Device and channel operating Temperature and Derating
During operation with rated load on all channels (total 8 amps), and with the unit installed in an environment maintained at the rated operating temperature, the internal components are maintained at temperatures which helps in long-term reliability.
As a result, there is a trade-off between the dimmer units total rated load and rated operating temperature. The rated load of 8 amps is at 100% with the temperature of the operating environment equal or below 35° C, and is reduced linearly according to the table to a maximum operating temperature of 55° C where the total dimmer load of 4 amps, 50% is sustained.
In order to maintain the operating environment within the rated operating temperature range, the operating calorific values and the heat load must be considered when designing the distribution board.
To maximize life span, dimmers incorporate several protection features, for early diagnosis of adverse environmental factors.
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If the load on the dimmer is too high for the environmental and loading conditions, and the dimmer channel temperature rises above 80° C, the dimmer channels will reduce their brightness to lower the operating temperature, which will be indicated as an "Over Temperature Windback" condition.
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In the "over temperature windback" condition, if the dimmer channel temperature continues to rise and reaches to 100° C, the dimmer channels will shut down to protect the unit.
Once the shutdown condition is triggered, the channel has to be turned off and on again from C-Bus.
Operational environment conditions and status information can be relayed to integrators via the SpaceLogic C-Bus Commission software and via the C-Bus Error Reporting and Measurement Applications (if enabled).
Heat Load Generated by the Dimmer
To secure adequate operation temperature, while designing the distribution boards, refer below table for calorific values generated by the dimmer during operation.
|
Dimmer |
Load Capacity |
C-Bus Power Supply Status |
Heat |
|
|
5508D1D ( 8 channel 1 A) |
At Maximum Load |
C-Bus Power Supply Enabled |
74.4 |
BTU/h |
|
C-Bus Power Supply Disabled |
65.9 |
|||
|
At Minimum Load |
C-Bus Power Supply Enabled |
19.8 |
||
|
C-Bus Power Supply Disabled |
11.3 |
|||
|
5504D2D ( 4 channel 2 A) |
At Maximum Load |
C-Bus Power Supply Enabled |
74.4 |
|
|
C-Bus Power Supply Disabled |
65.8 |
|||
|
At Minimum Load |
C-Bus Power Supply Enabled |
16.4 |
||
|
C-Bus Power Supply Disabled |
7.8 |
|||