can be used to control and parameterize the
frequency inverter connected to it from a PC. The NORDCON
software will be required to ensure this function. When parameter
setting has been completed the entire data record can be saved to
memory as a file.
Note:
More details available in chap. 7.6, Parameter P400
Connectorr
Functions
Maximum cross section
Parameter
X1.1
Output relay
1.5 mm
2
P434 ... P443
X1.2
IN / OUT analogue signals
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 related to a common reference potential!
The potentials AGND /0V and GND /0V of the various devices are interconnected.
Maximum allowable current load of the 5/15V power sources combined = 300mA!
Floating contact or
output of an SPC: 7.5...33V
(low = 0...3,5Volt)
Differential input 0...10V
0/4...20mA
Supply voltage: 5V
RS485 (USS protocoll)
5V power supply for Parameter-
Box,
p-box
or motor PTC
(switching threshold=2.5V, to
any of the digital inputs)
Digital inputs:
DIG IN 1 = enable right
DIG IN 2 = enable left
DIG IN 3 = parameter set bit 0
DIG IN 4 = fixed frequency 1
Output relays:
2.0A max.
28V DC /230V AC
U
REF
= 10V / I
max
= 10 mA
SPC analogue output: 0...10V
or potentiometer: 2...10k
Power supply: 15V
Terminating resistor for
RS 485 interface (120 )
Burden for 0/4...20mA anal. input
available for switching on (250 )
