A VFD or DC drive review can slow down over a few practical questions. Which kit fits the application? Which core configuration belongs on a DC drive? How does a measured bearing current compare with the allowable value?
The new MH&W — Power Quality Tools & Specs app puts those checks in one place on iPhone and iPad. It combines three application tools with product documents and direct links to MH&W support.
No account or sign-in is required. Once the app is installed, its core selectors, calculator, and bundled reference documents work offline. Web, store, and email links still require the appropriate connection or service.
Start with the question you need to answer
1. Build a VFD kit recommendation
The VFD Kit Selector asks for three inputs:
- VFD horsepower
- Cable distance in feet
- Conductors per phase
Based on those values, the app returns a recommended kit and shows the common-mode chokes, differential-mode chokes, and any additional components included for that configuration.
This makes the selector useful when preparing an application review or organizing information for a quotation. The recommendation should still be considered alongside the complete installation, especially when the system has unusual operating conditions or information is missing.
2. Select a core configuration for a DC drive
DC drive applications have their own path. The DC Drive Core Selector uses:
- DC drive horsepower
- Cable distance in feet
- Conductors per polarity
The result identifies the common-mode and differential-mode core configuration associated with the entered values. Keeping this workflow separate makes it clear which conductor information the user needs to collect before starting.
3. Evaluate a bearing-current measurement
The Bearing Current Calculator addresses a different question. Users enter the drive-end bearing size, opposite-drive-end bearing size, and measured peak current in amps from a Rogowski-coil reading.
The calculator compares the entered measurement with the listed maximum allowable bearing current and returns a PASS or FAIL result. The result can also be sent through the device’s email app, making it easier to document or share the calculation.
The app does not take the current measurement, and a PASS or FAIL result is not a certification of the entire motor system. Accurate inputs and measurement context still matter.
Keep product information close to the calculation
The app’s Resources area includes CoolBlue®, NaLa®, and CoolTube® datasheets and guides. It also connects users to additional eBooks, technical papers, white papers, and case studies on the MH&W website.
Quick links lead to the MH&W website, online store, and sales email. That keeps the next step close to the calculation, whether the user needs to check a document, review available products, or ask an application question.
Designed for work near the equipment
The information needed for a selection is not always waiting in a desk file. Horsepower may come from a nameplate, cable distance may need to be checked at the installation, and bearing-current work begins with a measurement taken at the motor.
Because the core tools work offline, users can bring the workflow closer to the equipment after installing the app. Record the values entered along with the result so another person can follow the same path later. That short record is also useful when the application moves to MH&W for review. It shows what the recommendation or calculation was based on instead of leaving only a screenshot of the result.
What to gather before opening the app
- Decide whether the question concerns a VFD kit, a DC drive core configuration, or a bearing-current measurement.
- Record the horsepower and drive-to-motor cable distance for selector work.
- Confirm conductors per phase for a VFD or conductors per polarity for a DC drive.
- For bearing-current analysis, record both bearing sizes and the measured peak current from the Rogowski-coil reading.
- Do not estimate missing information. Contact MH&W when the application needs a closer review.
Put the toolkit on your iPhone or iPad
Download MH&W — Power Quality Tools & Specs from the Apple App Store. Gather the application values first, choose the appropriate selector or calculator, and use the result to begin the next conversation.
