HEIDENHAIN PWM 20 - Manual (Page 31)

32 HEIDENHAIN ATS Software User's Manual
Procedure:
1. The PWM 20 encoder output (OUT) must not be connected!
2. Connect the absolute encoder to the PWM input (IN) using a suitable adapter cable,
connect the ATS software by hand and note down the encoder ID displayed at the
lower right (see “Setting up a connection to the encoder”).
3. Disconnect the ATS from the encoder.
4. Use the appropriate testing cable to connect the PWM 20 output (OUT) to the control
(which is switched off) for feed-through mode.
5. Connect the ATS software automatically with the ID that was displayed before.
Reason: The terminating resistors of the PWM 20 encoder output (OUT) block the measuring
function of the ATS.
If the PWM 20 output (OUT) is used for manual connection, the transfer function of absolute
encoders is blocked.
DANGER
Integrating the PWM 20 into the control loop influences the supply voltage
and grounding conditions (see Installation and commissioning instructions,
ID 729905-91).
The feed-through function must be handled with great care and caution!
No persons are allowed within the working range of the machine!
Ensure that vertical axes cannot fall down!
Do not disengage any connecting elements during the measurement!
Move the machine axis to the middle of the traverse range before you connect the
PWM 20!
When you have connected the PWM 20 into the control loop of the machine, check
whether the axis concerned can be traversed in a controlled manner.
One operator must be at the EMERGENCY STOP switch to make sure that the
machine can be switched off at any stage of this "setup phase"!
Possible axis behavior caused by grounding problems:
- Uncontrolled machine movement
- Machine switches off (EMERGENGY STOP)
- Machine axis drifts
- Machine axis traverses at rapid traverse
Note
Observe the safety precautions in the PWM 20 Operating Instructions
(ID 1125089-90).
HEIDENHAIN recommends running the feed-through mode with floating supply with the
service adapters SA 100 / SA 110.