Derating Guidelines
TeSys island standard starters, SIL* starters, and power interface modules are designed for operation without derating under the following conditions:
-
Horizontal mounting position
-
Ambient temperature up to 50 °C (122 °F)
For vertical mounting or ambient temperatures above 50 °C (122 °F), apply the derating values in the following table to the load rating requirements. If both derating conditions apply, then you must apply both derating factors. Derating is calculated by the digital tools.
Derating Guidelines for Mounting Position and Ambient Operating Temperature
| Derating Condition | Derating Factor |
|---|---|
|
Mounting position |
20% derating required in the vertical mounting position |
|
Ambient operating temperature |
2% derating per °C of temperature rise above 50 °C (122 °F), with a maximum of 60 °C (140 °F) |
The derating conditions apply to all standard starters, SIL starters, and power interface modules. The derating conditions do not affect short-circuit protection devices.