MMAW NC II case studies
MMAW NC II · Put your knowledge to work in context.
Mechatronics Servicing NC II is a Philippine TVET qualification under TESDA that certifies a worker to install, configure, maintain, and troubleshoot automated production equipment that combines mechanical, electrical, electronic, pneumatic, and control elements. It suits maintenance technicians, machine builders, assembly-line electricians, and instrumentation staff who already work with or want to move into automated manufacturing, packaging, water treatment, or process plants. The MMAW NC II case studies are 5 cases and about 4,654 words.
1Sluggish, Jerking Reject Pusher on Packaging Line 3
The reject pusher on packaging line 3 is a double-acting cylinder (32 mm bore, 400 mm stroke) driven by a 5/2 single-solenoid valve, with speed set by two meter-out flow control valves. Standard extend time is 1.2 s; it now takes 2.4 s and moves in jerks, and the operator reports a hiss near the valve exhaust.
957 words, about 5 min2Intermittent NO BOTTLE Alarm on a Filling Machine
An 8-head filling machine uses a PLC with 24 VDC input cards. The bottle-present sensor at station 4 is a three-wire PNP photoelectric type wired to input X12 through a 28 m cable that shares a tray with the 3-phase motor feeders for the conveyor.
897 words, about 4 min3Hot Inspection Room and an H7 Bearing Bore
Forty bearing housings have a bore specified Ø30.000 to Ø30.021 mm (H7). The inspection room has no air conditioning and reads 31 °C; the machine shop where the parts were cut reads 26 °C.
864 words, about 4 min4Hydraulic Hose Failure, Floor Spill, and a Storm Drain
The hydraulic power unit for a 100-tonne press holds 200 L of ISO VG 46 mineral oil. During the night shift the suction hose between the tank and the pump starts weeping; by morning about 15 L has dripped onto the machine base, the floor, and into the drip tray.
969 words, about 5 min5Motor–Pump Alignment After a Bearing Replacement
After a bearing replacement, a 15 kW, 2-pole (2970 rpm) centrifugal pump and its motor were re-coupled with an elastomeric coupling. Vibration at the motor drive-end bearing is 8.2 mm/s RMS overall, with a strong 2× running-speed component (99 Hz) and axial vibration of 4.1 mm/s.
967 words, about 5 min