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Extra information for ...Max – size M
► Power input depending on supply voltage
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.
Rated current in acc. with motor running time
Voltage
Current
40 s
24 V DC
I
1,5 A
Nominal
120 V AC
I
0,26 A
Nominal
240 V AC
I
0,13 A
Nominal
► Cross sections of the inlet 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 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.
[ V ]
U
V
1 mm²
28
27
26
25
24
23
22
21
20
50
100
150
Example:
24 V power supply with wire diameter 1.5 mm² = cable length 126 m
Schischek GmbH Germany, Muehlsteig 45, Gewerbegebiet Sued 5, 90579 Langenzenn, Tel. +49 9101 9081-0, Fax +49 9101 9081-77, E-Mail info-de@schischek.com
60 s
90 s
120 s
150 s
1,0 A
0,8 A
0,7 A
0,7 A
0,18 A
0,14 A
0,12 A
0,12 A
0,09 A
0,07 A
0,06 A
0,06 A
1,5 mm²
2,5 mm²
200
250
300
350
www.schischek.com
I [ A ] /
Inrush pulse / power
P [ W ]
Operating current / power (see table left)
0
Pannel
Line cross section „A" [mm²]
Voltage
„U
" [V]
V
Required cable cross section A at existing cable length L
A = 0,0714 × L : (U
Example: L = 250 m, U
Cross section A = 1,5 mm²
4 mm²
Maximum cable length L at existing cross section A
L = A × (U
Example: A = 1.5 mm², U
Length of cable L = 126 m
For calculation following characteristics are essential:
U
= supply voltage [V]
V
A
= line cross section [mm²]
L
= conduit length [m]
400
Factor 0.0714 = drive specific factor [ Vmm²/ m ]
L [ m ]
E X P L O S I O N P R O O F
Quiescent current/holding power
Terminal box Actuator
Line length „L" [m]
− 18 V)
V
= 30 V
V
− 18 V) : 0,0714
V
= 24 V
V
(based on the electrical conductivity of
electrolytic copper with a coefficient of 56 m /Ωmm²)
t [s]
info-Max-M_en
V01 – 26-Mar-2015
5 / 6
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