8M DC AutoDoor - Troubleshooting Guide - CHC

Introduction

The DC Auto Door uses a pneumatic cylinder to push the drive wheel onto the door.

A 12 volt motor drives the wheel CW and CCW to open or close the door.

The machine uses a timer to open the door (parameter 1404) and the door closed sensor to stop the motor when closing the door.

An internal spring in the cylinder raises the assembly up when the solenoid shuts off.

Symptom Table

Symptom	Possible Cause	Corrective Action
Auto Door not engaging, wheel is turning.	There is a problem with the solenoid or contamination in the cylinder.	Troubleshoot the solenoid, inspect the air hose and cylinder.
Auto Door engages but wheels do not turn.	The Door or the DC motors are jammed.	If the DC motors are jammed it will cause the 12VDC power supply to shut down. Verify that the Door or DC motors are not jammed.
	There is a problem with the auto door 12VDC power supply.	Check the AD power supply, 120 VAC input, 12 VDC output. The power output can drop if the power supply senses a large load, this is normal. Check for door jams or binding in the motors.
	There is a problem with the 8M PCB.	Inspect the relays and connections.
The door does not fully open.	Chip build up in the door rollers or coolant contamination on the auto door wheel.	Clean the chips away from the door rollers. Clean the coolant from the auto door wheel.
Setting 131 Auto Door is On. When pressing the Auto Door button on the side of the pendant, or when commanding a M80 on MDI. A message "Feature Disabled" appears on the screen or alarm 548 DOOR M CODES NOT ALLOWED.	The factory setting 823 [823:] Auto Door Type is set to 0.	Make sure factory setting 823 [823:] Auto Door Type is set correctly: 5 = Single DC Motor Auto Door 6= Dual DC Motor Auto Door

Input Voltage Inspection

Corrective Action:

Measure the voltage on the AD power supply [1]. Verify the 120 VAC input and 12 VDC output.

Measure the voltage at P2 on the 8M PCB [2]. Use a multimeter with needle-tip probes. The voltage must be 12 VDC.

Note: Do not measure the voltage with the cable disconnected.

If the voltage is not correct, measure the voltage at P35 for CHC or P18 for NGC on the PDIST PCB. The voltage must be 12 VDC. If the voltage is correct, cable 860 is at fault. If the voltage is not correct, troubleshoot the PDIST PCB.

If the voltages are correct and 12 VDC is going to the motor but it does not rotate, the motor may have failed. The motor should read 6-12 Ohms of resistance.

Relay Inspection

Corrective Action:

Refer to 8M PCB - Troubleshooting Guide

Solenoid

Corrective Action:

Manually activate the auto door solenoid. If the assembly does not lower then check the hose for leaks or binding in the cylinder.

With the auto door commanded on, check for 120 VAC at the solenoid.

Note: Do not measure the voltage with the cable disconnected.

Auto Door Settings / Parameters

Setting	Description	Usage
131	AUTODOOR	This setting enables/disables the auto door

Parameter	Description	Usage
251	AUTO DOOR OPEN ERROR TIME	This specifies the time allowed for the motor to run to open the door. After this an alarm is generated.
823	AUTO DOOR TYPE	The auto door type (type 5 = non-servo auto door)
1404	AUTO DOOR OPEN HOLD TIME (MS)	This specifies the time that the DC motor is on to open the door.
1405	AUTO DOOR CLOSE HOLD TIME (MS)	This specifies the time that the DC motor remains on after the door closed switch is sensed. .
1406*	AUTO DOOR OPEN OUTPUT	The auto door open M-code relay output number.
1407*	AUTO DOOR CLOSE OUTPUT	The auto door close M-code relay output number.
1408*	AUTO DOOR ENABLE OUTPUT	The auto door engage solenoid output number.
1409*	AUTO DOOR OPEN INPUT	This parameter is not used. There is no door open switch, the control looks at parameter 1404 time to open the door.

Note: *These parameters are only available on a Classic Haas Control with Lathe software version 11.26 or higher.

Electrical Diagrams

CHC Auto Door Electrical Diagram

Note: Only Classic Haas Control Lathes were built with a non-servo autodoor.