Power supply design
The design of the on-site supply, depends on the selected motor running time and selected
supply voltage. Accompanying values are "about values", since there can be construction
unit dispersions within electronics. The power consumption in the blocking position is run
time independently with max. 20 W. The power consumption for the heater is betwen 5
and 12 W. The heading is running only if the motor is in idle position! The initial starting
supply voltage required by the actuators power supply unit is around 2,0 A for about 1 Sec.
(Please consider this while concepting the cross section ot the supply line)
Dimensioning/Design of the supply line
On long distances between voltage supply and drive, voltage drops occur due to line
resistances. As a consequence with 24 VAC/DC the actuator receives a too low tension
and does not start. In order to prevent this, the cross section of the inlet line is to be
designed/dimensioned accordingly. The accompanying formula allows the calculation of
the necessary line cross section, perhabs provides the maximally permitted conduit length
utilizing the existing line cross section. Alternatively the secondary voltage can be increased
by selecting a transformer. For calcualtion purposses, following characteristics are essential:
UV = supply voltage in [V]
A = line cross section in [mm²]
L = conduit length in [m]
Factor 0.0714 = drive-specific factor
[Vmm²/m] ( based on the electrical conductivity of electrolytic copper with a coefficient of
56m/Wmm²)
pannel
length L [m]
terminal box
actuator
line cross section
A [mm²]
voltage
Uv [V]
Formula for max. cable length L at cable
cross section A
L = A
l
(Uv-18V) : 0,0714
Formula of needed cable cross section
A at a cable length of L
A = 0,0714
l
L : (Uv-18V)
The EL-S data sheet contains additional information for ExMax,
RedMax and InMax actuators of the size "S", for the optimization
and simplification in regard to planning, installation and initial startup.
It provides influences of external factors in reference to the safe
initiation of the actuators, as well as technical references and problem
solutions (error indication). With the error indication, functions can
be examined and different error/problems can be adjusted locally.
Example: A = 1,5 mm², Uv = 24 V
Lengthof cable L = 126 m
Example: L = 250 m, Uv = 30 V
Cross section of A = 1,5 mm²
Example:
24 V power supply with wire diameter 1,5 mm² = 126 m
Uv [V]
Rated current in acc. with motor running time
Voltage
Current
3/7,5s
15s
30s
60s
120s
240 V
I
nominal
0,5 A
0,1 A
0,1 A
0,1 A
0,1 A
120 V
I
nominal
0,8 A
0,3 A
0,2 A
0,2 A
0,2 A
48 V
I
nominal
2,0 A
0,6 A
0,3 A
0,3 A
0,3 A
24 V
I
nominal
4,7 A
1,3 A
0,7 A
0,6 A
0,5 A
Schischek GmbH
Germany, Mühlsteig 45, Gewerbegebiet Süd 5, 90579 Langenzenn, Tel. +49 (0)9101 9081-0, Fax +49 (0)9101 9081-77, E-Mail [email protected]
ExMax-.., RedMax-.., InMax extra information EL F1
E X P L O S I O N P R O O F
u
Power supply design
u
Design of line cross section 24...48 VAC/DC
u
Use at ambient temperatures down to -20°C / - 40°C
u
Error indication - problem treatment/solution
Power input depending of supply voltage
Dimensioning of the line cross section with 24 48 VAC/DC supply voltages
F1 extra information EL-S
For additional mechanical data have a look at extra information ME
28
27
26
25
24
23
22
21
20
50 100 150 200 250 300 350 400 L[m]
1 mm²
1,5 mm²
2,5 mm²
4 mm²
www.schischek.com
