Woodward SPM-D Series User manual

37616B
Manual
From Release 7.10-0
Manual 37616B
SPM-D2-10B/PSY5
Synchronizing Unit

Manual 37616B SPM-D2-10B/PSY5 - Synchronizing Unit
Page 2/58 © Woodward
WARNING
Read this entire manual and all other publications pertaining to the work to be performed before in-
stalling, operating, or servicing this equipment. Practice all plant and safety instructions and precau-
tions. Failure to follow instructions can cause personal injury and/or property damage.
The engine, turbine, or other type of prime mover should be equipped with an overspeed (overtemper-
ature, or overpressure, where applicable) shutdown device(s), that operates totally independently of
the prime mover control device(s) to protect against runaway or damage to the engine, turbine, or oth-
er type of prime mover with possible personal injury or loss of life should the mechanical-hydraulic
governor(s) or electric control(s), the actuator(s), fuel control(s), the driving mechanism(s), the link-
age(s), or the controlled device(s) fail.
Any unauthorized modifications to or use of this equipment outside its specified mechanical, electri-
cal, or other operating limits may cause personal injury and/or property damage, including damage to
the equipment. Any such unauthorized modifications: (i) constitute "misuse" and/or "negligence" with-
in the meaning of the product warranty thereby excluding warranty coverage for any resulting damage,
and (ii) invalidate product certifications or listings.
CAUTION
To prevent damage to a control system that uses an alternator or battery-charging device, make sure
the charging device is turned off before disconnecting the battery from the system.
Electronic controls contain static-sensitive parts. Observe the following precautions to prevent dam-
age to these parts.
Discharge body static before handling the control (with power to the control turned off, contact a
grounded surface and maintain contact while handling the control).
Avoid all plastic, vinyl, and Styrofoam (except antistatic versions) around printed circuit boards.
Do not touch the components or conductors on a printed circuit board with your hands or with
conductive devices.
OUT-OF-DATE PUBLICATION
This publication may have been revised or updated since this copy was produced. To verify that you
have the latest revision, be sure to check the Woodward website.
The revision level is shown at the bottom of the front cover after the publication number. The latest
version of most publications is available at:
http://www.woodward.com/publications
If your publication is not there, please contact your customer service representative to get the latest
copy.
Important definitions
WARNING
Indicates a potentially hazardous situation that, if not avoided, could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation that, if not avoided, could result in damage to equipment.
NOTE
Provides other helpful information that does not fall under the warning or caution categories.
Woodward reserves the right to update any portion of this publication at any time. Information provided by Woodward is believed to be
correct and reliable. However, Woodward assumes no responsibility unless otherwise expressly undertaken.
© Woodward
All Rights Reserved.

Manual 37616B SPM-D2-10B/PSY5 - Synchronizing Unit
© Woodward Page 3/58
Copyright And Disclaimer
Disclaimer
All information and instructions in this manual have been provided under due consideration of applicable guide-
lines and regulations, the current and known state of the art, as well as our many years of in-house experience.
Woodward GmbH assumes no liability for damages due to:
•Failure to comply with the instructions in this manual
•Improper use / misuse
•Willful operation by non-authorized persons
•Unauthorized conversions or non-approved technical modifications
•Use of non-approved spare parts
The originator is solely liable to the full extent for damages caused by such conduct. The agreed upon obligations
in the delivery contract, the general terms and conditions, the manufacturer’s delivery con-ditions, and the statuto-
ry regulations valid at the time the contract was concluded, apply.
Copyright
This manual is protected by copyright. No part of this manual may be reproduced in any form or incor-porated into
any information retrieval system without written permission of Woodward GmbH.
Delivery of this manual to third parties, duplication in any form - including excerpts - as well as exploita-tion and/or
communication of the content, are not permitted without a written declaration of release by Woodward GmbH.
Service And Warranty
Our Customer Service is available for technical information. Please see last page for the contact data.
Warranty terms
Please enquire about the terms of warranty from your nearest Woodward representative.
For our contact search webpage please go to: http://www.woodward.com/Directory.aspx
Intended Use
The SPMD device must be used exclusively for synchronization of two electrical systems. By opening the device
you will loose any warranty.
Any unauthorized modifications to or use of this equipment outside its specified mechanical, electrical, or other
operating limits may cause personal injury and/or property damage, including damage to the equipment. Any
such unauthorized modifications: (1) constitute "misuse" and/or "negligence" within the meaning of the product
warranty thereby excluding warranty coverage for any resulting damage, and (2) invalidate product certifications
or listings.
Before starting any operation and after any modification of the parameterization make a documentary proof that
your programming and parameterization meets the requirements of your synchronization concept.
Typical applications for this product family/device line are for instance:
Synchronizing a mains parallel Generator to the mains
Any usage beyond these applications the devices are not designed for. This applies also to the use as a partly
completed machinery. The manufacturer cannot be held liable for any resulting damage, the user alone bears the
risk for this. As to the appropriate use of the device: The technical data and tolerances specified by Woodward
have to be met.

Manual 37616B SPM-D2-10B/PSY5 - Synchronizing Unit
Page 4/58 © Woodward
Revision History
Rev.
Date
Editor
Changes
B
2016-02-17
GG
UL rating added to technical data / ambient variables for N & XN packages. See page 58.
A
2016-01-27
GG
Changed product name from SPM-D-xxx to SPM-D2-xxx.
NEW
2015-12-09
GG
Release
Content
Copyright And Disclaimer ...................................................................................................... 3
Service And Warranty............................................................................................................ 3
Intended Use.......................................................................................................................... 3
CHAPTER 2. GENERAL INFORMATION........................................................................ 7
CHAPTER 3. ELECTROSTATIC DISCHARGE AWARENESS ............................................ 8
CHAPTER 4. INSTALLATION ...................................................................................... 9
Wiring diagram .................................................................................................................... 10
SPM-D2-10B/PSY5-FU-D (power supply: 24 Vdc).................................................... 10
SPM-D2-10B/PSY5-FU-D-W (power supply: 90..250 Vac or 120...375 Vdc) ........... 11
Reference point ................................................................................................................... 12
Power supply (standard & SPM-D2-10B/PSY5-FU-D-W).................................................... 12
Measuring inputs.................................................................................................................. 13
System 2.................................................................................................................... 13
System 1.................................................................................................................... 14
Discrete inputs..................................................................................................................... 15
Relay outputs....................................................................................................................... 16
Controller outputs................................................................................................................. 17
SPM-D2-10B/PSY5-..D.............................................................................................. 17
CHAPTER 5. DESCRIPTION OF FUNCTIONS .............................................................. 18
Functionality......................................................................................................................... 18
Function tables .......................................................................................................... 18
Additional conditions.................................................................................................. 19
Control inputs....................................................................................................................... 20
Isolation of the power supply from the discrete inputs......................................................... 20
Operating conditions............................................................................................................ 21
No load control .......................................................................................................... 21
Synchronizing............................................................................................................ 21
Synch check .............................................................................................................. 22
Isolated operation...................................................................................................... 22
Closing the CB without synchronization (black start)................................................. 22
LED "Closed" flashes ................................................................................................ 23
Control outputs..................................................................................................................... 23
CHAPTER 6. DISPLAY AND OPERATING ELEMENTS .................................................. 24
Brief explanation of the LEDs and push buttons.................................................................. 25
LEDs.......................................................................................................................... 25
Buttons ...................................................................................................................... 25
Others........................................................................................................................ 25
LEDs.................................................................................................................................... 26
Push buttons........................................................................................................................ 28

Manual 37616B SPM-D2-10B/PSY5 - Synchronizing Unit
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LC display.............................................................................................................................29
Display monitoring in automatic mode: Double voltage / frequency display..............29
Display monitoring in automatic mode: Alarm indication ...........................................29
CHAPTER 7. CONFIGURATION................................................................................. 30
Configure basic data ............................................................................................................31
Password protection...................................................................................................32
Configure basic settings.......................................................................................................34
Configure controller..............................................................................................................35
No load control...........................................................................................................35
Frequency controller ..................................................................................................36
Synchronization time monitoring................................................................................42
Black start..................................................................................................................43
Relay output 16-17.....................................................................................................44
Password configuration........................................................................................................45
CHAPTER 8. COMMISSIONING................................................................................. 46
APPENDIX A. DIMENSIONS ..................................................................................... 48
APPENDIX B. LIST OF PARAMETERS ....................................................................... 49
APPENDIX C. TECHNICAL DATA.............................................................................. 51
APPENDIX D. SERVICE OPTIONS............................................................................. 53
Product Service Options.......................................................................................................53
Returning Equipment For Repair..........................................................................................53
Packing A Control ......................................................................................................54
Return Authorization Number RAN............................................................................54
Replacement Parts...............................................................................................................54
How To Contact Woodward.................................................................................................55
Engineering Services ...........................................................................................................56
Technical Assistance ...........................................................................................................57

Manual 37616B SPM-D2-10B/PSY5 - Synchronizing Unit
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Illustrations and Tables
Illustrations
Figure 4-1: Wiring diagram SPM-D2-10B/PSY5-FU-D .....................................................................................10
Figure 4-2: Wiring diagram SPM-D2-10B/PSY5-FU-D-W ................................................................................11
Figure 4-3: Reference point .................................................................................................................................12
Figure 4-4: Power supply (24 Vdc, standard)......................................................................................................12
Figure 4-5: Power supply (90..250 Vac / 120 to 375 Vdc, SPM-D2-10B/PSY5-FU-D-W)................................12
Figure 4-6: Measuring inputs –voltage system 2 ................................................................................................13
Figure 4-7: Measuring inputs –Voltage system 1 ...............................................................................................14
Figure 4-8: Discrete inputs ..................................................................................................................................15
Figure 4-9: Relay outputs –control outputs I (CB control).................................................................................16
Figure 4-10: Relay outputs –control outputs II (messages) ................................................................................16
Figure 4-11: Controller - SPM-D2-10B/PSY5-..D.. –three position controller..................................................17
Figure 6-1: Front foil...........................................................................................................................................24
Figure 8-1: Dimensions .......................................................................................................................................48
Tables
Table 5-1: Operating conditions ..........................................................................................................................18
Table 5-2: Operating conditions - terms ..............................................................................................................19

Manual 37616B SPM-D2-10B/PSY5 - Synchronizing Unit
© Woodward Page 7/58
Chapter 2.
General Information
Intended Use The unit must only be operated for the uses described in this manual. The prerequisite for a proper
and safe operation of the product is correct transportation, storage, and installation as well as careful operation
and maintenance.
NOTE
This manual has been developed for a unit fitted with all available options. Inputs/outputs, func-
tions, configuration screens and other details described, which do not exist on your unit may be
ignored.
The present manual has been prepared to enable the installation and commissioning of the unit.
On account of the large variety of parameter settings, it is not possible to cover every possible
combination. The manual are therefore only a guide. In case of incorrect entries or a total loss of
functions, the default settings can be taken from the enclosed list of parameters.

Manual 37616B SPM-D2-10B/PSY5 - Synchronizing Unit
Page 8/58 © Woodward
Chapter 3.
Electrostatic Discharge Awareness
All electronic equipment is static-sensitive, some components more than others. To protect these components
from static damage, you must take special precautions to minimize or eliminate electrostatic discharges.
Follow these precautions when working with or near the control.
1. Before doing maintenance on the electronic control, discharge the static electricity on your body to ground
by touching and holding a grounded metal object (pipes, cabinets, equipment, etc.).
2. Avoid the build-up of static electricity on your body by not wearing clothing made of synthetic materials.
Wear cotton or cotton-blend materials as much as possible because these do not store static electric charg-
es as easily as synthetics.
3. Keep plastic, vinyl, and Styrofoam materials (such as plastic or Styrofoam cups, cigarette packages, cello-
phane wrappers, vinyl books or folders, plastic bottles, etc.) away from the control, modules, and work ar-
ea as much as possible.
4. Opening the control cover may void the unit warranty.
Do not remove the printed circuit board (PCB) from the control cabinet unless absolutely necessary. If you
must remove the PCB from the control cabinet, follow these precautions:
Ensure that the device is completely voltage-free (all connectors have to be disconnected).
Do not touch any part of the PCB except the edges.
Do not touch the electrical conductors, connectors, or components with conductive devices or with bare
hands.
When replacing a PCB, keep the new PCB in the plastic antistatic protective bag it comes in until you
are ready to install it. Immediately after removing the old PCB from the control cabinet, place it in the
antistatic protective bag.
CAUTION
To prevent damage to electronic components caused by improper handling, read and observe the pre-
cautions in Woodward manual 82715, Guide for Handling and Protection of Electronic Controls, Print-
ed Circuit Boards, and Modules.
NOTE
The unit is capable to withstand an electrostatic powder coating process with a voltage of up to 85 kV
and a current of up to 40 µA.

Manual 37616B SPM-D2-10B/PSY5 - Synchronizing Unit
© Woodward Page 9/58
Chapter 4.
Installation
CAUTION
A circuit breaker must be provided near to the unit and in a position easily accessible to the op-
erator. This must also bear a sign identifying it as an isolating switch for the unit.
NOTE
Inductivities connected (such as coils of operating current or undervoltage tripping units, or
auxiliary or power contacts) must be connected to a suitable interference suppressor.

Manual 37616B SPM-D2-10B/PSY5 - Synchronizing Unit
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Wiring diagram
SPM-D2-10B/PSY5-FU-D (power supply: 24 Vdc)
Referencepoint
SPM-D2-10B/PSY5-FU-D(Synchroizing Unit)
14
Command:closeCB
2423
3
alternatively
3
Subject totechnicalmodifications.
L1
L2 Voltage system1
15 3 4 11
2120 10
1312 8 9
CB
3
CB
alternatively
3Drive
G
Reply:CBisopen
EnableCB
Voltagesystem2
Common(term.3,4,5,6)
Enableisolatedoperation/ black start
Activationofparameterset B
0 1 52 6
Readinessforoperation
719
Function:
make-
contact
18
Thesocket forthe PCconfiguration
issituatedonthe side ofthe unit.
SPEED
Three-positioncontroller
VOLTAGE
Three-positioncontroller
lower
raise
raise
lower
L1
L2
Battery
#
0Vdc
24Vdc
16 17
Additionalcommand:closeCB
Figure 4-1: Wiring diagram SPM-D2-10B/PSY5-FU-D

Manual 37616B SPM-D2-10B/PSY5 - Synchronizing Unit
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SPM-D2-10B/PSY5-FU-D-W (power supply: 90..250 Vac or 120...375 Vdc)
Referencepoint
14
Command:closeCB
2423
3
alternatively
3
Subject totechnicalmodifications.
L1
L2 Voltage system1
15 3 4 11
2120 10
1312 8 9
CB
3
CB
alternatively
3Drive
G
Reply:CBisopen
EnableCB
Voltagesystem2
Common(term.3,4,5,6)
Enableisolatedoperation/ black start
Activation of Parameter Set B
05 6
Readinessforoperation
719
Function:
make-
contact
18
Thesocket forthe PCconfiguration
issituatedonthe side ofthe unit.
SPEED
Three-positioncontroller
VOLTAGE
Three-positioncontroller
lower
raise
raise
lower
L1
L2
Battery
#
SPM-D2-10B/PSY5-FU-D-W(Synchroizing Unit)
16 17
Additionalcommand:closeCB
N
PE
292725
L (90..250 Vac / 120..375 Vdc)
Figure 4-2: Wiring diagram SPM-D2-10B/PSY5-FU-D-W

Manual 37616B SPM-D2-10B/PSY5 - Synchronizing Unit
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Reference point
0
Referencepoint
Figure 4-3: Reference point
Terminal
Description
Amax
0
Reference point: Neutral point of the three-phase system or neutral
terminal of the voltage transformer (Measuring reference point);
with three-conductor systems, do not connect
Sold.lug
Power supply (standard & SPM-D2-10B/PSY5-FU-D-W)
24 Vdc (+/-25 %)
1 2
24 Vdc
0 Vdc
Power supply
Standard
Figure 4-4: Power supply (24 Vdc, standard)
Terminal
Description
Amax
Standard
1
+24 Vdc, 10 W
2.5 mm²
2
0 V reference potential
2.5 mm²
Figure 4-5: Power supply (90..250 Vac / 120 to 375 Vdc, SPM-D2-10B/PSY5-FU-D-W)
Terminal
Description
Amax
SPM-D2-10B/PSY5-..W - wide range power supply
25
90..250 Vac / 120 to 375 Vdc, max. 10 VA
2.5 mm²
27
PE
2.5 mm²
29
0 Vac
2.5 mm²

Manual 37616B SPM-D2-10B/PSY5 - Synchronizing Unit
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Measuring inputs
NOTE
The SPM-D2-10B/PSY5 can operate (monitor) only one synchronization point (one power circuit
breaker), because it is a 1-power-circuit-breaker configuration. The voltage at terminals 23/24
(system 1) is the voltage to which the assessment of the synchronization at terminals 20/21 (sys-
tem 2) refers. The synchronization voltage can be, e. g., the mains or busbar voltage.
NOTE
There are generally three different variants for connection of the measuring circuit voltage:
Direct connection to the low voltage system,
Connection to medium voltage via two-pole isolated transformer (e. g. in the case of a
V-connection) and
Connection to medium voltage via single-pole isolated transformer (e. g. Y-connection).
System 2
Voltage
System2
1L1
L2
G
21200
MCB
N
L3
L1
L2
GCB
23
Figure 4-6: Measuring inputs –voltage system 2
Note: Connection corresponding to the mains configuration (see wiring diagram).
Terminal
Measurement
Description
Amax
Connection to the measuring circuit voltage corresponding to the variant , or 
20
direct or
Transformer
../100 V
Voltage system 2 - L1
2.5 mm²
21
Voltage system 2 - L2
2.5 mm²
0
Reference point: N-terminal of the low voltage
system or star point of the voltage transducer
(measuring reference point);
do not connect in three wire installations
Sold.lug

Manual 37616B SPM-D2-10B/PSY5 - Synchronizing Unit
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System 1
Voltage
System 1
GCB
G
L2
L1
23 24
123
N
L1
L2
L3
231
MCB
Figure 4-7: Measuring inputs –Voltage system 1
Note: Connection corresponding to the mains configuration (see wiring diagram).
Terminal
Measurement
Description
Amax
Connection to the measuring circuit voltage corresponding to variant , or 
23
direct
or ../100 V
Voltage system 1 - L1
2.5 mm²
24
Voltage system 1 - L2
2.5 mm²

Manual 37616B SPM-D2-10B/PSY5 - Synchronizing Unit
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Discrete inputs
CAUTION
Please note that the maximum voltages which may be applied at the discrete inputs are defined
as follows. Voltages higher than those specified destroy the hardware!
Maximum input range: +/-18..250 Vac.
D
Signal device
CB
Reply CB Enable CB
Reply: CB is open
BA
18..250Vac/dc
C
3
Figure 4-8: Discrete inputs
Terminal
Associated
zero-terminal
Description
(acc. DIN 40 719 part 3, 5.8.3)
Amax
Make contact
A
B
3
7
Enable CB
2.5 mm²
5
Enable isolated operation / black start
2.5 mm²
6
Activation of parameter set B
2.5 mm²
Normally closed contact
C
D
4
7
Reply: CB is open
2.5 mm²

Manual 37616B SPM-D2-10B/PSY5 - Synchronizing Unit
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Relay outputs
max. 250 V AC
AB
external device Relay output
Figure 4-9: Relay outputs –control outputs I (CB control)
Root
Switched
Description
Amax
A
B
14
15
Synchronizing pulse, Command: close CB
2.5 mm²
max. 250 V AC
AB
external device Relay output
Figure 4-10: Relay outputs –control outputs II (messages)
Root
Switched
Description
Amax
A
B
Note: The relays close when the function is fulfilled.
16
17
Message: Connect 2
2.5 mm²
18
19
Readiness for operation
2.5 mm²

Manual 37616B SPM-D2-10B/PSY5 - Synchronizing Unit
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Controller outputs
The SPM-D2-10B/PSY5-FU-D.. is equipped with two three-position controllers for voltage and frequency (made
of a form C and form A relay). With the version SPM-D2-10B/PSY5-FU-A different controller output signals can
be selected by configuration, which are connected in different ways.
SPM-D2-10B/PSY5-..D..
max. 250 Vac
11 12 13
Voltage
controller
Common
Raise
Lower
Voltage controller
8
Common
Speed
controller Speed / frequency
controller
910
Lower
Raise
Figure 4-11: Controller - SPM-D2-10B/PSY5-..D.. –three position controller
Terminal
Description
Amax
8
common
Speed/frequency controller
2.5 mm²
9
higher
2.5 mm²
10
lower
2.5 mm²
11
common
Voltage controller
2.5 mm²
12
higher
2.5 mm²
13
lower
2.5 mm²

Manual 37616B SPM-D2-10B/PSY5 - Synchronizing Unit
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Chapter 5.
Description of Functions
Functionality
Function tables
The status of the discrete inputs "Reply: CB open" and "Enable CB" is displayed via the LEDs "Closed" und "En-
able" on the pressure-sensitive front membrane. Additionally to the input signals the conditions in Table 5-2: Op-
erating conditions - terms must be noticed.
Input signal
Operating condition
Cond.
Relay "Command: close CB"
LED
"Closed"
LED
"Enable"
Discr. inp. term. 5: "Enable
isolated op. / Blackstart"
0
0
x
OFF or
automatic no-load control
-
C1
OFF
OFF
0
1
0
No-load operation or
synchronization or
synch-check
C
A
A1
OFF
Slip or phase zero
Synch-check
0
1
1
No-load operation or
synchronization or
Synch-check or
Black start
C
A
A1
B
OFF
Slip or phase zero
Synch-check
Black start
1
x
0
OFF
-
OFF
1
x
1
Isolated operation
D
OFF
0: "OFF" / 1: "ON" / x: Signal of no significance (0 or 1)
Table 5-1: Operating conditions

Manual 37616B SPM-D2-10B/PSY5 - Synchronizing Unit
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Additional conditions
The function of the unit is also dependent, apart from the discrete input signals, on the state of the available meas-
ured voltages. The particular function must also be activated in configuration mode:
Condition
A
Synchronization
- Voltage of system 1 and system 2 must apply to the following conditions:
50 % < U < 125 % of the rated voltage VN
80 % < f < 110 % of the rated frequency fN
(after time monitoring trips, the synchronization will be aborted)
A1
Synch-check
- Voltage of system 1 and system 2 must apply to the following conditions:
50 % < U < 125 % of the rated voltage VN
80 % < f < 110 % of the rated frequency fN
B
Blackstart
- Parameter "black start gen. switch ON"
- One of the three black start options must be switched on and the voltages
U1 and U2 must be within the configured limits for the black start
C1
Automatic no-load control
- Parameter "Automatic no-load control ON"
- The frequency controller applies to the following conditions:
Voltage of system 2 > 50 % of the rated voltage VN
- The voltage controller applies to the following conditions:
Frequency of system 2 > 90 % of the rated frequency fN
C
No-load operation
- for f control:
Voltage of system 2 > 50 % of rated voltage VN
- for V control:
Frequency of system 2 > 90 % of rated frequency VN
D
Isolated operation
- Voltage of system 2 > 50 % of rated voltage VN
- For voltage controller: Parameter "Voltage controller in no-load operation
ON"
- For frequency controller: Parameter "Frequency controller in isolated op-
eration ON".
Table 5-2: Operating conditions - terms

Manual 37616B SPM-D2-10B/PSY5 - Synchronizing Unit
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Control inputs
Enable CB
Terminal 3
If this discrete input is set, the operation of the power circuit breaker
and the control functions are enabled at the same time, if this input is
set. If the power circuit breaker is closed, this input has no effect.
Reply:
CB is open
Terminal 4
The status of the CB must be transmitted to this unit through this in-
put. The input must be set if the CB is open. (The status of this input
is checked for its plausibility and is signaled with the LED "Closed".)
Enable: Isolated
operation/black start
Terminal 5
With an opened power circuit breaker a black start is enabled, by set-
ting this input. With a closed power circuit breaker the frequency and
voltage controllers are enabled for isolated operation, by setting this
input.
Activation of set of
parameters B
Terminal 6
With this discrete input you can switch between the two parameter
sets A and B. If this discrete input is set the unit works with parameter
set B, otherwise with parameter set A. One set of parameters includes
the parameters
three-position controller: gain, time pulse, and insensitivity
of the frequency and voltage controller and of the actual synchroniza-
tion the pull-in time of the switch.
Isolation of the power supply
from the discrete inputs
By means of an appropriate external wiring, the common reference point of the discrete inputs (terminal 7) can be
metallically separated from the supply voltage (0 V, terminal 2) . This is for instance necessary, if the discrete in-
puts are not to be controlled with +24 Vdc and a metallic separation of the control voltage (e. g. 220 Vdc,
220 Vac) from the supply voltage has to be ensured.
Wiring should be made as follows:
Reference points connected with 0 V
Bridge between terminal 7 and terminal 2 (0 V)
Reference point of the discrete inputs potential-free:
Terminal 2: 0 V (supply voltage)
Terminal 7: 0 V or N (control voltage)