I have a Simco HL-320 with a Fanuc 0T-A and when I press the power button a second time to power up everything the Z axis moves in the -Z direction as long as I hold the button. The hydraulic pump also comes on as long as I hold the button. It all stops when I release the button. I do not think the axis should move and the hydraulic pump should stay on. Any ideas where I should start looking?

I've checked all my fuses. Could a bad encoder cable cause the axis to run away on power up?