Graham 176B4001 Varispeed R400 DC Motor Control 2 HP with Field
Repair
Repair Price: $ 624.00
Purchase
CSL Part Number: 25506
Product Overview: The Varispeed R400 DC Motor Control is a 2 HP drive manufactured by Graham (also known as Danfoss) that regulates DC motor speed and torque for industrial applications. It provides separate armature and field outputs, typically delivering adjustable DC voltage for precise motor control in paper processing and similar machinery. The unit features selectable current limits (via jumpers), voltage ratings up to 180V, and operates from 230V AC input power. Common configurations include forward/reverse control and adjustable speed regulation through SCR-based power conversion.
Category: DC Motor Controls
Manufacturer: Graham
Manufacturer Synonyms: Graham Transmissions, GRAHAM MOTORS AND CONTROLS
Alternate Manufacturer Names: DANFOSS
Manufacturer Part Number: 176B4001
Series: VariSpeed R400
Other Synonyms: DANFOSS
Common Failures
Our repair history indicates two predominant issues: inadequate voltage output and visible capacitor failure. These are frequently attributed to defective capacitors, with issues like high Equivalent Series Resistance (ESR) and physical damage.
Repair Approach
Repairs typically involve replacing defective components such as capacitors and SCRs. Missing fuses are added, and any corroded traces caused by leakage are repaired. Diagnostic tests are performed to verify component functionality, and non-functional components are replaced as needed.
Testing & Quality
Post-repair, units undergo comprehensive testing, including burn-in tests with standard motors and verification of operation modes like forward and reverse. These tests are designed to verify that repaired units meet expected operational conditions.
Service and repair your broken Graham part
We can repair your Graham model 176B4001 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.
Once the user has seen at least one product this snippet will be visible.