Window Master CompactSmoke WSC 104 - Formula for the Calculation of the Maximum Actuator Cable Length; Max Cable Length - ±24 V Standard Actuators; Max Cable Length - Actuators with Motorlink

10
8.2.1 Formula for the calculation of the maximum actuator cable length
Max. cable length = permissible voltage drop 2V (UL) x conductivity of copper (56) x cable cross section in mm
2
(a)
max. actuator current total in amps (I) x 2
For both ±24V standard actuators and actuators with MotorLink
®
the cross section of the cable must not be less than 0.75mm
2
regardless of the result of above formula.
Maximum actuator cable length: Always measured from the smoke to the last junction box
Permissible max. voltage drop in the line: 2 Volt
Actuating current: Sum of all actuator power consumption per motor line
Note: do not use the PE wire / green/yellow wire!
Example
Max actuator cable length with cable cross section 0.75mm
2
and actuator current 2A: (2 x 56x0.75) : (2 x 2) = 21m
8.2.2 Max cable length – ±24V standard actuators
The actuator supply cable must have 3 wires: 2 wires current carrying / 1 wire for monitoring.
±24V standard Actuators
Do not use the PE wire / green/yellow wire!
cable cross
section [a]
Total
actuator current [I]
3-wire
0.75mm²
3-wire
1.50 mm²
5-wire
1.50 mm²
2-wire
parallel
3-wire
2.50 mm²
5-wire
2.50 mm²
2-wire
parallel
3-wire
4.00 mm²
1A
42m
84m
168m
140m
280m
224m
2A
21m
42m
84m
70m
140m
112m
3A
14m
28m
56m
47m
93m
75m
4A
11m
21m
42m
35m
70m
56m
8.2.3 Max cable length – actuators with MotorLink
®
The actuator supply cable must have 3 wires: 2 wires current carrying / 1 wire for communication.
When a 5-wire cable is used for MotorLink
®
It is not recommended to use parallel wire.
ML-comm = MotorLink
®
communication
Furthermore, when using a 5-core cable, the
distance between ”–” and ”Com” must be the same
as the distance between ”+” and ”Com”.
Meaning if L2 e.g. is being used as ”Com” L1 and L3
must be used for ”+” and ”-”.