E X P L O S I O N P R O O F
L
[m]
50 100 150 200 250 300 350 400
28
27
26
25
24
23
22
21
20
U
V
[V]
1 mm²
1,5 mm²
2,5 mm²
4 mm²
L = A × (U
V
− 18 V) : 0,0714
A = 0,0714 × L : (U
V
− 18 V)
t
[s]
0
I
[A] /
P
[W]
40 s
60 s
90 s
120 s
150 s
1,5 A
1,0 A
0,8 A
0,7 A
0,7 A
0,26 A
0,18 A
0,14 A
0,12 A
0,12 A
0,13 A
0,09 A
0,07 A
0,06 A
0,06 A
www.schischek.com
Schischek GmbH
Germany, Muehlsteig 45, Gewerbegebiet Sued 5, 90579 Langenzenn, Tel. +49 9101 9081-0, Fax +49 9101 9081-77, E-Mail [email protected]
info-Max-M_en
V01 – 26-Mar-2015
Extra information for ...Max – size M
►
Cross sections of the inlet line
Pannel
Terminal box Actuator
Line cross section „A“ [mm²]
Voltage
„U
V
“ [V]
Example:
24 V power supply with wire diameter 1.5 mm² = cable length 126 m
For calculation following characteristics are essential:
U
V
= supply voltage [V]
A = line cross section [mm²]
L
= conduit length [m]
Factor 0.0714 = drive specific factor [Vmm²/m]
(based on the electrical conductivity of
electrolytic copper with a coefficient of 56 m/
Ωmm²)
Maximum
cable length L
at existing cross section A
Required
cable cross section A
at existing cable length L
Example: A = 1.5 mm², U
V
= 24 V
Length of cable L = 126 m
Example: L = 250 m, U
V
= 30 V
Cross section A = 1,5 mm²
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 dimensioned accordingly.
The accompanying formulas allow the calculation of the necessary line cross section
respectively maximal permitted conduit length respectively utilizing the existing line
cross section.
Alternatively the secondary voltage can be increased by selecting a transformer.
Rated current in acc. with motor running time
Inrush pulse/power
Operating current /power (see table left)
Quiescent current/holding power
►
Power input depending on supply voltage
Voltage
Current
24 V DC
I
Nominal
120 V AC
I
Nominal
240 V AC
I
Nominal
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 holding power is run time independently
typical at ~ 5 W. The power consumption for the heater is ~ 16 W. In the heating phase
the motor is not active!
The initial starting supply voltage required by the actuators power supply unit is ~ 2.0 A.
The starting pulse takes about 1 sec. (please consider this while concepting the cross
section of the supply line). The power factor is between 0.8 and 0.5 in dependence of
motor running time. A line protection should be min. 2 AT.
Line length „L“ [m]
5 / 6
