HEIDENHAIN PWM 8 User manual

Operating Instructions
Diagnostic Set
03/2003

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1. Contents
1. Contents ...................................................................................................................................................... 1
2. General Information....................................................................................................................................... 5
2.1 Safety Instructions................................................................................................................................. 5
2.2 Description of the PWM 8 Phase Angle Measuring Unit....................................................................... 5
2.3 Functions of PWM 8.............................................................................................................................. 5
2.4 Power Supply ........................................................................................................................................ 6
2.5 Items Supplied....................................................................................................................................... 6
2.6 Software ................................................................................................................................................ 7
2.7 Explanation of the Display..................................................................................................................... 7
2.8 Setting the Display Contrast................................................................................................................ 10
3. Operation..................................................................................................................................................... 11
3.1 Display after Power-On ....................................................................................................................... 11
3.2 Standard Soft-Key Row....................................................................................................................... 11
4. Description of the PWM 8 MODE................................................................................................................ 15
4.1 Switching the PWM 8 MODE .............................................................................................................. 15
4.2 PWM 8 MODE: UNIVERSAL COUNTER with Frequency Display .....................................................15
4.3 PWM 8 MODE: DETERMINE PULSE NUMBER with Frequency Display.......................................... 16
4.4 PWM 8 MODE: MEASURE U/I ........................................................................................................... 17
4.4.1 Display of the PWM 8 MODE: MEASURE U/I in the Mode Window........................................ 18
4.5 PWM 8 MODE: MEASURE AMPLITUDES .........................................................................................20
4.5.1 Measuring the Signal Amplitudes with 11µApp Interface Board: ............................................. 21
4.5.2 Measuring the Signal Amplitudes with 1Vpp Interface Board .................................................. 21
4.5.3 Measuring the Signal Amplitudes with TTL or HTL Interface Boards ...................................... 22
5. EXPERT MODE .......................................................................................................................................... 23
5.1 Activating the EXPERT MODE............................................................................................................ 23
5.2 Auxiliary Functions in the EXPERT MODE ......................................................................................... 23
5.2.1 The PRESET Editor ................................................................................................................. 24
5.2.2 The Parameters ....................................................................................................................... 25
5.2.3 Parameter Overview ................................................................................................................ 25
6. Practical Application .................................................................................................................................... 29
6.1 Power Supply of PWM 8 and Encoder................................................................................................ 29
6.1.1 Power Supply of PWM 8 and Encoder via DC-IN Socket ........................................................ 29
6.1.2 Power Supply of PWM 8 and Encoder via the Encoder Output (OUT) of the
Interface Board......................................................................................................................... 30
6.1.3 PWM 8 Power Supply via DC-IN Socket and Encoder Output (OUT) of the
Interface Board......................................................................................................................... 32
6.1.4 Voltage Monitoring Function of Encoder Supply......................................................................33
6.1.5 Block Diagram: PWM 8 Power Supply Unit .............................................................................35
7. Calibration ................................................................................................................................................... 36

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8. Specifications .............................................................................................................................................. 37
8.1 Pin Layouts of the Interface Boards .................................................................................................... 37
8.1.1 Pin Layout of the 11µApp Interface Board ............................................................................... 37
8.1.2 Pin Layout of the 1Vpp Interface Board ................................................................................... 37
8.1.3 Pin Layout of the TTL Interface Board .....................................................................................38
8.1.4 Pin Layout of the HTL Interface Board.....................................................................................38
8.2 Pin Layout of the Power Supply Socket on PWM 8 ............................................................................ 38
8.3 Specifications of PWM 8 Base Unit..................................................................................................... 39
8.4 Specifications of 11µApp Interface Board ........................................................................................... 40
8.5 Specifications of 1Vpp Interface Board ............................................................................................... 40
8.6 Specifications of TTL Interface Board ................................................................................................. 41
8.7 Specifications of HTL Interface Board................................................................................................. 42
8.8 Specifications of Power Supply Unit ................................................................................................... 42
9. Description of FST 2 Leak Tester................................................................................................................ 43
9.1 Explanation of the Controls and Displays ........................................................................................... 43
9.2 Example for Application....................................................................................................................... 44
9.3 Specifications of FST 2 ....................................................................................................................... 45
10. Description of ROD 450 Rotary Encoder .................................................................................................. 46
10.1 Specifications of ROD 450 ................................................................................................................ 46
11. Description of Connecting Cable 10-30V DC ............................................................................................ 46
12. Measuring Setup and Tolerances of the Output Signal............................................................................. 47
12.1 Description of the Output Signal ....................................................................................................... 51
12.1.1 Output Signals........................................................................................................................ 51
12.1.2 Output Signals........................................................................................................................ 52
12.1.3 Output Signals........................................................................................................................ 53
12.1.4 Output Signals........................................................................................................................ 55
13. Adapter Connectors .................................................................................................................................. 57
13.1 Overview of the Adapter Connectors ................................................................................................ 57
13.2 Adapter connector for exposed linear encode .................................................................................. 58
13.3 Adapter-connector for ERN 1387...................................................................................................... 59
14. Pin Layouts of Standard HEIDENHAIN Cables......................................................................................... 60
15. Description of the interface board, 1 Vpp, absolute (with Zn/Z1-track; EnDat/SSI;
SSI-programmable) ................................................................................................................................... 64
15.1 General information........................................................................................................................... 64
15.1.1 1 Vpp measuring systems with Zn/Z1 track .......................................................................... 64
15.1.2 1 Vpp measuring systems with EnDat interface.................................................................... 65
15.1.3 1 Vpp measuring systems with SSI interface and 5V supply voltage ................................... 65
15.1.4 1 Vpp measuring systems with SSI interface and HTL supply voltage................................. 66
15.1.5 1 Vpp measuring systems with programmable SSI interface................................................66
16 Items supplied ............................................................................................................................................ 67
16.1 Hardware........................................................................................................................................... 67
16.2 Adapter Cables overview .................................................................................................................. 67
16.3 Incremental Zn/Z1 ............................................................................................................................. 68
16.4 Absolute EnDat/SSI .......................................................................................................................... 69
16.5 Absolute EnDat/SSI motor encoder .................................................................................................. 70

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17 Software Description .................................................................................................................................. 71
17.1 Required software version................................................................................................................. 71
17.2 Selecting the encoders via soft keys................................................................................................. 71
17.2.1 Via the selection screen......................................................................................................... 71
17.2.2 Via parameter P9 in the EXPERT MODE .............................................................................. 71
17.2.3 Switching the AB and CD tracks for 1Vpp encoders with Zn/Z1............................................72
17.3 1 Vpp measuring systems with programmable SSI interface........................................................... 73
17.3.1 Activating the menu for additional functions........................................................................... 73
17.3.2 Switching the encoder supply to HTL..................................................................................... 74
17.3.3 Parameter P10 "sensor connection" with programmable SSI encoders................................ 75
18 Specifications: Interface Board 1Vpp, absolute.......................................................................................... 76
18.1 Encoder input (IN) ............................................................................................................................. 76
18.2 Encoder output (OUT)....................................................................................................................... 76
18.3 Signal assignment of the BNC sockets ............................................................................................. 76
18.4 Measuring encoder current/voltage................................................................................................... 76
18.5 Measuring signal amplitudes............................................................................................................. 76
18.6 Display of /UaS interference signal .................................................................................................. 76
18.7 Terminating resistors......................................................................................................................... 76
18.8 Pin layouts of drive encoders and absolute encoders....................................................................... 77
18.8.1 1 Vpp measuring system with Zn/Z1 track............................................................................ 77
18.8.2 1 Vpp measuring system with EnDat interface .....................................................................77
18.8.3 1 Vpp measuring system with programmed SSI interface .................................................... 78
18.9 Adapter kit for non-HEIDENHAIN wiring .......................................................................................... 79
18.9.1 Adapter kit 1 (Zn/Z1) for operation with Siemens and JH drives with
HEIDENHAIN Zn/Z1 encoders and non-HEIDENHAIN wiring................................................79
18.9.2 Adapter kit 2 (EnDat/SSI) for operation with Siemens drives with HEIDENHAIN
EnDat/SSI encoders and non-HEIDENHAIN wiring ............. 80
18.10 Adapter cables for direct connection of PWM8 to the PCB connector of the encoder .................. 81
18.10.1 Adapter cable with 12-pin PCB connector ........................................................................... 81
18.10.2 Adapter cable with 14-pin PBC connector ........................................................................... 82
18.11 Adapter cable 17/17-pin; PWM to motor (Pos.Enc.EnDat) ............................................................ 83
18.12 Adapter cable to IK 115 interface card........................................................................................... 84
18.13 Adapter cable 17/17-pin; PWM to motor (Mot.Enc.EnDat) ............................................................ 85
18.14 Adapter cable 17/17-pin; PWM to motor (Mot.Enc.EnDat) ............................................................ 86
18.15 Adapter cable 17/25-pin; PWM to subsequent electronics (Mot.Enc.1Vpp) .................................. 87
18.16 Adapter cable 17/25-pin; PWM to subsequent electronics (Mot.Enc.EnDat)................................. 88
18.17 Adapter cable 17/17-pin; PWM to motor (Mot.Enc.EnDat) ............................................................ 89

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2. General Information
2.1 Safety Instructions
Do not put defective units into operation!
1. 2.
0
I
Fig 1: Connecting the PWM 8 in the position control loop of a machine tool controlled by TNC
In order to correctly judge the problems in a machine tool controlled by TNC, fundamental knowledge of the
machine tool and its drives as well as their interaction with the measuring systems is required.
Inexpert handling may cause considerable damage and personal injury.
HEIDENHAIN is not liable for any damage or personal injury caused directly or indirectly or by improper use
or incorrect operation.
Warning: Do not change any parameters or encoder voltages at the PWM while the machine tool is
moving and a PWM is connected.
2.2 Description of the PWM 8 Phase Angle Measuring Unit
The PWM 8 phase angle measuring unit is a universal measuring unit for inspecting and adjusting
HEIDENHAIN linear and rotary encoders.
The unit is operated by means of 5 soft keys. All values are displayed in a graphics display field. For each of
the different encoder interfaces (11µApp, 1Vpp, TTL and HTL) a separate interface board is required. Each
interface board is equipped with an encoder input (IN) and an encoder output (OUT). The unaltered scanning
signals are available at the encoder output to be fed into e.g. a subsequent electronics. The PWM 8 may
also be connected in series between the measuring system and the subsequent electronics. The axis
functions of the machine tool are not impaired. It is also possible to use the PWM 8 separately for inspecting
and adjusting measuring systems.
2.3 Functions of PWM 8
The main functions of PWM 8 are:
• Display of phase angle and on-to-off ratio
• Display of the scanning frequency
• Measurement of signal amplitude, current consumption and supply voltage of the encoder
• Display of the internal universal counter or the signal periods of a rotary encoder (pulse count)
• Display of reference signal, fault detection signal and counting direction
• Output of the amplified scanning signals (interface board: 11µApp, 1Vpp) or the original scanning signals
(interface board: TTL, HTL) via 3 BNC sockets (e.g. to an oscilloscope)

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The following functions are available in the EXPERT MODE:
• Input of a preset for the internal universal counter
• Encoder voltage selectable
• Settings (e.g. dialogue language) programmable via parameters
2.4 Power Supply
Possibilities of powering PWM 8
• Line-powered via a separate 24V power supply unit (standard set)
• By an external, non-floating dc voltage source of 10 - 30 V / approx. 1 Ampere (adapter cable supplied
with PWM 8).
• Via the subsequent electronics; encoder, PWM 8 and subsequent electronics must be connected in
series (Caution: power consumption of PWM 8 approx. 5.5W).
The power supply of the measuring systems (external power supply unit or subsequent electronics) is
selected via the soft keys of PWM 8.
If a voltage is connected to the DC-IN socket of PWM 8, the PWM base unit is always operated with this
voltage.
If PWM 8 and/or the encoder are to be powered via the subsequent electronics,
• the encoder monitoring function of the subsequent electronics is active;
• it can be selected, how the encoder voltage of the subsequent electronics is fed to the encoder via
PWM 8:
1. directly to the encoder (via parameter: P2 in EXPERT MODE)
2. via the switching regulator (integrated in PWM 8) with potential segregation and possibility of setting
the encoder voltage.
2.5 Items Supplied
Diagnostic Set Items Id.No.
Id.No. 312 431 01 Id.No. 312 431 02
+ + PWM 8 309 956 ..
+ Option FST 2 251 697 ..
+ Option ROD 450 295 455 A1
+ + Power supply unit 313 797 ..
+ +
Power cord 240V∼223 775 01
+ + Adapter 10-30V DC 317 293 01
+ + BNC cable (3 pcs.) 254 150 02
+ + Connecting cable 9-pin 309 773-01
+ + Connecting cable 12-pin 298 399-01
+ + Operating instructions 312 737 ..
+ Option Interface board 11µApp 323 083 ..
Option Option Interface board 1Vpp 323 077 ..
Option Option Interface board TTL 323 079 ..
Option Option Interface board HTL 322 732 ..
Option Option Interface board Zn/Z1, EnDat,
SSI 312 186 .. 1)
1) Description of the Interface board Id. Nr. 312 186 .. in section 15.

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2.6 Software
For the PWM 8 phase angle measuring unit the following dialogues are available:
Dialogue Software - Id.No.
English / German 246 199-xx
English / French 246 200-xx
2.7 Explanation of the Display
Structure of the display
Information on the encoder
Measuring range and scaling of the PHA/TV display
PHA/TV display with peak hold
(here: maximum error: +TV2)
Display field for PWM 8 modes (here: UNIVERSAL
COUNTER and frequency display)
Soft-key row for operation
Current assignment of the BNC sockets
The following information is permanently displayed:
a): Information on the encoder:
Display: The supply voltage for the encoder is switched on.
Display: The supply voltage for the encoder is switched off.
Display: Reference signal
(no reference signal available)
The reference signal is displayed;
no real-time display of the reference signal!
Display: Fault detection signal
(no fault detection signal generated)
Fault detection signal generated, (active: low); at the same time
the fault detection signal memory (ERROR) is set.
No fault detection signal generated; the fault detection signal memory
(ERROR) has been set by an earlier fault.
The fault-detection memory can be deleted by:
1. activating another PWM 8 mode
2. switching the encoder voltage off and on
3. by pressing the soft key of the INFO soft-key row.
Display of the counting direction: Encoder moves in forward direction
Display of the counting direction: Encoder moves in backward direction
The last two places (xx) of the Id.No. represent
the software version.

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b): Measuring range and scaling of the PHA/TV display:
Definitions:
TV1, TV2 : On-to-off ratio incremental signal 1, incremental signal 2.
At the zero crossover analogue incremental signals are triggered, i.e. converted into square-wave signals.
One period (= on-time plus off-time of a square-wave signal) is subdivided into 360°.
If on-time and off-time of a square-wave signal are the same, i.e. 180° each (180° + 180° = 360°), the
on-to-off ratio is 0°. If the on-time of a square-wave signal exceeds the off-time, the on-to-off ratio is positive.
An on-to-off ratio of e.g. +10° means the on-time of the square-wave signal is 190° (180° + 10°) and the
off-time 170° (180° - 10°).
PHA: Phase angle error between incremental signal 1 and incremental signal 2.
If the incremental signal 1 leads the incremental signal 2 by 90°, the phase angle error is 0°. The phase
angle error is the deviation from the optimum phase shift of 90° dimensioned in degrees.
PHA/TV Display:
PHA and TV are displayed as bars. The scaling of the PHA/TV display can be set for different measuring
ranges.
With automatic switch-over of the measuring range the (graduated) range of the PHA/TV display is
automatically adapted to the biggest error (longest bar).
Measuring range of the PHA/TV display (here ±25°)
With automatic switch-over of the measuring range the
longest bar defines the measuring range.
Symbol for automatic switch-over of the measuring range.
Error display for: on-to-off ratio incremental signal 1 (TV1),
on-to-off ratio incremental signal 2 (TV2), phase angle error
between the two incremental signals (PHA)
If the measuring range is exceeded with manual switch-over of the measuring range, an
error is displayed. Switching over the measuring range: see standard soft-key row in section 3.2
Measuring range exceeded in negative direction
Measuring range exceeded in positive direction
Manual switch-over of the measuring range

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c): Peak hold of the PHA/TV display:
The peak hold holds and displays the maximum positive and negative value of the PHA/TV error.
It can be deleted by selecting a MODE or if the measuring range is exceeded. With automatic switch-over of
the measuring range, peak hold is not active for PHA/TV display.
Display of positive peak hold
Display of negative peak hold
Manual start and stop of peak hold:
If the peak-hold display is to be valid only for a certain measuring range, it can be started and stopped by
hand. Manual operation is made by means of the MODE soft-key row:
Soft key for manual control of the peak-hold display
Soft key for manual start of the peak-hold display in standard operation. The already existing
peak-hold display is deleted.
After pressing the START soft key the STOP soft key is displayed. If this soft key is pressed, the
peak-hold display is frozen and the bars of the PHA/TV display are hidden. Now the peak-hold
display can be read.
After pressing STOP, this soft key is displayed inverted which signals "frozen status". By pressing
the inverted soft key, the peak-hold display switches back to its initial status (standard operation).
d): Display field for PWM 8 MODE:
All MODES are displayed in the MODE window:
Headline MODE
(here additionally: edge evaluation of the
UNIVERSAL COUNTER))
Display field for the different MODES:
• UNIVERSAL COUNTER
• DETERMINE PULSE NUMBER
• MEASURE CURRENT/VOLTAGE
• MEASURE AMPLITUDES
See section 4, Description of the PWM 8 MODES

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e): Soft-key row for operation of PWM 8:
The soft-key row makes PWM 8 easy to operate. It automatically configures itself according to the functions
currently available.
Example: Soft-key row after power-on:
Standard setting of the soft-key row
f): Display field for the current assignment of the BNC sockets A, B and C:
This field contains the encoder signals currently fed to the
three BNC sockets BNC A, B and C.
2.8 Setting the Display Contrast
The contrast of the LC display of PWM 8 (Id.No. 309 956 X2) can be set from outside. The trimmer for
contrast adjustment is located next to the BNC socket C. A trimming screwdriver is required to change the
contrast. The contrast of PWM 8 units with the Id.No. 309 956 X1 can only be set internally.

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3. Operation
3.1 Display after Power-On
Software-Id.No. 246 199-xx;
the last two places symbolize the software
version (here: version 01)
Automatic recognition of the interface board
(here: TTL interface)
EXPERT MODE is active;
see section 5
Software compensation data
(for calibration by HEIDENHAIN staff)
Note on software compensation data:
The software compensation display is intended for calibration by HEIDENHAIN staff.
The settings displayed can only be changed by HEIDENHAIN, Traunreut.
3.2 Standard Soft-Key Row
After the power-on display, the standard soft-key row is displayed.
Possibilities of setting the standard soft-key row:
Switches to the soft-key row PWM 8 MODE (see PWM 8 MODE in section 4)
Assignment of the BNC sockets A, B and C to different encoder signals;
after pressing the BNC soft-key, you can choose from the following options:
By pressing this soft key the BNC sockets A
to C can be assigned to the encoder signals
from memory 1 to 3.
Terminate assignment of BNC sockets
The default setting of the BNC memories made by HEIDENHAIN can be changed any time.

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If e.g. the soft key BNC A is pressed, the assignment of the BNC socket A can be changed:
Terminate BNC assignment
Assignment of sockets B and C can be selected
Arrow keys to change the encoder signals of the
selected BNC socket A
Switching the BNC memory:
The assignment of the BNC sockets is stored in three BNC memories that can be called
successively.
Each time the soft key is pressed, the next BNC memory is activated.
The display of the active BNC memory is highlighted:
Changing the signals in the BNC memories 1 to 3:
The signal in the active BNC memory is automatically stored each time it is changed by
pressing the soft keys or .
After power interruption the signals of the BNC memory active last are allocated to the BNC
sockets.
Notes on the use of the BNC sockets:
• When using the BNC sockets to measure the encoder signals with an oscilloscope,
be sure that the workstation and the operator are properly grounded!
• A floating oscilloscope should be used to display the encoder signals with as little interference
as possible. Always connect the oscilloscope to the socket of the switch cabinet of the machine
tool to avoid signal distortions caused by different ground potentials.
The following encoder signals can be connected with the BNC sockets:
Interface Board Encoder signals on BNC socket BNC
memory
BNC A BNC B BNC C
11µApp Ue1
U1+2
Ue0
Ue2
U1+2
Ue0
Ue0
NTR
/UaS *)
1
2
3
1Vpp A
A+B
R
B
A+B
R
R
NTR
/UaS *)
1
2
3
TTL, HTL Ua1
/Ua1
Ua0
Ua2
/Ua2
/Ua0
Ua0
/Ua0
/UaS
1
2
3
*) Signal is generated in the PWM 8.

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Switching over the measuring range of the PHA/TV scaling.
The following measuring ranges can be selected:
The scaling currently selected is highlighted. When choosing automatic scaling (auto), the scaling
is adapted to the biggest error (longest bar).
This soft key serves to activate the Options soft-key row.
The following functions are available:
Terminate Options
EXPERT-MODE; see section 5
The encoder can be powered INTERNALLY
(by the power supply unit) or EXTERNALLY (by
the subsequent electronics). Current setting:
encoder powered INTERNALLY
The power supply for the encoder can be switched
ON and OFF.
The terminating resistors for the scanning signals
(with TTL or HTL and 1 Vpp interface board only)
can be switched ON and OFF. The current setting is
stored in PWM 8 and reloaded after power
interruption.
Interface board Terminating resistor [Ω]
0 V +U
encoder Switch- able
TTL 91 215 yes
HTL 1200 1200 yes
1Vpp 121 yes 1)
11µApp not available
1) only possible with interface board Id.No. 323 077-XX or 312 246-01, index A
The active setting is highlighted in the Options soft-key row.
Note:
The soft key is only displayed, if the PWM 8 is part of the encoder circuit, i.e. if a
subsequent electronics (with encoder supply voltage) is connected to the encoder output of the
interface board.

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This soft key serves to display the Info soft-key row:
Terminate INFO
If more information is available, the PWM switches
to the next INFO screen.
The interfering signal memory (ERROR) can be
erased
The background lighting of the display can be
switched on and off.
Information on PWM 8 and on the interface board can be displayed on the INFO screen.
Possible displays:
Encoder voltage of the subsequent electronics too
low to ensure proper function; see section 6:
Practical Application
11µApp, 1Vpp, TTL or HTL interface board
Terminating resistors for encoder signals: ON
here: 200 Ωon + and 91 Ωon GND
The supply voltage for the encoder is provided
INTERNALLY (power supply unit).
Counting direction of the UNIVERSAL COUNTER
(here: backward counting when encoder moves in
forward direction).
The power supply of the encoder can be set to 10V
max. without limit (except HTL); see section 3.2.2
Parameter Programming
The UNIVERSAL COUNTER starts with the next
reference pulse.
With the interface board 11µApp the amplification of
the output signals is indicated. The output signal of
e.g. 11µApp is displayed as a 3.3 Vpp voltage
signal at the oscilloscope.
The EXPERT MODE has been activated
(see section 3)
The PRESET entered for the UNIVERSAL
COUNTER is displayed.

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4. Description of the PWM 8 MODE
4.1 Switching the PWM 8 MODE
After the power-on message, the standard soft-key row is displayed, from which the MODE soft-key row of
PWM 8 can be called:
Soft key to call PWM 8 MODE
The following PWM 8 modes can be selected from the MODE soft-key row:
Start/stop of peak hold
Measure signal amplitudes
Measure the current consumption of the encoder and the
encoder voltage (and the sensor voltage)
Determine the pulse count of the encoder
(e.g. rotary encoder) and frequency display
UNIVERSAL COUNTER with frequency display
For each PWM 8 MODE the following auxiliary displays are active:
(Description see section 2.7: Explanation of the display)
• Display of the reference signal
• Encoder monitor with memory function
• Display of the counting direction
• PHA/TV display
• Assignment of the BNC sockets
After power interruption the last active mode is loaded again.
4.2 PWM 8 MODE: UNIVERSAL COUNTER with Frequency Display
The UNIVERSAL COUNTER counts the triggered edges of the incremental signals 1 and 2 of the encoder.
Note:
The function of the UNIVERSAL COUNTER is defined by the counter parameters P5 to P7. The
UNIVERSAL COUNTER can be loaded with a preset. See section 5: EXPERT MODE, parameters and
PRESET editor.
MODE UNIVERSAL COUNTER with edge evaluation (see
parameter P4)
Display of universal counter
Frequency display
Sign

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Clearing the UNIVERSAL COUNTER:
The UNIVERSAL COUNTER is cleared by pressing the soft key a second time.
Frequency counter:
The frequency counter operates up to a frequency of 2 MHz.
The frequency is derived from the incremental signal 1.
4.3 PWM 8 MODE: DETERMINE PULSE NUMBER with Frequency Display
The MODE DETERMINE PULSE NUMBER is intended to find the pulse count of a rotary encoder.
The parameter P5: EDGE EVALUATION is automatically set to 1-fold, the parameter
P6: COUNTING MODE to 0-1-2!
MODE DETERMINE PULSE NUMBER
Pulse number (line count)
Frequency display
Proceeding to determine the pulse count:
Each time "DETERMINE PULSE NUMBER" is activated, the pulse counter is reset, i.e. the
next reference signal starts the counter, the next but one stops it. This function can be of use e.g. when
operating with measuring systems with distance-coded reference marks.
First reference signal starts the pulse counter
Break of approx. 1 second (= display time of the pulse count)
Display of intermediate pulse counts
Next reference signal stops the pulse counter
Display of the pulse count

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4.4 PWM 8 MODE: MEASURE U/I
The PWM MODE: MEASURE U/I the current consumption and the power supply of the encoder can be
measured.
Depending on the interface board also the sensor voltages can be measured as well.
In the subsequent electronics the sensor lines serve to tap the encoder voltage directly at the encoder at
high resistance and to feed it back to the subsequent electronics. Voltage drops on the supply lines of the
encoders are then compensated in subsequent electronics offering compensation.
TTL, HTL and 1Vpp encoders are equipped with sensor lines.
If an error is detected during measurement of the sensor voltages, a blinking error field is displayed in
MODE: MEASURE U/I.
Error display during measurement
of the sensor voltage
A sensor-voltage error is displayed, if:
+ sensor smaller than 90 % of U-MSYS, or
- sensor larger than 10 % of U-MSYS
Note:
In the PWM 8 MODE: MEASURE U/I the supply lines of the encoder and the sensor lines are separated,
whereas in all other PWM 8 MODES they are connected to each other!
The current consumption of the terminating resistors (with TTL and HTL interface boards) is displayed
together with the current consumption of the encoder. I.e. even if no encoder is connected, the current
consumption of the encoder is displayed, if the terminating resistors and the encoder supply voltage
are switched on.

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4.4.1 Display of the PWM 8 MODE: MEASURE U/I in the Mode Window
Depending on the power supply of the encoder and of PWM 8, the MODE MEASURE U/I may be displayed
differently in the MODE window:
MODE: MEASURE U/I of encoders with sensor lines
(TTL, HTL, 1Vpp interface boards):
• and internally powered encoder (= via power supply unit) or
• externally powered encoder and parameter: P2 U-MSYS EXTERN = FLOATING
Floating power supply of the encoder with relation to the
subsequent electronics.
Current consumption of the encoder
Power supply of the encoder
(here: floating)
Sensor lines of the encoder
Special feature of HTL interface board:
A floating power supply of the encoder is not possible. The parameter P2 has no function.
The MODE MEASURE U/I is displayed as follows with HTL interface board:
Special feature of HTL interface board:
The encoder is powered by the power
supply unit (= internally) without potential segregation.
• externally powered encoder and parameter: P2 U-MSYS EXTERN = FROM CUSTOMER
The encoder is powered directly by the subsequent
electronics without potential segregation.
Current consumption of the encoder
Power supply of the encoder
(here: customer voltage)
Sensor voltages of the encoder

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MODE: MEASURE U/I of encoders without sensor lines
(11µApp interface boards):
• und interner Meßsystemversorgung (= aus Externem Netzteil) oder
• externer Meßsystemversorgung und Parameter: P2 U-MSYS EXTERN = POTENTIALFREI
Floating power supply of the encoder with relation to the
subsequent electronics.
Current consumption of the encoder
Power supply of the encoder
• externer Meßsystemversorgung und Parameter: P2 U-MSYS EXTERN = VON KUNDE
The encoder is powered directly by the subsequent
electronics (customer) without potential segregation
Current consumption of the encoder
Note: No potential segregation between encoder
and subsequent electronics
Power supply of the encoder (= customer voltage)

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4.5 PWM 8 MODE: MEASURE AMPLITUDES
In this mode the vertices of the amplitudes of the incremental signals 1 and 2 are measured. The result
always refers to an individual signal period. With sinusoidal encoder signals (11µApp and 1Vpp) the positive
and the negative vertices are measured versus U0, with square-wave encoder signals (TTL and HTL) low
and high level are measured versus 0V.
In the table below the maximum measuring ranges are listed for the different interface boards:
Interface board: 11µApp 1Vpp TTL HTL
Maximum measuring range 33 µApp 1.66 Vpp low: 0 –2.5 V
high: 2.5 –7.5 V low: 0 –7.5 V high: 7.5 –22.5 V
If the EXPERT MODE is active (see section 5) and the 11 µApp or 1Vpp interface board used, the encoder
supply voltage can be set in the mode MEASURE AMPLITUDES:
For this purpose the standard soft-key row has been expanded by the soft key .
Soft key to switch to setting of encoder voltage
After pressing the soft key the encoder voltage can be set:
Soft key to switch back to the standard
soft-key row
Display of encoder voltage
Soft keys to set the encoder voltage