HEIDENHAIN PWM 20: 4 Installation

Operating Instructions

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PWM 20

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3.2 Installation location NOTICE

Damage to the device may result from incorrect

placement.

Always position the device horizontally.

Place the device in a location where it is easily

accessible during operation.

Ensure sufficient ventilation.

Do not block the vents on the rear and side panels or

impair airflow.

The device features a temperature-controlled

fan, which is activated if the maximum internal

temperature is exceeded and deactivated when

the temperature has cooled down sufficiently.

For information on the installation position, see "C" on the

front fold-out page.

4 Installation

NOTICE

Risk of damage to internal components!

Do not engage or disengage any connecting elements

while the product is under power.

Depending on the product's equipment, the

installation may differ from the procedure

described in this chapter. If the Addendum

included with the product contains information

on the installation, the information given in

the Addendum takes precedence over the

information in this chapter.

The illustrations of pin layouts always show

the pin assignments of the connections on the

product, and not of the connectors.

The safety of any system incorporating the

use of this product is the responsibility of the

operator of the system.

PWM 20

Operating Instructions

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4.1 Product overview

Front panel

See "A" on the front fold-out page.

X1

15-pin D-sub input for HEIDENHAIN en-

coders with

11 µA

PP

/25 µA

PP

 interface 1 V

PP

/3 V

PP

 interface  (1 V

PP

/Z1, 1 V

PP

 with limit positions, 1 V

PP

 with clock/data) EnDat/SSI interface TTL interface with limit positions HTL interface (connection only for ser- vice purposes via external adapter, e.g. ID 1093210-01) Fanuc, Mitsubishi, Yaskawa, or Panasonic interface

X2

15-pin D-sub output for feed-through mode

of the encoder signals from X1

X3

6-pin mini-DIN connection for external func-

tions

X4

8+2-pin RJ-45 connection for encoders with

a DRIVE-CLiQ interface

L1

Status display for operating readiness

Off: Not ready

On (green): Ready

L2

Status display for encoder supply

Off: Encoder supply switched off

On (green): Encoder supply switched on

Rear panel

See "B" on the front fold-out page.

1

Power switch

X5

USB Type B socket (USB 2.0), data interface

X6

Power connection

4.2 Connecting the line voltage WARNING

Risk of electric shock!

Improper grounding of electrical devices involves a risk of

serious injury or death by electric shock.

Always use 3-wire power cables.

Make sure the ground wire is correctly connected to

the ground of the building's electrical installations.

WARNING

Fire hazard from the use of power cables that do not

meet the minimum requirements!

Use only power cables that fulfill or exceed the

specified minimum requirements.

Use the supplied power cable to connect the power

connection X6 to a 3-wire grounded power outlet.

For information about the location of the power connection

on the rear panel, see "Rear panel", page 23.

For signal assignment of the power connection X6, see "R".

4.3 Electrostatic discharge NOTICE

This product contains components

that can be destroyed by electro-

static discharge (ESD).

It is essential to observe the safety

precautions for handling ESD-sensiti-

ve components.

Never touch connector pins without

ensuring proper grounding.

Operating Instructions

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PWM 20

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4.4 Connecting encoders NOTICE

Danger of damage to the device and encoder damage

due to incorrect voltage supply range and incorrect

wiring!

Note the voltage supply range of the connected

encoder.

Check whether the cable between the encoder and

device is correctly wired.

The cable between the encoder and the device must

not be connected or disconnected while under power.

The connection and operation of the device with

encoders that are not from HEIDENHAIN is the user‘s

own risk.

Connections

Encoders with a 15-pin interface are connected to

encoder input X1 on the front panel.

When connected to the control loop, encoder output X2

is used for encoders with a 15-pin interface.

Encoders with 8+2-pin DRIVE-CLiQ interfaces are

connected to encoder input X4 on the front panel.

For information on the location of the connections, see

"Product overview", page 23.

The pin layouts of the connecting cables are described in

the catalog.

Notes on the signal assignment of the pins in the

annex:

Cable shield connected to housing; 

U

P

 = Power supply

Sensor: The sensor lines are connected

internally with the corresponding voltage

supply, depending on the settings in the

ATS software ("ATS Software Operating

Instructions" document, see "Notes on reading

the documentation", page 18).

EnDat/SSI interface Pin Function

1, 3, 7, 9, 11, 14

Incremental signals (only with ordering

designations EnDat 01 and EnDat 02)

2, 4, 10, 12

Voltage supply

5, 8, 13, 15

Position values

6

Internal shield

For signal assignment of EnDat/SSI, see "F".

Fanuc, Mitsubishi, Yaskawa, or Panasonic interface Pin Function

1, 3, 7, 9, 11, 14

Incremental signals (if available, only

for adjusting; do not use in normal ope-

ration)

2, 4, 10, 12

Voltage supply

5, 8, 13, 15

Position values

6

/

For signal assignment of Fanuc, see "G".

For signal assignment of Mitsubishi, see "H".

For signal assignment of Yaskawa and Panasonic, see "I".

Fanuc and Mitsubishi: Do not use pins 5 and 13

for one-pair transmission.

1 V

pp

 / 3 V

pp

 interface Pin Function

1, 3, 7, 9, 11, 14

Incremental signals

2, 4, 10, 12

Voltage supply

5, 6, 8, 13, 15

Other device-dependent signals 

(switched internally)

For signal assignment of 1 V

pp

 with limit positions, see "J".

For signal assignment of 1 V

pp

/Z1, see "K".

For signal assignment of 1 V

pp

 with clock/data, see "L".

11 µA

pp

 / 25 µA

pp

 interface Pin Function

1, 3, 7, 9, 11, 14

Incremental signals

2, 4

Voltage supply

5, 6, 8, 10, 12, 13, 15

/

6

Internal shield

For signal assignment of 11 µA

pp

 (25 µA

pp

), see "M".

PWM 20

Operating Instructions

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TTL interface (with limit positions) and HTL interface Pin Function

1, 3, 7, 9, 11, 14

Incremental signals

2, 4, 10, 12

Voltage supply

3, 13, 15

/

6, 8

Limit signals

(if supported by the encoder)

For signal assignment of TTL and HTL, see "N".

Connection X4

For signal assignment of DRIVE-CLiQ, see "P".

Encoder output X2

The encoder input X1 of the device is electrically connected

with the encoder output X2. The signals and the pin layout

at the output correspond to the respective signals at the

input (signals are picked off or actively emulated).

There is no galvanic isolation of the signals. The supply and

sensor lines are switched via the ATS software as of version

V2.6 depending on the respective mode of operation and

may be connected (see examples below). It is always

ensured that the supply voltage generated by the device is

not present at X2.

Example 1 

–

 Device in feed-through mode (the encoder is

powered by the subsequent electronics) / ATS software not

started.

Example 2 

–

 The device powers the encoder via X1:

Connecting the encoder cables

Connect the cables of the encoders tightly to the

respective connections.

If the cable connectors include mounting screws, do not

overtighten them.

Do not subject the plug connections (encoder input X4)

to mechanical load.

Vacant pins or wires must not be used.

4.4.1 Grounding conditions when connected to the control loop

The device has an internal wide-range switching power

supply. The PE terminal (protective earth), which is also

connected with the housing of the device, is therefore

required. If the device is integrated in the control loop

of an NC-controlled machine, it constitutes an additional

grounding point, which changes the shielding concept.

The following measures can be taken to prevent this:

Supply the device via an isolating transformer, or

Supply the device with 24 V DC

To evaluate the measuring data of the device, a PC is

connected to the device's USB interface. The 0 V potential

and the protective earth terminal are usually connected to

each other in the PC (also USB). If the device is integrated in

the control loop of an NC-controlled machine, the conditions

on the 0 V connection change, too.

The following measures can be taken to prevent this:

Use a battery-operated laptop as PC, or

Use a laptop with a power supply unit without protective

earth terminal