4. Electrical Connections
• DOK-CONTRL-DDC+MDD+DLC-ANW1-EN-E1,44 • 01.97
31
Fig 4.8: Technical data and block diagram of a DEA
+U
ext
0 Vext
5K
12V 100nF
1/4 HEF40244
X17
Input
DC
DC
8
35
+12 V
0 V
TTL
16…32
Output
Tv
5K
SPDAE
1…15
UDN 2987A
I
L
I
ext
1) Free-wheeling diode integrated into load inductance in driver assembly.
1)
22k
0 Vext
Notes on loading
output signals
Out 0…15
Driver, UDN 2987 A, limits short-circuit currents to 350 mA.
If the short-circuit limit is active longer than 1
µ
s, then the
effected output will be locked (I
L
=0). The other outputs remain
functional. The effected outputs remain locked until the supply
voltage has been switched on and off once in rapid sequence.
If driver UDN 2987 A has switched off one or several outputs
because of overload, then the error will be displayed by the
switched on LED.
Notes on
LED ERR
Designation
Unit
min.
typical
max.
Supply voltage
+U
ext
V
18
24
32
Current consumption
I
ext
A
0.15
0.2
1)
2.2
2)
Inputs X17/1…15
+U
High
V
14
24
32
+U
Low
V
0
< 1
3
Outputs X17/16…31
+U
High
V
U
ext
-2
U
ext
-1
U
ext
+U
Low
V
0
1,6
2
I
L
mA
0
-
100
3)
1) Current consumption of 0.2 A without load at outputs of 24 V
2) Current consumption of 2.2 A loading all outputs with 100 mA ea.
3) Current at make for lamps must be limited by means of resistor
(e.g., 100 R) to 250 mA.
Technical data
DEA 4.1, DEA 5.1,
DEA 6.1,
IIlustration of
basic priniciple of
digital intput and
output circuitry