Power output modules Siemens

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  • Modules enclosed in metal housing
  • Connection of the phases via conductor rails
  • Connection of the heat emitters by means of mating connectors (the heat emitter and mating connector must be ordered separately.)
  • Channel fuses at the front
  • Cooling is possible with the optional fan module for LA724I and LA724I HP power output modules, see "Fan module"
  • Internal parallel bus interface
  • 4 diagnostic LEDs for indicating channel/module faults

Функции



Power switching elements

LA724I and LA724I HP power output modules

  • Power triacs with zero crossover switching
  • Protection of triacs and opto-triacs against overvoltages by Transil diodes

LA724I SSR power output module

There are no power triacs here. The load is activated via external Solid State Relays (SSR).

Output power

LA724I power output module

  • 24 power channels of 230 V each (8 outputs per phase)
  • Max. 1 150 W switching capacity per output
  • Max. 7 360 W switching capacity per phase

LA724I HP power output module

  • 12 power output channels for 230 V/400 V (4 outputs per phase)
  • Max. 2 300 W/4 000 W switching capacity per output
  • Max. 9 200 W switching capacity per phase for star connection and max. 16 000 W switching capacity for delta connection

LA724I SSR power output module

24 channels with one digital control signal of 24 V (8 outputs per phase)

Forced ventilation

LA724I and LA724I HP power output modules

Depending on the switching capacity and ambient temperature, the power output modules may have to be forced ventilated. A fan module is available as an option for this purpose, see "Fan module".

For detailed information, refer to the "SIPLUS HCS724I Heater Control System" Operating Instructions, http://support.automation.siemens.com/WW/view/en/55336534.

Temperature monitoring

LA724I and LA724I HP power output modules

There is an NTC thermistor on the heat sink for monitoring its temperature. This temperature-dependent resistor outputs a signal to the SIMATIC S7‑300 at 92 °C ± 3 °C. A second switching threshold at 100 °C ± 3 °C switches off the power outputs of the module.

Supply voltage monitoring

LA724I SSR power output module

  • The connected 24 V DC supply is monitored for failure. In the event of a failure, the outputs to the Solid State Relay (SSR) are deactivated.
  • The drivers for the control outputs are monitored for correct functioning.

Fuses

LA724I power output module

  • Each power output has a 5 A fuse in a fuse holder that is accessible from the front to protect the power triac, and one 32 A fuse per phase to limit the phase current.

LA724I HP power output module

  • Each power output has a 10 A fuse in a fuse holder that is accessible from the front to protect the power triac, and one 40 A fuse per phase to limit the phase current.

LA716I SSR power output module

Protection for each channel is to be provided externally.

Diagnostics facilities

LA724I and LA724I HP power output modules

Diagnostics functions are provided as standard to detect the following faults:

  • Internal fuse defective or triac at high-resistance
  • Triac failed
  • External fault such as blown fuse, heat emitter or cable breakage

If several heat emitters are connected to one output in parallel, failure of an individual heat emitter is detected by means of extended diagnostics.

LA724I SSR power output module

Two different diagnostics methods are possible:

  • Diagnostics of voltages from the load circuit allows the following faults to be detected:
    • Solid State Relay (SSR) cannot be closed, supply line to the SSR is interrupted, or external channel fuse has ruptured
    • Solid State Relay (SSR) cannot be opened, break in emitter or wiring
  • Diagnostics using the external current measuring module (see "Current measuring module") allow the following faults to be detected in addition (these diagnostics are recommended for fault detection in emitters connected in parallel):
    • Rated voltage for channel has been exceeded
    • Rated voltage for channel has been undershot

Технические данные



Order number

 

6BK1700-2BA00-0AA0

6BK1700-2BA10-0AA0

6BK1700-4BA70-0AA0

Product designation

 

Power module LA724I

-

Power module LA724I HP

General technical data:

 

 

 

 

Control version / of heat emitters

 

Half-wave control

-

Half-wave control

Type of load

 

Ohmic load

Solid State Relay

Ohmic load

Supply voltage:

 

 

 

 

Type of voltage / of the supply voltage

 

AC

Supply voltage / with AC / Rated value

V

230

400

  • ● Relative negative tolerance / of the supply voltage

%

18

  • ● Relative positive tolerance / of the supply voltage

%

15

Supply voltage frequency

 

 

 

 

  • ● 1 / Rated value

Hz

50

-

50

  • ● 2 / Rated value

Hz

60

-

60

Relative symmetrical tolerance / of the supply voltage frequency

%

5

-

5

Switching capacity current

 

 

 

 

  • ● per busbar / maximum

A

120

  • ● per phase / maximum

A

32

-

40

Design of the electrical isolation

 

Optocoupler between main circuit and SELV/PELV

Power capacity / of the module

 

 

 

 

  • ● with delta connection / at 40 °C

 

 

 

 

  • — with fan / maximum

kW

NO_DATA

-

36.5

  • — without fan / maximum

kW

NO_DATA

-

22.6

  • ● with star connection / at 40 °C

 

 

 

 

  • — with fan / maximum

kW

22

-

21

  • — without fan / maximum

kW

14.4

-

13

Power capacity / maximum permissible

kW

22

-

48

Type of electrical connection / for supply voltage

 

Bus bar or ring cable lug

Power Electronics:

 

 

 

 

Number of outputs / for heating power

 

24

-

12

Number of heat emitters / per output / maximum

 

5

-

5

Output voltage

 

 

 

 

  • ● with star connection

V

230

-

230

  • ● with delta connection

V

NO_DATA

-

400

Design of the overvoltage protection

 

Transil diodes

-

Transil diodes

Power capacity / per output

 

 

 

 

  • ● maximum

W

1 150

-

4 000

  • ● minimum

W

75

-

75

Output current / at output / for heating power / Rated value

A

5

-

10

Design of short-circuit protection / for heating power / per output

 

Fuse 5 A

-

Fuse 16 A

Galvanic isolation / between the outputs

 

No

-

No

Type of electrical connection / at output / for heating and fan

 

Socket strip, 8-pole

-

Socket strip, 8-pole

Type of connectable conductor cross-section

 

 

 

 

  • ● for heating and fan

 

 

 

 

  • — solid

 

1x (0.2 ... 1.5 mm²)

  • — finely stranded / with core end processing

 

1x (0.2 ... 1.5 mm²)

-

1x (0.2 ... 1.5 mm²)

  • ● for AWG conductors / stranded

 

28 ... 16

-

28 ... 16

Inputs/ Outputs:

 

 

 

 

Control supply voltage / for DC / Rated value / minimum

V

-

20.4

-

Type of electrical connection / for control supply voltage

 

-

2-pin connector

-

Type of connectable conductor cross-section

 

 

 

 

  • ● for control supply voltage / with core end processing

 

-

1x (0.2 ... 1.5 mm²)

-

  • ● for AWG conductors / for control supply voltage

 

-

28 ... 14

-

Number of semiconductor outputs

 

-

24

-

Type of switching output

 

-

semiconductor output (high side switch)

-

Type of voltage / of output voltages

 

-

DC

-

Output voltage / for DC / Rated value

V

-

24

-

Output voltage

 

 

 

 

  • ● maximum

V

-

28.8

-

  • ● minimum

V

-

18.4

-

Output current / at digital output / for signal <1> / maximum

A

-

0.05

-

Galvanic isolation / between the outputs and system interface

 

-

No

-

Switching behavior

 

-

monostable

-

Property of the output / Short-circuit proof

 

-

Yes

-

Type of electrical connection / at the digital outputs

 

-

8-pin connector

-

Type of connectable conductor cross-section

 

 

 

 

  • ● at the digital outputs

 

 

 

 

  • — solid

 

-

1x (0.2 ... 1.5 mm²)

-

  • — finely stranded / with core end processing

 

-

1x (0.2 ... 1.5 mm²)

-

  • ● at the measurement inputs for voltage / for AWG conductors

 

-

28 ... 16

-

  • ● at the measurement inputs for current / solid

 

-

1x (0.2 ... 1.5 mm²)

-

Type of electrical connection / at the measurement inputs for current

 

Internal

externally via 6-pin connector for SM724I

Internal

Type of connectable conductor cross-section / at the measurement inputs for current

 

 

 

 

  • ● solid

 

-

1x (0.2 ... 1.5 mm²)

-

  • ● finely stranded / with core end processing

 

-

1x (0.2 ... 1.5 mm²)

-

  • ● for AWG conductors

 

-

28 ... 14

-

Diagnostics voltage

 

 

 

 

  • ● with star connection / Rated value

V

-

230

-

  • ● with delta connection / Rated value

V

-

400

-

Type of electrical connection / at the measurement inputs for voltage

 

-

Socket strip, 8-pole

-

Type of connectable conductor cross-section / at the measurement inputs for voltage

 

 

 

 

  • ● solid

 

-

1x (0.2 ... 1.5 mm²)

-

  • ● finely stranded / with core end processing

 

-

1x (0.2 ... 1.5 mm²)

-

  • ● for AWG conductors

 

-

28 ... 16

-

Installation/ mounting/ dimensions:

 

 

 

 

Width

mm

50

Height

mm

480

Depth

mm

210

Further information:

 

 

 

 

Number of status displays

 

4

Display version / as status display by LED

 

1 LED green = LA status indicator, 3 LEDs red = fault indicator LA per phase

Design of the power supply

 

Power supply via central connection

Product function / Temperature monitoring

 

Yes

-

Yes

Type of the temperature monitoring

 

NTC thermistor

-

NTC thermistor

Diagnostics function

 

 

 

 

  • ● Cable break

 

Yes

  • ● Heat emitter failure

 

Yes

  • ● Tripped fuse

 

Yes


Дополнительно



Design

for power output module

Type

Mating connectors

  • for connection of heat emitter
    (3 units required for each power output module)

LA724I, LA724I HP

40018384

  • for the 24 V DC supply

LA724I SSR

A5E00210675

  • for connection of Solid State Relay (SSR)
    (3 units required for each power output module)

LA724I SSR

A5E00043661

  • for connecting the current measuring module

LA724I SSR

A5E00210670

  • for voltage diagnosticss
    (3 units required for each power output module)

LA724I SSR

41818384

Data link

  • 5 A quick blow/250 V

LA724I

200021116

  • 16 A slow blow/500 V
    (3 units required for each power output module)

LA724I HP

A5E01204540



Recommended Solid State Relay (SSR)

SIRIUS SC semiconductor relay/contactor,
e.g. 3RF2350‑1AA02:
semiconductor contactor 50 A,
40 °C,
control voltage 24 V,
screw connection