Product manual EM converterLED ST | 08-2018 | 1.0 | en
Functions in emergency operation
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5.1.2. Calculation
Formel: P = U * I
P
=
U
*
I
Emergency output power:
Given by the EM converterLED ST
type
LED forward voltage:
Detected by the EM converterLED
ST
LED forward current:
Automatically adjusted by the EM
ST
converterLED
Example
Given:
Wanted:
Result:
Different battery cell numbers offer flexibility in the available emergency output power - 2, 3, 4 and 5 cells for LED modules from 10 V
to 250 V forward voltage.
The LED current in emergency mode is automatically adjusted by the
ST based on the total forward voltage of the
EM converterLED
LED modules connected and the associated battery.
Control gear
Forward
voltage
range
SELV
Number of battery cells
EM converterLED ST 103 50V
10-52 V
SELV < 60 V
3 cells for light output in emergency operation
EM converterLED ST 103 NiMH 50V
10-52 V
SELV < 60 V
3 cells for light output in emergency operation
EM converterLED ST 104 50V
10-52 V
SELV < 60 V
4 cells for light output in emergency operation
EM converterLED ST 104
50V
NiMH
10-52 V
SELV < 60 V
4 cells for light output in emergency operation
EM converterLED ST 134 NiCd 50V
10-52 V
SELV < 60 V
4 cells for light output in emergency operation
EM converterLED ST 104 90V
40-97 V
SELV < 120 V
4 cells for light output in emergency operation
EM converterLED ST 104
90V
NiMH
40-97 V
SELV < 120 V
4 cells for light output in emergency operation
LED forward voltage: 45 V (chosen as an example)
_
LED forward current (at 45 V): 60 mA (taken from diagram
ST 103)
EM converterLED
_
Emergency output power?
_
Emergency output power:
P = U * I = 45 V * 60 mA = 2.7 W
_
