DC Modules
The DC module is the drive side of the SCR house — it takes the driller's throttle & assignment commands & turns them into controlled DC power at the drawworks, the mud pumps, & the rotary table. ETSCO supplies replacement DC modules & module components for legacy (Ross Hill & Hill Hayes) style drive systems.
One SCR bay may serve several masters in a drilling day — drawworks on a trip, a mud pump on bottom — & it is the DC module that makes each assignment behave: ramping the bridge, holding current limit, & protecting motor & thyristors alike.
SCR bridge firing & drive regulation
Drawworks, mud pumps, & rotary table
Current limit & drive interlocks
What the DC module does
In an analog SCR house, each powered bay carries a DC module that closes the loop between the driller & the motor. The module receives the throttle reference from the driller's console, compares it against armature current & voltage feedback, & fires the SCR bridge at exactly the angle that delivers the speed the driller called for — no more, no less. Current limit inside the module is what lets a driller lean on the brake handle without cooking a 752 style motor or clearing a fuse; the interlocks are what keep an unassigned bay dead until it is wanted. When a module fails, the bay goes with it, & the rig runs short-handed until the chassis is replaced.
Ordering replacement DC modules
ETSCO supports
- Complete DC module chassis
- DC slide assemblies & slide PCBs
- Current & power limit boards
- Feedback & auxiliary boards
- Module meters, switches, & chassis hardware
Contact ETSCO to confirm current support for your drive module chassis.
Send with your RFQ
- System family & the cubicle or bay identity
- Module legend, type, & revision as printed
- The assignments the bay serves
- Motor data where known (752 style, ratings)
- Symptoms observed & clear photographs
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