Samson 3374 Service manual

Mounting and
Operating Instructions
EB 8331-4 EN
Firmware version 2.04
Edition April 2014
Type 3374 Electric Actuator
Version with positioner, revision 2

Denition of signal words
DANGER!
Hazardous situations which, if not
avoided, will result in death or seri-
ous injury
WARNING!
Hazardous situations which, if not
avoided, could result in death or seri-
ous injury
NOTICE
Property damage message or mal-
function
Note:
Additional information
Tip:
Recommended action

2 EB 8331-4 EN

Contents
EB 8331-4 EN 3
1 General safety instructions.............................................................................7
2 Design and principle of operation ..................................................................8
2.1 Versions........................................................................................................8
2.2 Limit contacts.................................................................................................8
2.2.1 Mechanical limit contacts................................................................................8
2.2.2 Electronic limit contacts...................................................................................8
2.3 Technical data ...............................................................................................9
3 Installation..................................................................................................12
3.1 Mounting position........................................................................................12
3.2 Attachment to valve......................................................................................13
3.2.1 Construction with integrated yoke..................................................................13
3.2.2 Construction with ring nut.............................................................................13
4 Electrical connections...................................................................................15
5 Putting the actuator into operation ...............................................................16
6 Manual override .........................................................................................16
6.1 Mechanical override (only actuators without fail-safe action)...........................16
6.2 Moving the actuator stem manually ...............................................................16
7 Mechanical limit contacts .............................................................................17
7.1 Installing the limit contacts ............................................................................17
7.2 Adjusting the limit contacts ...........................................................................20
8 Electronic limit contacts................................................................................20
8.1 Installing the limit contacts ............................................................................20
8.2 Adjusting the limit contacts ...........................................................................21
9 Dimensions in mm.......................................................................................22
10 Operating controls ......................................................................................24
10.1 Display .......................................................................................................25
10.2 Rotary pushbutton........................................................................................27
10.2.1 Menu control ...............................................................................................27
10.3 Serial interface ............................................................................................28
11 Key number ................................................................................................29
11.1 Customized key number ...............................................................................30

4 EB 8331-4 EN
Contents
12 Operating level ...........................................................................................31
12.1 Selecting operating mode.............................................................................31
12.2 Adapting the display....................................................................................32
12.2.1 Reading direction.........................................................................................32
12.2.2 Backlight.....................................................................................................32
12.3 Initializing the actuator.................................................................................33
12.4 Reading errors.............................................................................................34
12.5 Applications................................................................................................35
12.5.1 Positioner ....................................................................................................35
12.5.2 PID controller...............................................................................................35
12.5.3 Two-step mode ............................................................................................36
13 Conguration level ......................................................................................37
13.1 Activating and setting parameters .................................................................37
13.2 Input signal .................................................................................................38
13.3 Operating direction......................................................................................39
13.4 End position guiding ....................................................................................41
13.4.1 Operating direction increasing/increasing.....................................................41
13.4.2 Operating direction increasing/decreasing....................................................41
13.5 Position feedback signal ...............................................................................41
13.6 Binary input ................................................................................................42
13.7 Binary output...............................................................................................43
13.8 Electronic limit contacts.................................................................................44
13.9 Restart ........................................................................................................45
13.10 Blockage.....................................................................................................45
13.11 Travel..........................................................................................................46
13.12 Characteristic ..............................................................................................47
14 Information level .........................................................................................50
14.1 Activating parameters ..................................................................................50
15 Diagnostic level...........................................................................................51
15.1 Activating and setting parameters .................................................................52
15.2 Troubleshooting ...........................................................................................53
15.3 Start zero calibration....................................................................................54

Contents
EB 8331-4 EN 5
15.4 Start initialization.........................................................................................54
15.5 Restarting the actuator (reset)........................................................................54
15.6 Loading default settings................................................................................54
15.7 Testing the display........................................................................................55
15.8 Measuring the transit time.............................................................................56
16 Memory pen ...............................................................................................57
16.1 Command pen.............................................................................................58
17 Appendix....................................................................................................60
17.1 Levels and customer data..............................................................................60
17.1.1 Operating level............................................................................................60
17.1.2 Congurationlevel.......................................................................................61
17.1.3 Information level..........................................................................................66
17.1.4 Diagnostic level ...........................................................................................67
17.1.5 Further codes on the display .........................................................................69
17.2 Nameplate..................................................................................................70
17.3 Customer inquiries .......................................................................................70
17.4 Replacing the display...................................................................................71
Firmware revisions
Old New
2.02 2.03
Internal revisions
2.03 2.04
Code c11 (Exit manual level for travel adjustment) indicated by MEND (previously MANU)
Memory pen with dialog
"No initialization performed" is indicated by RUNT and E00 error (previously NRUN,
E15)
IN/OUT reading for two-step mode

EB 8331-4 EN 7
General safety instructions
1 General safety instructions
For your own safety, follow these instructions concerning the mounting, start up and opera-
tion of the actuator:
−The actuator is to be mounted, started up or operated only by trained and experienced
personnel familiar with the product. According to these mounting and operating instruc-
tions, trained personnel refers to individuals who are able to judge the work they are as-
signed to and recognize possible dangers due to their specialized training, their knowl-
edge and experience as well as their knowledge of the applicable standards.
−Any hazards that could be caused in the valve by the process medium and the operating
pressure or by moving parts are to be prevented by taking appropriate precautions.
−The actuator is designed for use in low voltage installations. For wiring and maintenance,
you are required to observe the relevant safety regulations. Only use protective equip-
ment in which the power supply cannot be reconnected inadvertently.
−Before wiring the actuator, disconnect it from the power supply.
To avoid damage to any equipment, the following also applies:
−Proper shipping and storage are assumed.
Note:
Devices with a CE marking fulll the requirements of the Directives 2004/30/EU and
2014/35/EU.
The Declaration of Conformity is available on request.


8 EB 8331-4 EN
Design and principle of operation
2 Design and principle of op-
eration
The Type 3374 Electric Actuator is used in
industrial plants as well as in heating, venti-
lation and air-conditioning systems.
Theactuatorissuitableforform-tattach-
ment to various SAMSON valve series, and
with or without fail-safe action depending
on the version.
The stepper motor is switched off by
torque-dependent switches in the end posi-
tions or in case of overload. The force of the
motor is transmitted to the actuator stem via
gearing and ball screw.
Note:
On replacing a Type3374 Actuator
(revision 1) with a Type3374 Actua-
tor (revision 2), the wiring connection
of the binary input must be changed.
Instead of an external voltage supply,
a oating contact is needed. Other-
wise, the switching state cannot be
recognized.
Testing according to DINEN14597
TheType3374ElectricActuatorwithfail-ac-
tion "Actuator stem extends" is tested by the
German Technical Inspectorate (TÜV) ac-
cordingtoDINEN14597incombination
with various SAMSON valves. The register
number is available on request.
2.1 Versions
TheType3374ElectricActuatorisavailable
with or without fail-safe action.
Version with fail-safe action
Type 3374-2x and Type 3374-3x Actuators
are able to perform a fail-safe action and
contain a spring assembly and an electromag-
net. The actuator moves to the fail-safe posi-
tion when the electromagnet is de-energized.
ÎDo not use the fail-safe action to control
the valve position!
2.2 Limit contacts
The actuator can be equipped with either
mechanical or electronic limit contacts to in-
uencethetasksofcontrolequipment.
2.2.1 Mechanical limit con-
tacts
The two mechanical limit contacts can be ad-
justed independently from one another. They
are operated by mechanical pins. The instal-
lation and adjustment of the mechanical limit
contacts is described in section 7.
2.2.2 Electronic limit contacts
The two electronic limit contacts consist of re-
lays with changeover contacts. In contrast to
the mechanical limit contacts, the electronic
limit contacts no longer function after a power
supply failure. The relays are de-energized
and the contacts change to the idle state. The
retrottingandadjustmentoftheelectronic
limit contacts is described in section 8.


EB 8331-4 EN 9
Design and principle of operation
2.3 Technical data
Table1: Version without fail-safe action
Actuator Type 3374 -10 -11 -15
Type of connection With yoke 1) With ring nut 2)
Travel mm 30 15 30
Travel limit Between10and100%oftheratedtravel
Electrical connection
Power supply 24VAC±15%,47to63Hz
24VDC±15%
85to264VAC,47to63Hz
Power consumption Speed level: Normal · Fast
24 V AC 12 VA · 20 VA
DC 8 W · 13.5 W
85 to 264 V AC 15.5 VA · 24 VA
Possible fuse protection Melting integral of upstream fuse: I²ts≥12A²s
Transit time in s · Stroking speed in mm/s
Normal 3) 120 · 0.25 60 · 0.25 120 · 0.25 240 · 0.125
Fast 4) 60 · 0.5 30 · 0.5 60 · 0.5 120 · 0.25
Thrust in kN
Stem extends 2.5 2.5 2.5 5 5)
Stem retracts 2.5 2.5 2.5 5 5)
Manual override 4mmhexwrench.Refertosection6.
Weight
kg (approx.) 3.5 3.5 3.6
1) ForattachmenttoSAMSONSeriesV2001Valves(DN15to80)andtoSAMSONType3260
(DN65to150)andType3214Valves(DN65to100)
2) ForattachmenttoSAMSONSeries240ValvesandtoSAMSONType3214Valve(DN125to250)
3) Normal speed level (Code c64 = NORM)
4) Fast speed level (Code c64 = FAST)
5) In preparation

10 EB 8331-4 EN
Design and principle of operation
Table2: Version with fail-safe action
Actuator Type 3374 -21 -26 -31 -36
Type of connection With yoke 1) With ring nut 2) With yoke 1) With ring nut 2)
Fail-safe action Stem extends Stem retracts
Travel mm 15 15
Travel limit Between10and100%oftheratedtravel
Electrical connection
Power supply 24VAC±15%,47to63Hz
24VDC±15%
85to264VAC,47to63Hz
Power consumption Speed level: Normal · Fast
24 V AC 13.5 VA · 22 VA
DC 10 W · 15 W
85 to 264 V AC 18.5 VA · 27 VA
Possible fuse protection Melting integral of upstream fuse: I²ts≥12A²s
Transit time in s · Stroking speed in mm/s
Normal 3) 60 · 0.25 60 · 0.25 60 · 0.25 60 · 0.25
Fast 4) 30 · 0.5 30 · 0.5 30 · 0.5 30 · 0.5
Upon fail-safe action 12 · 1.25 12 · 1.25 12 · 1.25 12 · 1.25
Forces in kN
Thrust (stem extends) 2 2 2 2
Thrust (stem retracts) 0.5 0.5 0.5 0.5
Nominal thrust of safety
spring 2 2 0.5 0.5
Manual override
–
Weight
kg (approx.) 4.2 4.3 3.8 3.9
1) ForattachmenttoSAMSONSeriesV2001Valves(DN15to80)andtoSAMSONType3260
(DN65to150)andType3214Valves(DN65to100)
2) ForattachmenttoSAMSONSeries240ValvesandtoSAMSONType3214Valve(DN125to250)
3) Normal speed level (Code c64 = NORM)
4) Fast speed level (Code c64 = FAST)

EB 8331-4 EN 11
Design and principle of operation
Table3: Common data
Type 3374-xx Actuator
Input signal
Voltage input 0/2 to 10 V, adjustable · Ri=20kΩ
Current input 0/4 to 20 mA, adjustable · Ri=50Ω
Note: Only one of the two inputs may be connected.
Position feedback Voltage 0/2 to 10 V, adjustable · Error message 12 V
Resolution 1000stepsor0.01V
Load Minimum5kΩ
Current 0/4 to 20 mA, adjustable · Error message 24 mA
Resolution 1000stepsor0.02mA
Load Max.200Ω
Binary input Notgalvanicallyisolated·Polaritycongurable
Binary output Normal polarity Floating · Galvanically isolated ·
Max.24VDC/50mA
Noshort-circuitprotection·Polaritycongurable
Applications Positioner The travel follows the input signal
PID controller Simplexedsetpointcontrol
Two-step mode Two-step behavior, control over binary input
Display Icons for functions and codes; with backlight
Rotary pushbutton Operating control for on-site operation to select and con-
rmcodesandvalues
Interfaces Standard RS-232 · For point-to-point connection to communication
participants or for memory pen · Permanently installed
Connection: RJ-12 connector socket at front
Motor deactivation By torque-dependent limit switches
Permissible temperatures 1)
Ambient 5 to 60 °C
Storage –25 to 70 °C
Ambient conditions 5to95%relativehumidity,nodewformation
Degree of protection acc. to EN 60529 IP 54 with cable entries
IP 65 with cable glands
Suspended mounting position not approved according to
EN60664
1) The permissible medium temperature depends on the valve on which the electric actuator is mounted. The limits in
the valve documentation apply.

12 EB 8331-4 EN
Installation
Class of protection II according to EN 61140
Degree of contamination 2accordingtoEN61010
Overvoltage category II according to EN 61010
Noise immunity AccordingtoEN61000-6-2
Noise emission AccordingtoEN61000-6-3
Mechanical environmental conditions Class 1M2 according to EN 60721-3-1:1998
Class 2M1 according to EN 60721-3-2:1998
Class 3M4 according to EN 60721-3-3:1998
Class 4M4 according to EN 60721-3-4:1998
Compliance ·
Materials Housingandcover:Plastic(glass-berreinforcedPPO)
Actuator stem: 1.4104
Additional electrical equipment
Limit contacts Mechanical Two adjustable limit contacts with changeover contacts;
230 V AC, 1 A · Without contact protection
Electronic Two adjustable limit contacts with relay and changeover
contacts; 250 V AC, 1 A · Without contact protection
3 Installation
3.1 Mounting position
The control valve can be installed in the
pipelineinanydesiredposition.However,a
suspended mounting position of the actuator
isnotpermissible(seeFig.1).
Fig.1: Mounting position

EB 8331-4 EN 13
Installation
3.2 Attachment to valve
3.2.1 Construction with inte-
grated yoke
Fig.2A:
Attachment to
– Series V2001 Valves (DN 15 to 80)
– Type 3260 (DN 65 to 150)
– Type 3214 (DN 65 to 100)
1. Remove protective covers and unscrew
nut (6) from the valve.
2. Connect the power supply as described
insection4onpage15.
3. Retract actuator stem (3) as described in
section 6.
4. Place actuator on yoke and fasten tight
usingnut(6,36mmwidthacrossats)
(tighteningtorquemin.150Nm).
5. Whentheplugstem(5)tscloselyonto
the actuator stem (3), attach both stem
connector clamps (4) and fasten with
screws.
3.2.2 Construction with ring
nut
Fig.3B:
Attachment to Series 240 Valves
1. Slide plug stem down to close the valve.
2. Turn the stem connector nut (8) until the
measurementx=75mm(DN100and
larger: x = 90 mm) from the top of the
yoke to the head of the stem connector
nut (8) is achieved. Lock this position
with the lock nut (9).
Types 3374-10/-11/-21/-31
Connection with yoke
Attachment to Series V2001 Valves,
Type 3260 (DN 65 to 150),
Type 3214 (DN 65 to 100)
A
1
2.1
3
4
5
6
1 Actuator
2.1 Actuator yoke
2.2 Valve yoke
2.3 Bonnet
3 Actuator stem
4 Stem connector
5 Plug stem
6 Nut
7 Ring nut
8 Stem connector nut
9 Lock nut
10 Travel indicator scale
Fig.2: Attachment to the valve

14 EB 8331-4 EN
Installation
3. Connect the power supply as described
in section 4.
4. Retract actuator stem (3) as described in
section 6.
5. Place actuator onto the valve bonnet
(2.3) and secure using the ring nut (7).
6. When the stem connector nut (8) rests on
the actuator stem, attach both stem con-
nector clamps (4) and fasten with screws.
7. Move actuator stem (3) to the end posi-
tion (valve closed) as described in sec-
tion6.
8. Align travel indicator scale (10) with the
middle of the stem connector (4) and
screw tight.
Fig.3C:
Attachment to Type 3214 Valve (DN 125 to
250)
1. Connect the power supply as described
in section 4.
2. Retract actuator stem (3) as described in
section 6.
3. Place actuator onto the valve and secure
using the ring nut (7). If necessary, re-
tract the actuator stem slightly before-
hand.
4. Whentheplugstemtscloselyontothe
actuator stem (3), attach both stem con-
nector clamps (4) and fasten with screws.
5. Move actuator stem (3) to the end posi-
tion (valve closed) as described in sec-
tion6.
6. Align travel indicator scale (10) with the
middle of the stem connector (4) and
screw tight.
Types 3374-15/-26/-36
Connection with ring nut
Attachment to Series 240 Valves
B
x
1
2.3
7
3
4
8
9
10
5
Types 3374-15/-26/-36
Connection with ring nut
Attachment to Type 3214 Valve (DN 125 to
250)
C
1
2.2
7
3
10
4
5
Fig.3: Attachment to the valve

EB 8331-4 EN 15
Electrical connections
4 Electrical connections
DANGER!
Risk of electric shock
For electrical installation, observe the
relevant electrotechnical regulations
concerning low-voltage installations
according to DINVDE0100 as well
as the regulations of your local
power supplier and the accident pre-
vention regulations that apply in the
country of use.
−Only use a suitable power supply
which guarantees that no danger-
ous voltages reach the device in
normal operation and in the event
of a fault in the system or any other
system parts.
41 44 42 51 54 52
–
+
+
–
+
–
+
–
+
+
–
B OUT
B OUT
B IN
B IN
+
+
–
+
+
–
+
+
–
I OUT
U/I OUT
U OUT
U IN
U/I IN
I IN
0(2) ... 10 V
0(2) ... 10 V
0(4) ... 20 mA
0(4) ... 20 mA
L
N
+/~
–/~
41 44 42 51 54 52
Options
Binary output
Input
Output
Binary input
Mechanical limit contacts
Power supply
depending on version
24 V AC, 24 V DC,
85 to 264 V AC
Electronic limit contacts
Fig.4: Electrical connection
Establish electrical connections as illustrated
inFig.4.Guidethecablestotheplug-inter-
minals from the top. The following cables and
stranded wires can be used:
Cable Cross section
Single-wireH05(07)V-U 1) 0.2 to 1.5 mm²
Fine-wireH05(07)V-K 1) 0.2 to 1.5 mm²
With wire-end ferrule acc. to
DIN46228-1 0.25 to 1.5 mm²
With wire-end ferrule and
sleeveacc.toDIN46228-4 0.25 to 0.75 mm²
1) 8 mm stripped insulation at cable end

16 EB 8331-4 EN
Putting the actuator into operation
5 Putting the actuator into op-
eration
1. Mount the actuator onto the valve. Refer
to section 3.2.
2. Onstartinguptheactuatorfortherst
time, the start screen and the error read-
ing E00 "RUNT" (no initialization per-
formed) appear in alternating sequence.
RefertoFig.10onpage25.
3. Initialize the actuator. Refer to sec-
tion12.3onpage33.
4. Congureactuatorbychangingparame-
ter settings. Refer to section 13 on
page37.
6 Manual override
The manual override is used to move the ac-
tuator stem manually and is only available
for actuators without fail-safe action.
ÎDo not operate the manual override
while the actuator is running and only
when the power supply is disconnected.
The hex wrench cannot be used for manual
override in actuators with fail-safe action.
ÎThe actuator stem in this case can only
be moved by placing the actuator into
MAN mode. Refer to section 6.2.
6.1 Mechanical override (only ac-
tuators without fail-safe ac-
tion)
To operate the manual override, place a
4mmhexwrenchontheredactuatorshaft
located at the side of the housing. The hex
wrench is included in the scope of supply. It
is attached to the bottom of the housing.
6.2 Moving the actuator stem
manually
First place the actuator into MAN mode to
move the actuator stem manually. The oper-
ation and selection of the operating mode
are described in section 12.1 on
page31.

EB 8331-4 EN 17
Mechanical limit contacts
7 Mechanical limit contacts
7.1 Installing the limit contacts
Note:
When ordering, state the congura-
tion ID (Var.-ID) and the type desig-
nation of the actuator. Both specica-
tions are written on the nameplate.
Refer to section 17.2 on page70.
Required accessories:
Toinstallthelimitcontacts,theretrotkit(or-
der no. 1402-0898) is required.
3 Serrated ring
8 Spacer
9 Retaining ring
16 Screw
17 Terminal board (similar to the
illustration shown)
18 Adjustment gear
19 Contact cam
20 Cam holder
Note:
The contact cams (19) are ready-mounted to the cam
holder (20) and the retaining rings (9) to form the con-
tact cam unit (21, see Fig.8).

9 (2x) 16 (2x)3 8
20
17
18 (2x) 19 (2x)
Fig.5: Accessories order no. 1402-0898
Installing limit contacts (Fig.6 to Fig.8):
DANGER!
Risk of electric shock
When installing electrical equipment,
make sure the power supply is
switched off and the signal input is
disconnected rst.
Tip:
We recommend applying a small
amount of lubricant (e.g. Vaseline) to
the spindles on the gear faces and to
the sides of the cogs.


18 EB 8331-4 EN
Mechanical limit contacts
Note:
To undo the screws on the housing
cover, use a Pozidriv PZ2 screwdriver
to get enough hold on the screw
heads.
1. Undo screws on housing cover and take
the cover off the actuator.
2. Move the actuator stem to the end posi-
tion depending on the fail-safe action
"Actuator stem extends" or "Actuator
stemretracts".Refertosection6.
3. Remove serrated ring and shim from
spindle (11).
4. Slide adjustment gears (18) onto their
spindles and fasten with one screw (16)
each. Check whether the adjustment
gears can be turned easily. If not, slightly
loosen its screw again.
5. Turn contact cams (19) on the cam hold-
er(20)asillustratedinFig.6corre-
sponding with the position of the actua-
tor stem.
6. Slide the spacer (8) onto the spindle
(11). Make sure that the long wire of the
tension spring rests on the spacer and on
the intermediate gear.
7. Slide the contact cam unit (21) onto the
spindle corresponding with the position
of the actuator stem as illustrated in
Fig.7.Makesurethattheoutermostcog
of the contact cam unit engages in the
gearwheel of the intermediate gear (1).
In addition, the adjustment gears (18)
must engage properly in the correspond-
ing gears of the contact cam unit (21).
8. Secure the contact cam unit (21) and in-
termediate gear (1) with the serrated
ring (3); push down the serrated ring as
far as it will go.
9. Position the terminal board (17) at the
base of the support at a 45° angle (ap-
prox.) with the switches pointing towards
the gears. Swivel the upper end of the
terminal board towards the gears until
the board is in a vertical position and
properly engaged in the support.
10.Adjust limit contacts as described in sec-
tion 7.2.
11.Replacecover.Brieyturnthefastening
screws counterclockwise with a screw-
driver to center them. Then fasten down
the cover by tightening the screws.

B
B
Actuator stem
retracted extended
20
19
19
B
B
18 21 1
When actuator stem retracted
B
B
18 121
When actuator stem extended
Fig.6: Alignment of contact cam
and cam holder
Fig.7: Alignment of the contact cam unit

EB 8331-4 EN 19
Mechanical limit contacts
1 23
4
8
12
13
17 21
11
18
1 Intermediate gear
2 Spindle gear
3 Serrated ring
4 Tension spring
8 Spacer
11 Spindle
12 Actuator board
13 Sleeve
17 Terminal board
18 Adjustment gear
21 Contact cam unit
State on delivery:
Spindle (11) with
serrated ring and shim
Fig.8: Installing the limit contacts

20 EB 8331-4 EN
Electronic limit contacts
7.2 Adjusting the limit contacts
Note:
To undo the screws on the housing
cover, use a Pozidriv PZ2 screwdriver
to get enough hold on the screw
heads.
1. Undo screws on housing cover and take
the cover off the actuator.
2. Switch on power supply.
3. Move the valve, using manual override
or the "manual level" operating mode, to
the point at which the contact should re-
act.
4. Usethe4mmhexwrenchtoturnspindle
of the adjustment gears (18) for the up-
per limit contact or for the lower limit
contact until the associated contact cam
on the contact cam unit (21) triggers the
switch contact of the upper or lower mi-
croswitch on the terminal board (17).
5. Replacecover.Brieyturnthefastening
screws counterclockwise with a screw-
driver to center them. Then fasten down
the cover by tightening the screws.
8 Electronic limit contacts
8.1 Installing the limit contacts
Required accessories
To install the electronic limit contacts, the ret-
rotkit(orderno.1402-0591) is required.
Installing limit contacts:
DANGER!
Risk of electric shock
2.04Before installing electrical acces-
sories, switch off the power supply
and disconnect the signal input!
Note:
To undo the screws on the housing
cover, use a Pozidriv PZ2 screwdriver
to get enough hold on the screw
heads.
1. Undo screws on housing cover and take
the cover off the actuator.
2. Move the actuator stem to the end posi-
tion depending on the fail-safe action
"Actuator stem extends" or "Actuator
stemretracts".Refertosection6.
3. Connect connecting cable to the plug-in
location intended for it on the board.
4. Position the terminal board (17, see
Fig.8)atthebaseofthesupportata
45° angle (approx.) with the relay point-
ing towards the edge of the intermediate
board. Swivel the upper end of the termi-
nal board until the board is properly en-
gaged.

