Coiled Tubing Power Pack Unit & Control Cabin
The Power Pack or Power Unit supplies hydraulic power to the coiled tubing equipment unit. Most conventional units use a diesel engine (examples are Scania DN14 and Detroit 8V71 engines) to power hydraulic pumps, which in turn drive the hydraulic motors in the injector head, tubing reel, and well control systems. The engine is independent of rig power and air systems. As an alternative, electric motors may be used to drive the hydraulic power pack.
https://www.drillingmanual.com/coiled-tubing-power-pack-unit/