Working documentation

This page is generated from the project's working notes. It records a real retrofit in progress, corrections included. Anything marked 🔴 or ⚠️ is unresolved or carries a caveat - read those before acting.

Power distribution and earthing

2 September 2026. From wiring diagram sheets 1 (COLL. TERRE), 2 (I.G. + POTENZA), 3 (TRASFORMATORI AUX) and 4 (ALIM. AZIONAMENTI).

Incoming: 400 V 50 Hz, 60.3 A, 41.8 kVA, line 4 x 10 mm2, IN = 40 A, ID = 0.1 A.

Sheet 2 - main isolator and motor loads

L1 L2 L3 N to -QM1, Telemecanique V4, 80 A, with door lock KZ-74 and extension shaft, giving R1 S1 T1.

Load	Breaker	Set at	Contactor	Rating
-M101 drills motor (MOTORE PUNTE)	QF101 4-6.3 A	4 A	KM101	1.5 kW, 4 A
-M601 vacuum pump (POMPA VUOTO)	QF601 17-23 A	18.5 A	KM601L/T/Y star-delta	7.8 kW, 18.5 A, 1450 rpm

🔴 All ten drill spindles are driven by one 1.5 kW motor. OF.9 OF_MOT_PUNTE_VERT is simply that motor's contactor; OF.10-OF.15 and OF.25-OF.28 are the pneumatic spindle selects. Worth knowing before anyone plans per-spindle speed control.

The drills motor lands at =BM+X5 on terminals -D 27/28/29 and -X5 U1/V1/W1; the pump at =BM+X3.

Sheet 4 - drive supplies

Drive	Breaker	Set at	Contactor	Supply
-UX (X, SGDH-15DE)	QFX GV2-ME10 4-6.3 A	4.6 A	KMX	400 V direct
-UY (Y, SGDH-10DE)	QFY GV2-ME07 1.6-2.5 A	1.6 A	KMY	400 V direct
-UZ (Z, SGDH-10DE)	QFZ GV2-ME07 1.6-2.5 A	1.6 A	KMZ	400 V direct
-U560 (carousel, Panasonic)	QF560 GV2-ME10 4-6.3 A	5 A	KM560	220 V from -T1

🔴 The Panasonic runs on 220 V, fed through -F1/-F2/-F3 (6 A AM) into -T1, a 3 kVA three-phase transformer, 400 to 220, then QF560 and KM560. The three Yaskawas run direct off 400 V.

Each axis therefore has both a dedicated breaker and a dedicated contactor. Dropping KMX/KMY/KMZ is an existing, wired way to kill an axis in hardware, which is useful for the retrofit safety design.

Sheet 3 - auxiliary transformers and control voltages

Transformer	Primary	Secondaries	Feeds
-T2 (700 VA)	0-400	0-110 V, 500 VA and 0-18 V, 200 VA	110 V control circuits; 18 V to the DC bridge
-T3 (1500 VA)	0-400	0-220 V, 1250 VA and 0-24 V, 250 VA	220 V rail; 24 V AC to the CNC
-T1 (3 kVA)	380-400-420 (Y)	220 (D)	Panasonic drive, sheet 4

Protection: -F7/-F8 2 A AM on the T2 primary, -F9 2 A AM on 110 V, -F10 6 A GL on 18 V, -F11/-F12 4 A AM on the T3 primary, -F15 6 A GL on 220 V, -F13 6 A GL on 24 V, -F14 1 A GL.

The CNC supply

T3 secondary 0-24 to -F13 (6 A GL) to wires 9 and 10, landing on -CNC pins 1 and 2, labelled ALIMENTAZIONE C.N. The connector is the 5-pin CN5P (025TEC0009); pins 3, 4 and 5 are drawn but not obviously used.

The Tecnos takes 24 V AC on pins 1 and 2, protected by a 6 A GL fuse.

The 24 V DC rail

-G3 (Cabur CS6 24/90-264, 6 A) is fed N/L from the 220 V winding and produces the DC rail on wires 12 and 014. On the drive sheets, 014 lands on the drive's 24V terminal and 12 on 0V, so 014 is the positive and 12 the return. ✅ Confirmed 2 Sep by SGM page 6, which lists CONN.X pin 7, wire 014, going to -UX:24V. The numbering is counter-intuitive but correct.

An unregulated DC supply also exists: 18 V from T2 through -F10 into -G2 (Zaniboni bridge, 25 A 400 V) with -R1 1 kohm 5 W and -C1 22000 uF 63 V, giving wires 7 and 8 out to the =BM terminal groups.

Other loads on sheet 3

• -M4 cabinet fan (Fendis 250x250, 110 Vca) and -M5 brake-resistor fan (Superflow 120x120), both on 110 V
• -XS1, ALIM. PC - a 3-pin socket off the 220 V winding. This is the outlet the rp5800 is plugged into.

Sheet 1 - earthing

Two bars: BARRA DI TERRA QUADRO ELETTRICO (cabinet) and BARRA DI TERRA BORDO MACCHINA (machine), linked by G51, G52, G53 at 6 mm2 to terminal groups -X4, -X43 and -X5.

Cabinet bar conductors worth knowing:

Conductor	To
G1	Line entry
G31-G38	Component plate, uprights, doors, roof, side panels
G39-G46	Connectors A, B, C, D (two each)
G4/G5	T2 carcass and secondary 0 V
G6/G7	T1 carcass and screen
G8/G9	T3 carcass and secondary 0 V
G14	G2 bridge
G17	Inverter
G18, G19, G20	UX, UY, UZ - each drive earthed individually
G22	U560 Panasonic
G26	M601 pump motor
G12	ALIM. PC

The transformer screens and each drive having its own earth conductor matter for the analog wiring under Option B. Keep that scheme.

Related

• device-list.md - part numbers for every device above
• spindle-vfd.md - the inverter's own supply and control wiring
• tecnos-io-rack.md - the controller and its 24 V AC feed