Servomotors
Servomotor 4-20 mA
20
© Lutz-Jesco GmbH 2017
BA-20710-02-V05
Chlorine control valve
C 7700
Operating instructions
8.3 Servomotor 4-20 mA
8.3.1 Technical data
Description
Value
Voltage supply
230 V ±10 %, 50/60 Hz ±5 %, optional:
115 V AC or 24 V AC (see rating plate)
Power consumption
7 VA
Protection class
IP 65
Actuating time
30 s (optionally other times, see rating
plate)
Regulation signal
4-20 mA (internal working resistance
250 ohms)
Position feedback
4-20 mA (max. working resistance
500 ohms)
Regulation bevel
90°
Torque
10 Nm
Switching capacity of the
fault signalling relay
Max. 125 V AC/DC
Max. 10 VA
Table 18: Technical data 4-20 mA
8.3.2 Circuit diagram and terminal connection
Fig. 15: Circuit board 4-20 mA
Item
Description
A
SR microswitch (valve open)
B
SL microswitch (valve closed)
C
Fault signalling relay
Table 19: Elements on the circuit board
Item
Description
D
Status display LEDs
E
Potentiometer hysteresis
F
Signal connections 20 mA input and output
G
Programming keys
H
DIP switch operating mode Man/AUTO and operating direction
I
Voltage supply input
Table 19: Elements on the circuit board
Fig. 16: Circuit diagram for circuit board 4-20 mA
Terminal
Function
PE
Protective earth (on
housing)
Voltage supply
N
N
Neutral conductor
L
L
Phase
51
-
Input 4-20 mA
These two signals
are located on a
shared potential
52
+
54
-
Position feedback
4-20 mA
55
+
56
Relay "fault", NC,
open = fault
Interrupts in case of a
power failure due to
wire breakage,
control signal or
manual mode
57
All other terminals are used internally.
Table 20: Terminal connection 4-20 mA
A
C
B
D
E
F
G
I
H
