Belimo S2A-F Instruction Manual

Technical data sheet S2A-F
Auxiliary switch unit, suitable for the
spring return actuators NF..A.., SF..A..,
LF..
• two switches (SPDT)
• Adjustable switching points
• including adapter
Technical data
Electrical data Auxiliary switch 2 x SPDT, 0...100%, adjustable
Switching capacity auxiliary switch 1 mA...3 (0.5 inductive) A, AC 250 V (II
reinforced insulation), 1 mA…0.5 (0.2 inductive;
L/R = 3.4 ms) A, DC 110 V (II reinforced
insulation)
Switching points auxiliary switch Adjustable across the entire range of rotation
0...1 of the actuator. Presetting with scale
possible.
Connection auxiliary switch Cable 1 m, 6 x 0.75 mm²
Safety Protection class IEC/EN II reinforced insulation
Degree of protection IEC/EN IP54
EMC CE according to 2014/30/EU
Low voltage directive CE according to 2014/35/EU
Certification IEC/EN IEC/EN 60730-1 and IEC/EN 60730-2-14
Mode of operation Type 1.B
Control pollution degree 3
Ambient temperature -30...50°C
Storage temperature -40...80°C
Ambient humidity Max. 95% r.H., non-condensing
Maintenance Maintenance-free
Weight Weight 0.25 kg
Safety notes
!
• The device must not be used outside the specified field of application, especially not
in aircraft or in any other airborne means of transport.
• Only authorised specialists may carry out installation. All applicable legal or
institutional installation regulations must be complied during installation.
• The device may only be opened at the manufacturer’s site. It does not contain any
parts that can be replaced or repaired by the user.
• Cables must not be removed from the device.
• The device contains electrical and electronic components and must not be disposed
of as household refuse. All locally valid regulations and requirements must be
observed.
www.belimo.com S2A-F • en-gb • 2019-04-12 • subject to changes 1

Mode of operation A carrier plate uses adaption to make a positive fit on the spring-return actuator and
transfers the rotary movement directly to the feedback potentiometer.
Switching points can be freely selected with an adjustment dial. The current switch
position can be read off at any time.
Application The auxiliary switch unit is used for signaling the position or for exercising switching
functions in any given angle setting.
Simple direct mounting The auxiliary switch unit is connected directly by means of adaption with the hollow
shaft (LF.., NF..A.., SF..A..) of the actuator. Once it is mounted, the unit is screwed to
the actuator.
The spindle clamp is mounted on the bottom side.
Electrical installation
Wiring diagrams
S1 S2 S3 S4 S5 S6
S1 S2 S3 S4 S5 S6
S2A
S1 S2 S3 S4 S5 S6
0...100%
Cable colours:
S1 = violet
S2 = red
S3 = white
S4 = orange
S5 = pink
S6 = grey
S2A-F Auxiliary switch unit, suitable for the spring return
actuators NF..A.., SF..A.., LF..
Product features
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S2A-F • en-gb • 2019-04-12 • subject to changes
2

Note: Perform settings on the auxiliary switch only in deenergised state.
1Manual adjusting
Connect the actuator and move it into the desired position.
2Auxiliary switch 1
Turn rotary knob until the arrow points to the vertical line.
The arrow direction always indicates the switching position (S1-S2 or S1-S3).
If the auxiliary switch should switch in the opposite direction, rotate the auxiliary switch rotary
knob by 180°. Alternatively the switching position can be checked with a continuity tester
on the cable of the auxiliary switch.
3Auxiliary switch 2
Turn rotary knob until the arrow points to the vertical line.
Turn the spindle clamp 2and consider the arrow direction of the auxiliary switch rotary knob at
the same time.
The arrow direction always indicates the switching position (S1-S2 or S1-S3).
If the auxiliary switch should switch in the opposite direction, rotate the auxiliary switch rotary
knob by 180°. Alternatively the switching position can be checked with a continuity tester
on the cable of the auxiliary switch.
Release (or disengage) button 1.
4Auxiliary switch - 2
Same procedure as for auxiliary switch 1 (step 1to 2).
1
2 3
Note: Perform settings on the auxiliary switch only in deenergised state.
1Manual override control
Turn the hand crank until the desired switching position is set.
2Fasten the locking device
Turn the locking switch to the «Locked padlock» symbol.
3Auxiliary switch 1
Turn rotary knob until the arrow points to the vertical line.
The arrow direction always indicates the switching position (S1-S2 or S1-S3).
If the auxiliary switch should switch in the opposite direction, rotate the auxiliary switch rotary
knob by 180°. Alternatively the switching position can be checked with a continuity tester
on the cable of the auxiliary switch.
4Unlock the locking device
Turn the locking switch to the «Unlocked padlock» symbol or unlock with the hand crank.
5Auxiliary switch 2
Same procedure as for auxiliary switch 1 (step 1to 4).
3 5
1
42
S2A-F Auxiliary switch unit, suitable for the spring return
actuators NF..A.., SF..A.., LF..
Operating controls and indicators
www.belimo.com S2A-F • en-gb • 2019-04-12 • subject to changes 3

40
8024
Dimensional drawings
58 40
105
7
155
74
96
18.5 81 40 7
108
214
126
96
20.5
LF..
NF..A.. / SF..A..
S2A-F Auxiliary switch unit, suitable for the spring return
actuators NF..A.., SF..A.., LF..
Dimensions [mm]
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S2A-F • en-gb • 2019-04-12 • subject to changes
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