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Description
498 8 × 16 A Relay Unit
8-Channel Relay Unit (498)
The DIGIDIM 498 8-Channel Relay Unit is fitted with high-inrush specification relays, rated at 16 A per channel, which handle short-lived, high-peak inrush currents during switch-on of loads.
It can be networked through either DALI or SDIM communication to be incorporated into a DIGIDIM or Imagine lighting control system.
The unit has an intuitive LED segment display and push buttons for monitoring, manual configuration and control purposes.
Key Features
- High-inrush specification relays (single pole, normally open).
- Wired override input to allow for external triggers.
- LED segment display and push buttons.
- Can operate as: 8 individual channels (8 × 1)
- 4 sets of 2 channels (4 × 2)
- 2 sets of 4 channels (2 × 4)
Technical Data
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Connections |
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Mains/relay: |
Up to 4 mm² solid or up to 2.5 mm² stranded |
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DALI: |
0.5 mm² – 1.5 mm² solid or stranded. Max. length: 300 m @ 1.5 mm². |
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SDIM/DMX: |
0.22 mm² – 1.5 mm² low-loss RS485 type (multistranded, twisted and shielded). Max. length: 1000 m (low-loss cable). Examples: Belden 8102 or Alpha 6222C. Note: One twisted pair for A and B (85 Ω to 100 Ω impedance), one core or twisted pair for 0 V, and shield for screen. |
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Cable rating: |
Mains cables, relay cables and DALI cables must be mains rated. |
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Power |
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Mains supply: |
100 VAC – 240 VAC (nominal) 85 VAC – 264 VAC (absolute) 45 Hz – 65 Hz |
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Power consumption: |
2.6 W |
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Standby power consumption: |
1.1 W |
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Internal losses: |
2.1 W + max. 1.6 W per channel |
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External protection: |
The mains supply must be protected at 6 A maximum. The relays must be protected by a 16 A Type C MCB maximum. |
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DALI consumption: |
2 mA |
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Compliance: |
Complies with DSI standard v 2.0. |
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Isolation: |
Between every connector, with this exception: ‘SDIM 0 V’ and ‘OVR 0 V’ are not isolated from each other. |
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Inputs |
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Communication: |
DALI, SDIM and DMX |
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Override: |
Wired override input |
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User interface: |
2 push buttons for configuration |
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Channels: |
8 (2 channels per four-way connector) |
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Relay contacts: |
High inrush (800 A at 200 μs), single-pole, single-throw (SPST) relay. W premake contact + AgSnO₂. Optimised for high currents. |
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Relay voltage: |
240 VAC (400 VAC between channels) |
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Max. load per contact: |
16 A resistive/incandescent 10 A HID (cos y = 0.6) |
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Number of devices: |
For ballasts, quantity is limited by MCB; refer to manufacturer’s data. These are power relays and therefore not suitable for extra-low voltage operation. Where power relays are used to control contactors, make sure that snubbers are fitted |
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Mechanical data |
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Dimensions: |
160 mm × 90 mm × 58 mm |
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Housing: |
Plastic (polycarbonate) DIN-rail case |
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Weight: |
400 g |
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Mounting: |
DIN rail (installation in switchgear/ controlgear cabinet) |
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IP code: |
IP30 (IP00 at terminals) |
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Operating and storage conditions |
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Ambient temperature: |
0 °C to +40 °C |
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Relative humidity: |
Max. 90 %, noncondensing |
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Storage temperature: |
–10 °C to +70 °C |
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Conformity and standards |
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EMC emission: |
EN 55015 |
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EMC immunity: |
EN 61547 |
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Safety: |
EN 61347-2-11 |
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DALI: |
DALI standard IEC 60929, with Helvar additions |
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SDIM: |
Helvar SDIM protocol |
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DMX: |
DMX512-A protocol (max. refresh rate: 33 Hz) |
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Environment: |
Complies with WEEE and RoHS directives. |