Stober SD6 - Calculating the Derating; Effect of Installation Altitude; Effect of Surrounding Temperature; Device Features

ID 442426.04 33WE KEEP THINGS MOVING
Technical data
4
Manual SD6
4.2.2.5.2 Effect of surrounding temperature
Derating depending on the surrounding temperature is determined as follows:
• 0 °C to 45 °C: no restrictions (D
T
= 100 %)
• 45 °C to 55 °C: Derating -2,5 % / K
Example
The drive controller will be operated at 50 °C.
The derating factor D
T
is calculated as follows
D
T
= 100 % - 5  2.5 % = 87.5 %
4.2.2.5.3 Effect of installation altitude
Derating depending on the installation altitude is determined as follows:
• 0 m to 1000 m above sea level: no restriction (D
IA
= 100 %)
• 1000 to 2000 m above sea level: Derating -1.5 % / 100 m
Example
The drive controller will be installed at an altitude of 1500 m above sea level.
The derating factor D
IA
is calculated as follows:
D
IA
= 100 % - 5  1,5 % = 92.5 %
4.2.2.5.4 Calculating the derating
Follow these steps for the calculation:
1. Determine the highest clock frequency (f
PWM
) that will be used during
operation and use it to determine the nominal current I
2N,PU
.
2. Determine the derating factors for installation altitude and surrounding
temperature.
3. Calculate the nominal output current I
2N,PU
according to the following
formula: 
I
2N,PU
= I
2N,PU
 D
T
 D
IA
A drive controller of type SD6A06 will be operated at a clock frequency of 8 kHz
at an altitude of 1500 m above sea level and an surrounding temperature of
50 °C.
The nominal current of the SD6A06 at 8 kHz is 3.4 A.
The derating factor D
T
is calculated as follows:
D
T
= 100 % - 5  2.5 % = 87.5 %
The derating factor D
IA
is calculated as follows:
D
IA
= 100 % - 5  1.5 % = 92.5 %
The output current to be observed for project configuration is:
I
2N,PU
= 3.4 A  0.875  0.925 = 2.75 A
4.3 Device features
If you order a drive controller with accessory parts, the weight is increased as
follows:
• Communication module: 50 g
• Terminal module: 135 g
Protection class of the
device
IP20
Protection class of the
control cabinet
At least IP54
Radio interference
suppression
EN 61800-3, interference emission class C3
Overvoltage category III to EN 61800-5-1
Size Weight
Without packaging [kg] With packaging [kg]
0 2,53 3.52
1 3.7 5.47
2 5.05 6.49
3 13.3 14.8