Repair
Repair Price: $ 624.00
Purchase
CSL Part Number: 35163
Product Overview: The Varispeed R400 (also sold as Danfoss) is a 2 HP DC motor control drive designed to regulate armature voltage and current for DC motors in industrial applications. It accepts AC input power (configurable for 115V or 220V) and provides adjustable DC output, typically up to 90V or 180V armature voltage at 10A current. Commonly used in paper processing equipment and other machinery requiring precise speed control, it operates in velocity mode with adjustable minimum/maximum speed and current limiting.
Category: DC Motor Controls
Manufacturer: Graham
Manufacturer Synonyms: Graham Transmissions, GRAHAM MOTORS AND CONTROLS
Alternate Manufacturer Names: DANFOSS
Manufacturer Part Number: 176B4000
Series: VariSpeed R400
Other Synonyms: DANFOSS
Common Failures
This product commonly experiences issues with defective components such as capacitors, Zener diodes, and resistors. Physical damage, including lifted pads and burnt traces, has also been observed. In some cases, operational amplifiers have caused voltage supply issues that affect repairability.
Repair Approach
Repairs typically involve inspecting and replacing defective capacitors, diodes, output FETs, and resistors. Circuit board trace repairs are performed by installing jumper wires where needed. Minor burnt areas are cleaned and protected as part of the repair process.
Testing & Quality
Products undergo thorough testing to verify functionality. This includes burn-in tests with motor operations and waveform output checks using an oscilloscope. Jumper settings are verified for correct operation before use. In cases where repair is not possible, the customer will be updated with available options.
Service and repair your broken Graham part
We can repair your Graham model 176B4000 in our facility. Let our skilled technicians get your Graham back in operation quickly.
Step 1 - Click the green 'Repair Now' button above to add the part and then complete the RMA.
Step 2 - The RMA form will be sent to you via email. Print the RMA form and put it in a box with the item(s) for repair.
Step 3 - Ship or mail the box to the address listed on the RMA.
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