Analog Output / Load Output X74 Pin 3; Cable Lengths; Cross-Sectional Areas; Connections Of Actuators - Siemens LMV37.4 Series Basic Documentation

Building Technologies

4.1.3 Analog output / load output X74 pin 3

Accuracy of output voltage

4.1.4 Cable lengths


Mains line AC 120 V / AC 230 V

Display, BC interface

Load controller X5-03

Load controller X64 (24 mA)

Safety loop / burner flange (total)

External lockout reset button

Safety valve

Load output ¹)

VSD control ¹)²)

Speed input

Fuel valve V1 / V2 / V3

Pilot valve

Ignition transformer

Other lines
¹) Do not run the cable together with other cables. If not observed, hum voltage might
cause electromagnetic interference
²) Shorter cable length due to closed control loop
Specification as per EN 60730-1
Type of shutdown or interruption of each circuit
Shutdown with microswitch
Mode of operation

4.1.5 Cross-sectional areas

The cross-sectional areas of the mains power lines (L, N, and PE) and, if required, the
safety loop (safety limit thermostat, water shortage, etc.) must be sized for rated
currents according to the selected external primary fuse.
The cross-sectional areas of the other cables must be sized in accordance with the
internal unit fuse (max. 6.3 AT).
Min. cross-sectional area
Cable insulation must meet the relevant temperature requirements and environmental
conditions.
Fuses (F1) used inside the LMV37.4

4.1.6 Connections of actuators

The ready connected actuator cables must not be extended.
Basic documentation LMV37.4...
4 Technical Data
±1%
Max. 100 m (100 pF/m)
For installation under the burner hood or
in the control panel
Max. 3 m (100 pF/m)
Max. 20 m (100 pF/m)
Max. 20 m (100 pF/m)
Max. 20 m (100 pF/m)
Max. 20 m (100 pF/m)
Max. 20 m (100 pF/m)
Max. 10 m (100 pF/m)
Max. 3 m (100 pF/m)
Max. 3 m (100 pF/m)
Max. 3 m (100 pF/m)
Max. 3 m (100 pF/m)
Max. 3 m (100 pF/m)
Max. 3 m (100 pF/m)
1-pole
Type 2 B
0.75 mm² (single-core or multi-core as per
VDE 0100)
6.3 AT DIN EN 60127 2 / 5
25/267
CC1P7546en
17.12.2018