The Speed-range ratio for Drives is 20:1, 100:1 or 1000:1. This is an indication of how slow the Drive can run the motor, before the motor starts to overheat.
Drive with a 1000:1 ratio is good, as compared to 20:1 or 100:1.
The Altivar 61 and Altivar 71 Range of Drives have the Speed-range ratio of 1000:1 in closed loop and 100:1 in open loop operation.
Example:
The speed in RPM (Revolutions per Minute) of a 4 pole, 50 Hz Motor will be 1500 RPM.
If the Drive Speed-range is 1000:1, Drive can run the motor as slow as 1.5 RPM (1500/1000 = 1.5) without overheating.
For 100:1 it is 15rpm and for 20:1 it is 75rpm.
The higher the Speed-range ratio, the slower the motor can be operated safely without overheating.
Released for: Schneider Electric Saudi Arabia
Need help?
Product Selector
Quickly and easily find the right products and accessories for your applications.
Get a Quote
Start your sales enquiry online and an expert will connect with you.
Where to buy?
Easily find the nearest Schneider Electric distributor in your location.
Help Centre
Find support resources for all your needs, in one place.
