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Relay Unit 490 2 × 2.3 A Blinds Controller


 2-Channel Blinds Controller (490)

The 2-Channel Blinds Controller is a DALI-compatible interface unit that allows control of blinds and curtains in a DIGIDIM lighting control system. The blinds controller is a DIN-rail mounted unit that provides two independent control channels, each with two single-pole, volt-free contacts for switching up to 550 W up/down or power direction motors from a DIGIDIM system.

The unit has a status LED, a physical selection switch and relay-state indicators. The status LED provides status and a fault indication. The physical selection switch is used to identify the device during system configuration. The relay-state indicator LEDs are illuminated when the respective relay is closed.

Note: This unit does not contain a DALI power supply. Therefore, one must be present elsewhere in the system.

Connection details DALI Supply wiring Load wiring




 Key Features

  • Up/Down mode operates in a ‘Break before Make’ manner to prevent motor damage.
  • Relays are internally isolated permitting separate mains phases to be used for each control channel.
  • All DALI functions are programmed with either DIGIDIM Toolbox or Designer software.
  • DIN-rail mounted and only 88 mm wide.



 Installation Notes

  • The blinds controller is for use with motors up to 550 W.
  • The external mains supply to the unit must be protected. It is recommended that a 6 A MCB is used.
  • All cabling must be 230 V mains rated.



Technical Data

Relay load

Motor load:

550 W max.



Standard DIGIDIM removable terminal block 0.5 mm² – 1.5 mm² solid or stranded


Up to 4 mm² solid core or up to 2.5 mm² strandedNote: If equipment is used in an electrically noisy environment, the DALI cable should be screened and connected to the earth.


Mains supply:

220 VAC – 240 VAC, 50 Hz – 60 Hz

DALI consumption:

2 mA

Mechanical data


88 mm × 90 mm × 58 mm


DIN-rail case 88 mm wide


300 g


DIN rail (installation in switchgear/controlgear cabinet)

IP code:

IP30 (IP00 at terminals)

Operating and storage conditions

Ambient temperature:

0 °C to +40 °C

Relative humidity:

Max. 90 %, noncondensing

Storage temperature:

−10 °C to +70 °C

Conformity and standards


EN 55015


EN 61547


EN 61347-2-11


4 kV


Complies with WEEE and RoHS directives.






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