Servomotors
Servomotor 3-point step
19
© Lutz-Jesco GmbH 2017
Subject to technical changes.
170518
BA-20710-02-V05
Chlorine control valve
C 7700
Operating instructions
Item
Description
A
SL microswitch (valve closed)
B
SR microswitch (valve open)
C
Microswitch outputs
D
Voltage supply input
E
Feedback potentiometer output
Table 15: Elements on the circuit board
Fig. 13: Circuit diagram for circuit board 3-point step
Terminal
Function
PE
Protective earth (on
housing)
Voltage supply
1
N
Neutral conductor
2
L
Close phase valve
3
L
Open phase valve
4
L
Closed end position
Voltage output
5
L
Open end position
18
Resistance start
Feedback potentiom-
eter (observe max.
load)
19
Driver
20
Resistance end
N, B, A
Used internally
Table 16: Terminal connection 3-point step
8.2.3 Limit switch adjustment
i
The servomotor in its delivery state is adjusted to a setting
range of 0-100 %. A different setting is only useful in special
cases.
Before you change anything on the servomotor, check if the
counternut of the adjusting spindle is tightened securely.
Fig. 14: Limit switch
Item
Description
Function
NL
Trigger cam left end position
Valve closed
SL
Switch for left end position
NR
Trigger cam right end position
Valve open
SL
Switch for right end position
Table 17: Limit switch
Both trigger cams (NR, NL) move with the main shaft. You activate the
limit switches (SR, SL). The rotary selector switches can be adjusted by
hand without tools.
After adjusting the limit switches, the motor must move to both end
positions. This allows the slip coupling of the potentiometer to adjust
itself.
i
The regulation bevel of the motor is 90° for a dosing capacity
of 0-100 %. If the regulation bevel is greater, the feedback
potentiometer will shift during operation.
