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1FläktGroup DC_8783GB 20180126_R0 We reserve the right to make changes without prior notice
For operation of Siemens valves with 5.5 mm stroke for
water-side control of hot water and cooling water in heating,
ventilation and air conditioning systems.
FUNCTION/MECHANICAL DESIGN
The reversible synchronous motor is driven by a proportional
DC 0...10 V, DC 4...20mA or 0…1000 Ω control signal. The stroke
is generated via an antilocking gear train.
DC 0...10V,4...20MA 0…1000 Ω CONTROL SIGNAL
• The valve opens / closes in proportion to the control signal at
Y or R.
• DC 0v,4mA or 0 Ω the valve is closed (A → AB).
• When power supply is removed, the actuator maintains its
current position.
SELECTING THE FLOW CHARACTERISTIC
Connector S1 (under the cover, on the printed circuit board)
can be repositioned to change the flow characteristic of valves
from «equal percentage» to «linear»; in all cases the flow
characteristic relates to the throughport of the valve.
CE CONFORMITY
EMC directive 2014/30/EU
LVD directive 2014/35/EU
POSITIONING SIGNAL AND FLOW CHARACTERISTIC SELECTION
Positioning signal
"Y"
Position
feedback "U" Flow characteristic
OFF
2) DC 0...10 V DC 0...10 V
log =
equal-
percentage
ON
DC 4...20 mA DC 0...10 V
lin =
linear
2) Factory setting: All DIL switches set to OFF
DIL switches
Operation
Climatic conditions
Mounting location
Temperature general
Humidity (noncondensing)
IEC 60721-3-3
Class 3K5
Indoors, outdoors
1)
-5...55 °C
5...95 % r. h.
Transport
Climatic conditions
Temperature
Humidity
IEC 60721-3-2
Class 2K3
-25...70 °C
<95 % r. h.
Storage
Temperature
Humidity
IEC 60721-3-1
-15...55 °C
5...95 % r. h.
1) Outdoors always with weather shield ASK39.2,
housing protection IP54 remains unchanged.
Y,Z
0 10 V
4 20 mA
0 1000 Ω
lin
log
DATASHEET
ELECTROMOTORIC ACTUATORS
STCZ-50
CONTROL EQUIPMENT
FläktGroup DC_8783GB 20180126_R0 We reserve the right to make changes without prior notice
2
TECHNICAL DATA
Operating voltage 24 VAC ± 20 %
Frequency 50Hz
Power consumption 5,3VA (4,5VA neutral posision)
Parallel operation of actuators max 10
Positioning time (opening/closing) 30 s
Positioning force 400 N
Nominal stroke 5,5 mm
Admissible temperature of medium in the valve 1…130 °C
(short-time up to 150 °C).
Cable entry 1st Ø20,5mm(M20)
Protection class IP54
Weight with packaging 0,4 kg
Actuator housing plastics
Housing cover and manual adjuster plastics
Gear train and stem with coupling plastics
FEATURES AND BENEFITS
• Electromotoric actuator, maintenance-free
• Reversible synchronous motor
• Antilocking gear train
• Load-dependent switch-off in stroke limit positions
The actuators must be electrically connected in accordance
with local regulations and the connection diagrams.
Safety regulations and restrictions designed to ensure the
safety of people and property must be observed at all times.
COMMISSIONING
When commissioning the system, check wiring and the func-
tions. In addition, select or check the auxiliary switch settings.
MANUAL ADJUSTER
Switching off the positioning signal.
The valve can be fully closed (= 0 % stroke) by turning the manual
adjuster counterclockwise. Control is automatically resumed
when the positioning signal returns.
MAINTENANCE
The actuators are maintenance-free.
When servicing the actuator:
• Switch off pump and power supply.
• Close the main shutoff valve in the pipework.
• Release pressure in the pipes and allow them to cool down
completely.
• If necessary, disconnect electrical connections from
the terminals.
The actuator must be correctly fitted to the valve before recom-
missioning.
The actuator can not be repaired. It has to be replaced as a
complete unit.
A DIL switches
B Connection terminal
Signal inputs
Y positioning signal DC 0...10 V/DC 4...20 mA/0...1000 Ω
Input impedance ≥ 100 k Ω
Power consumption ≤ 0.1 mA
DISPOSAL
The device contains electrical and electronic
components and must not be disposed of
together with domestic waste. This applies in
particular to the PCB.
Legislation may demand special handling of
certain components, or it may be sensible
from an ecological point of view. Current local
legislation must be observed.
CONTROL EQUIPMENT
FläktGroup DC_8783GB 20180126_R0 We reserve the right to make changes without prior notice
3
DIMENSIONS CONNECTION TERMINALS
AC/DC 24 V. DC 0... 10 V/4... 20 mA/0... 1000 Ω
System neutral (SN)
System potential (SP)
Positioning signal for DC 0... 10 V/4... 20 mA
Measuring neutral
Position feedback DC 0... 10 V
Positioning signal forced control AC/DC ≤ 24 V, 0... 1000 Ω
Dimensions in mm, weights in kg
1. M16
2. M20
A B C C1 C2 D E Kg
151 80 93 21.9 71.1 29.9 21.8 100 200 0.40
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