Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors

VFD Quick Start Guide

Crane Pumps & Systems
Crane variable speed frequency drives Quick Start Guide

VFD Quick Start Guide

Using variable speed/frequency drives on wastewater pumps can be tricky, but if the drives are sized and programmed properly, they can be very useful tools.

1. Ensure the motor data in the VFD settings matches the pump being used. Incorrect data within the VFD can result in incorrect turndowns, insufficient torque, or other issues which would result in clogging or damage to the pump.

2. Properly set the overloads within the VFD. Overload settings should never exceed 140% of Full Load Amps, as per NEC. These should be set as high as possible to prevent nuisance tripping during chopping, but also make sure local codes are followed. Using 10-15% above Full Load Amps is a good starting point.

3. Set your minimum turndown at 75% of the pump speed (45 Hz). Our chopper pumps chop best when they run at higher speeds. To avoid clogging, run as close to the standard pump speed as possible. Ensure your speed is sufficient to open the check valve.

4. Set your ramp up and ramp down times to be as short as possible. Note that all VFDs have inherent current limits. Be sure to balance your ramp up time with the inrush current so that your overloads do not trip on startup, while still keeping the ramp up time as low as possible. We recommend 5 seconds or less, and to never exceed10 seconds.

5. Make sure the drive is sized for and set for constant torque. Most drives have an automatic tuning option that matches the motor characteristics to the drive, and varies the settings as needed to keep constant torque. This automatic tuning does cause the recognition issues between the VFD and pump when a spare pump is installed, so it is not recommended in all applications.

6. Where possible, use a torque boost setting.

Read more about Operating Chopper Pumps With Variable Frequency Drives!

Related Articles

Related Whitepapers

True-turbine Design Enhances Energy Recovery and CO2 Reduction

In the oil and gas industry, hydraulic power recovery turbines (HPRTs) capture energy in hydrocrackers that would otherwise be wasted to efficiently drive a charge…

5 Steps for Reliable Packing Performance

These guidelines will help extend packing life and reduce downtime. No shortcuts should be taken if a plant wants to achieve reliable compression packing performance.…

Pressure Testing of DFT® Check Valves [Infographic]

All DFT Check Valves undergo rigorous tests to ensure they meet industry quality requirements. Check out this handy infographic to learn about their diligent testing.

Bearing Protection Best Practices

Electro Static Technology (EST, AEGIS®) guarantees that AC induction motor bearings will not fail from electrical fluting damage when AEGIS Shaft Grounding Rings have been…

Comments

Leave a Reply

Your email address will not be published. Required fields are marked *

Join the #PumpTalk Community


By submitting this form, you are consenting to receive marketing emails from: Empowering Pumps & Equipment, 2205-C 7th Street, Tuscaloosa, AL, 35401, http://www.empoweringpumps.com. You can revoke your consent to receive emails at any time by using the SafeUnsubscribe® link, found at the bottom of every email. Emails are serviced by Constant Contact