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2. Controllers with electric actuators
8 EB 5766 EN
Design and principle of operation
Type
5757 5724 5725
5757-7 5757 -10 -13 -20 -23 -10 -13 -20 -23
Nominal size DN 15 to 25 15 to 25 15 to 25 32 to 50 15 to 25 32 to 50
Scope of application Heating
DHW heating in instantaneous heating systems,
fixed set point control circuits in mechanical engineering
Safety function Without Without With
Rated travel mm 6 6 6 12 12 6 6 12 12
Transit time for rated travel s 20 35 18 70 35 35 18 70 35
Transit time upon fail-safe
action
s – – 4466
Fail-safe action – – Stem extends
Nominal thrust kN 0.3 0.7 0.5
Manual override Yes Yes Possible
1)
Power supply 230 V (±10 %), 50 Hz
Power consumption approx. VA 3 3 37375959
Permissible temperatures
Ambient °C 0 to 50 0 to 50 0 to 50
Storage °C –20 to 70 –20 to 70 –20 to 70
At connecting rod °C 0 to 110 0 to130 0 to 130
Degree of protection IP 42 IP 54 (upright position, acc. to DIN IEC 529)
Inputs and outputs of the digital controller
Temperature sensor Pt 1000 3 x 1 x 1 x 1 x
Setting range °C 1 to 150 0 to 150 1 to 150 1 to 150
Potentiometer input
1000 to
1100/2000
Ω
–– –
Water flowmeter input – 530 pulses/l 530 pulses/l 530 pulses/l
Current input – 4 (0) to 20 mA 4 (0) to 20 mA 4 (0) to 20 mA
Binary input BE1
2)
Op. mode
switchover
Switching between internal set points/
Deactivation of function to maintain temperature constant
Binary input BE2
2)
– Flow switch
Binary output BA
230 V/50 Hz
Cir. pump/Ex
-
ternal demand
–– –
1)
Manual override using a 4 mm hex screwdriver (after removing the housing cover);
always returns to fail-safe position after safety release.
2)
Recommendation for Type 5724, Type 5725 and Type 5757: With gold contacts