Stober SC6 Series User Manual

STOBER 5 | Technical data
05/2019 | ID 442790.01
37
5.1.3.2 Effect of the surrounding temperature
Derating as a function of 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 needs to be operated at 50°C.
The derating factor D
T
is calculated as follows
D
T
= 100% − 5 × 2.5% = 87.5%
5.1.3.3 Effect of the installation altitude
Derating as a function of the installation altitude is determined as follows:
§ 0m to 1000m: No restriction (D
IA
= 100%)
§ 1000m to 2000m: Derating −1.5%/100m
Example
The drive controller needs to 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%
5.1.3.4 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 reduced nominal current I
2N,PU(red)
in accordance with the following formula:
I
2N,PU(red)
= I
2N,PU
× D
T
× D
IA

Stober SC6 Series Specifications

General

Brand	Stober
Model	SC6 Series
Category	Controller
Language	English