4.7.2 Checking Fuses
There are up to 11 fuses that make up the system on the bed mills. There are 2 fuses in the pendant, 3
fuses on the spindle control module and 6 fuses on the power module. The SMX2500 does not have a
spindle control module.
To check fuses:
1. Use a Volt/Ohmmeter; select “OHM”.
2. Remove the fuse completely from the pendant, electrics box or cable breakout box.
3. Place a lead of the meter on each end of the fuse.
A good fuse reads 0 (zero) or close to it.
A bad fuse reads Open or infinity.
4.7.3 Cable Breakout Box Connections
This module is located on the back side of the machine (inside the electrical cabinet for SMX 3500, 4000
and 5000). It consists of 3 motor connections, 3 limit-switch connections, 3 encoder connections, a door
guard connection, volts free contacts for the coolant pump and spindle control and an indexer outlet.
4.7.4 Cable Connections
The SMX machines use 10+ cables to communicate between systems. It is often the case that what
appears to be the failure of an electrical component is actually attributable to a poor connection.
Indications:
Control problems, chronic or intermittent.
Motor problems
Measurement problems
Explanation:
1. Turn off and isolate the supply to the machine.
WARNING!
Do not plug and unplug connectors with the system power on. This may cause damage to the
connector board and harm to the technician.
2. Visually inspect the connections for excessive debris, moisture, or obvious damage.
3. Carefully clean any swarf away from the connectors.
4. One-by-one, take out each connector and then plug them back in. Do the same at the
computer/display.
5. Make sure to tighten up the screws on each of the connectors.
4.7.5 Electrical Box – SMX 3500, 4000 & 5000
The electrical box is made up of the following main components:
1. AC drive – used to control the spindle motor.
2. 3 braking resistors – used to brake the spindle motor. To verify the resistors are good, measure
the resistance across B1 and B2 of the AC drive. The resistance should read 33 ohms. Values
lower or higher than this could mean one or more resistors are bad.
3. Transformer (400 volt to 110 volt).
4. Control contactors for spindle and coolant pump, fuses and E-stop safety relay.
5. Spindle control module - controls the auxiliary signals from the pendant to the AC drive and
electrical outlets.
a. Power Outlets:
i. Non-Estopped: for pendant and worklight
ii. E-stopped: For lube pump, spindle fan, electrical cabinet fans and spare (use for
indexer for example).
b. Diagnostic LEDs: The following explains the LED lights on the spindle control board.
There are two banks of 10 LEDs on the board. Not all of the LED’s are used.
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