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Siemens Building Technologies
Elctromotoric Actuators
CA1N4865en
HVAC Products
20.04.2011
Type summary
Prod. no.
Operating voltage
Positioning time
Control signal
Connecting cable
SFP21/18
AC 230 V
SFP71/18
AC 24 V
10 s
2-position
1.8 m
Prod. no.
Description
Switching point
Switching capacity Connecting cable
ASC2.1/18
Auxiliary switch
open/closed
At approx. 50% stroke
AC 250 V / 3(2) A
1.8 m
Ordering
Actuators, valves and accessories are supplied separately. The actuator is supplied
with the AL50 ring.
See overview
Equipment combinations
Type code
Valve type
k
vs
PN class
Data sheet
[
m
3
/h
]
VVP47..
2-port valves
0.25...4.0
VXP47..
3-port valves
0.25...4.0
VMP47..
3-port valves with T-bypass
0.25...2.5
PN16 4847
Technical design / Mechanical design
The valve is opened electrically by the actuator and closed by spring force.
It incorporates a synchronous motor, a gear mechanism and a return spring.
The electric motor is overload-resistant and anti-locking, so that continuous operation is
possible. The maximum stroke is limited mechanically. The closing motion, by contrast,
includes an overrun for the gear mechanism. This protects the gear mechanism from
mechanical shock and increases service life.
The valve is connected by an 1.8 m cable, which is an integral part of the actuator.
Accessories
The optional auxiliary switch can be fitted to the actuator
with two screws.
It switches at a stroke of approx. 50 %.
•
Valve actuator de-energized:
→
Auxiliary switch open
•
Voltage applied to valve actuator:
→
Auxiliary switch closed (50 ... 100 % stroke)
•
Manual adjuster locked into position
(approx. 90 % stroke):
→
Auxiliary switch closed
01468
See "Technical data" for further information on the auxiliary switch, page 5.
Accessories
Example:
Product number
Stock number
Designation
Quantity
SFP71/18 SFP71/18 Electromotoric
Actuators
2
ASC2.1/18 ASC2.1/18 Auxiliary
Switch
1
Delivery
Rev. no.
ASC2.1/18
auxiliary switch
