Repair
Repair Price: $ 624.00
Purchase
CSL Part Number: 14119
Product Overview: The Danfoss VariSpeed R400 (model 176B4000) is a 2 HP DC motor control drive designed to regulate speed and torque of DC motors in industrial applications. It provides adjustable DC voltage output (0-180VDC) with armature current control for paper processing, material handling, and general industrial machinery. The drive features configurable minimum/maximum speed settings, current limiting, and bidirectional motor control. It operates from standard AC line input and delivers smooth, precise speed regulation through SCR-based power conversion.
Category: DC Motor Controls
Manufacturer: Danfoss
Alternate Manufacturer Names: GRAHAM
Manufacturer Part Number: 176B4000
Series: VariSpeed R400
Other Synonyms: GRAHAM
Common Failures
Frequent failures include shorted zener diodes, defective integrated circuits, burnt resistors, lifted pads, and open or burnt traces. In some cases, units may be found Beyond Economic Repair due to issues such as supply loading or voltage irregularities that persist after component replacement. Additionally, shorted silicon-controlled rectifiers have been identified as a common issue in certain product versions.
Repair Approach
The repair process typically involves checking capacitors, diodes, output field-effect transistors, and resistors. Circuit board repairs may include installing jumper wires to address open traces and applying conformal coating for minor burnt damage. Mechanical adjustments may include calibrating speed and current limit potentiometers to achieve proper output specifications.
Testing & Quality
Products undergo testing to verify functionality. This includes burn-in tests with motors, waveform output verification, and operation under different load conditions to confirm stability. Units are re-evaluated and adjusted as needed to meet CSL quality standards.
Service and repair your broken Danfoss part
We can repair your Danfoss model 176B4000 in our facility. Let our skilled technicians get your Danfoss 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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