CHAPTER 2: PRODUCT DESCRIPTION SPECIFICATIONS
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 2-51
2
LED INDICATORS
Functions: 5 device status indicators
9 event cause indicators
8 user-programmable pushbutton indicators
PUSHBUTTONS
Type: membrane
Functions: 5 bottom Tab pushbuttons and 1 Home pushbutton for page recall
4 directional, 1 ENTER, and 1 ESCAPE pushbutton element selection
10 side pushbuttons for power system element control
RESET pushbutton
8 physical user-programmable pushbuttons, 8 graphical interface pushbuttons
INGRESS PROTECTION
IP code: IP20 front, IP54 front with graphical front panel, IP10 back
2.6.12 Environmental
AMBIENT TEMPERATURES
Storage temperature: –40 to 85°C
Operating temperature: –40 to 60°C; the LCD contrast can be impaired at temperatures less than –20°C
HUMIDITY
Humidity: operating up to 95% (non-condensing) at 55°C (as per IEC60068-2-30 variant 1, 6 days)
OTHER
Altitude: 2000 m (maximum)
Pollution degree: II
Overvoltage category: II
Ingress protection: IP20 front, IP10 back
Noise: 0 dB
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