Specifications

Southwestern Industries, Inc.

ProtoTRAK SMX K2, K3, K4 & Retrofit Safety, Installation, Maintenance, Service & Parts List Manual

3. 2 braking resistors – used to brake the spindle motor. The mechanical brake should not

be used to brake the spindle. To verify the resistors are good, measure the resistance

across B1 and B2 of the AC drive. For 3 HP machines it should read 60 ohms and for 5

HP machines it should read 32 ohms. Values lower or higher than this could be one or

both resistors are bad.

4. Relay – used to turn on and off the lube pump and spindle motor fan.

5. Spindle control PCB board - controls the auxiliary signals from the pendant to the AC

drive and electrical outlets. The following explains the LED lights on the spindle control

board. There are (2) 10 LED segments on the board. Not all of the LEDs are used. See

figure 21 for an illustration.

10 LED Segment

4. LED labeled Gear 1 – this light should be on whenever the machine is in low gear. LEDs

labeled Gear 2 thru Gear 4 are not used.

5. LED labeled SPD-FAULT – this light will be on whenever the AC drive is in a fault

condition, which includes an E-stop message from the pendant.

6. LED labeled SPD-RUN – this light should be on whenever the spindle is on.

7. LED labeled SPD-ENABLE – this light should be on whenever you are in DRO, tool setup

and RUN mode.

10 LED Segment

1. LED labeled E-STOP OUT – this light should be on whenever the E-stop is in the out

position. When the E-stop is pressed, this light should go off.

2. LED labeled LATCH RELAY – this light should be on when the spindle is running or if the

spindle is not running and the fwd/rev switch is in the off position when in DRO, tool

setup or RUN mode. Note – if spindle won’t turn on and the spindle is enabled and the

e-stop is out, then either the fwd/rev switch is bad or the spindle control board is bad.

3. LED labeled TAP MODE – light should be on whenever you are not tapping. Light will be

off when in the tap event. Not applicable to 2-axis knee mills or retrofits.

4. LED labeled TAP REVERSE – this light will be on when the spindle changes direction at

the bottom of a tap event and back off after the spindle changes direction once outside

of the tap event. Not applicable to 2-axis knee mills or retrofits.

5. LED labeled REV-RELAY – when fwd/rev switch is in reverse this light will be on. Note –

this does not mean necessarily that the spindle will be running this direction.

6. LED labeled FWD-RELAY – when fwd/rev switch is in forward this light will be on. Note –

this does not mean necessarily that the spindle will be running this direction.

7. LED labeled Z-LIMIT PLUS – this light will be on only when the Z-axis plus limit switch is

triggered. This only applies to a 3

axis product.

8. LED labeled Z-LIMIT MINUS – this light will be on only when the Z-axis minus limit switch

is triggered. This only applies to a 3

axis product.