The LA 724i SSR is the high-current power output module for controlling external solid-state relays (up to 90 A/load).

Connection of 24 V power supply
Connection of solid-state relays via front plug
Connection of external current measuring module
Connection of voltage feedbacks from the load circuits
Connection of phases L1, L2, L3 and zero conductor via busbars
(only required with voltage diagnostics)

Output power

Monitoring of supply voltage

The connected 24-V supply is monitored for failure. The outputs to the solid-state relays are switched off in the event of a failure.

The drivers of the control outputs are monitored for correct functioning.

External fuses must be provided for each channel.

Two different diagnostics methods are possible as alternatives:

The following faults can be detected by diagnostics of the voltages from the load circuit:
- SSR cannot be switched on, interruption in line to SSR, or external channel fuse blown
- SSR cannot be switched off, interruption in heat emitter or line
The following faults can be detected in addition by diagnostics using the external current measuring module:
- Rated power on channel exceeded
- Rated power on channel fallen below

This diagnostics is recommended for fault detection with radiators connected in parallel.

LA 724i SSR power output module
Outputs per load control (LA 724i SSR)	24
Electrical isolation from control unit	By optocoupler specified according to VDE 0884
Insulation voltage of optocoupler	5.3 kV
Electrical isolation between diagnostics inputs	No
Diagnostics voltage (for star and delta connections)
Rated value	230 V AC / 400 V AC
Permissible range	187 V ... 264 V / 340 V ... 460 V
Frequency	50 Hz/60 Hz (47 Hz ... 63 Hz)
Total current per phase and module	See current measuring module
Current per busbar	Max. 120 A
24 V power supply for control of SSR
Rated value	24 V
Permissible range	20.4 V ... 28.8 V
Fuse	1.5 A/250 V fast-blow (external)
Control voltage	24 V
With rated power supply	Typ. 23.3 V Min. 22 V
Control current	Max. 50 mA per control output
Line lengths
Control line to SSR	Max. 30 m
Line to SM 724i	Max. 30 m
24 V power supply	Max. 10 m Note: routing of lines not outside buildings
Dimensions of LA 724i SSR (W x H x D)	50 mm x 480 mm x 210 mm
Weight, approx.	3.3 kg

Order No.	Description
6BK1 700 ‑ 2BA40 ‑ 0AA0	SM 724i current measuring module
Part No. A5E00210675	Mating connector for 24 V power supply
Part No. A5E00043661	Mating connector for connection of SSR (3 required per LA)
Part No. A5E00210670	Mating connector for connection of current measuring module
Part No. 41818384	Mating connector for voltage diagnostics (3 required per LA)
6ES7 171 ‑ 3AA00 ‑ 0AA0	Fan module for HS 724 Required with powers greater than 650 Watt per channel on LA 724
6ES7 171 ‑ 2XX00 ‑ 6DA0	Heater control busbar, only required with voltage diagnostics

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

Заказной №	Описание	Вес (кг)	Доставка	Мин. зак. (шт)
6BK1700-2BA10-0AA0	LA 724 УПРАВЛЕНИЕ НАГРЕВОМ СИЛОВОЙ ВЫХОД НА ЦЕНТР. СХ. ZA 724 SSR-ВЕРСИЯ	3.5	6 - 8 недель (C)	1

Заказной №	Описание	Вес (кг)	Доставка	Мин. зак. (шт)
6BK1700-2BA40-0AA0	SM 724I К HS 724I МОЖЕТ ОПЦИОНАЛЬНО С LA 724ISSR ПРИМЕНЯТЬСЯ ДЛЯ ДИАГНОСТИКИ ПАРАЛЛЕЛЬНЫХ ЦЕПЕЙ.	1.25	6 - 8 недель (C)	1
6ES7171-2XX00-6DA0	УПРАВЛЕНИЕ НАГРЕВОМ-ТОКОВЫЕ ШИНЫ КАК ЗАП. ЧАСТЬ	0.022	6 - 8 недель (C)	1
6ES7171-3AA00-0AA0	МОДУЛЬ ВЕНТИЛЯТОРА ДЛЯ HS 724, ТРЕБУЕТСЯ ПРИ МОЩНОСТЯХ БОЛЬШЕ 1000 ВАТТ НА КАНАЛ НА LA724	0.82	по запросу (D)	1