7.6
Limit and torque switches
Only the same potential can be switched on the two circuits (NC/NO
contact) of a limit or torque switch. If different potentials are to be switched
simultaneously, tandem switches are required.
To ensure correct signalisation, the leading contacts of the tandem switches
must be used for that purpose and the lagging contacts for switching off.
7.7
Fitting the cover
After connection:
.
Insert the socket carrier (51.0) into the plug cover (50.0) and fasten it with
screws (51.01).
.
Clean sealing faces at the plug cover and the housing.
.
Check whether O-ring is in good condition.
.
Apply a thin film of non-acidic grease (e.g. petroleum jelly) to the sealing
faces.
.
Replace plug cover (50.0) and fasten bolts (50.01) evenly crosswise.
.
Fasten cable glands with the specified torque to ensure the required
enclosure protection.
13
Multi-turn actuators SAN 07.1 – SAN 25.1/SARN 07.1 – SARN 25.1
Operation instructions
for valve automation in nuclear power plants
R
D
B
K
R
D
B
K
B
K
2
RD 2
B
K
R
D
B
K
2
RD 2
B
K
R
D
DSR 1 / DÖL 1
WSR 1 / WÖL 1
DSR / DÖL
WSR / WÖL
Figure G-5
I
Single switch
II
Tandem switch
Mechanical
Lifetime = 2 x 10
6
starts
Type of current
Switch rating I
max
30 V
125 V
250 V
1-phase AC
(ind. load) cos phi = 0.8
5 A
5 A
5 A
DC
(resistive load)
2 A
0.5 A
0.4 A
with gold plated
contacts
min. 5 V, max. 30 V
Current
min. 4 mA, max. 100 mA
Table 5: Technical data limit and torque switches
NO
NC
NC
NO
