Make sure the connectors for the P-COOL cable that connects through the connector bracket at the spindle head, and to P35 on the I/O PCB, are not contaminated and are properly seated. Check for damage to the cable. Run the program for 12 seconds. If the program is not working, reset the machine.
Run this program in MDI mode:
M34 G04 P1. ;
M35 G04 P1. ;
Find the connection for the P-COOL on the spindle-head connector bracket. While the program runs, use a multimeter with needle-tip probes to measure the voltage across pins 1 and 2, and pins 3 and 1. The voltage must measure 12 VDC. Do not measure the voltage with the cable disconnected.
If there is voltage, check for continuity in the cable between the P-COOL and the connector bracket. If there is no continuity, the cable is at fault. If there is continuity, the P-COOL assembly is at fault.
If there is no voltage, refer to: