ABB LGR-ICOS GLA531 Series - Power Supply and Converters

Operating Manual
3KXG165002R4201_2021_04 ABB PROPRIETARY INFORMATION 56
GLA531 Series LGR-ICOS™ Gas Analyzer
AC-to-DC 24 V Power Supply Converter
The AC/DC power supply converter (see Figure 44) provides 24 V DC power to the analyzer. The AC power feed
to this power supply comes directly from a power-entry module with a 5 A fuse (located at the upper right corner
of the enclosure). When the instrument is operating properly, the DC OK green LED illuminates.
Figure 44 AC/DC Power Supply Converter
DC/DC Voltage Converter
The DC-to-DC voltage converter takes the main 24 V DC from the AC/DC power supply and converts it into
multiple rails of DC outputs. Each DC voltage output wire is color coded as listed in Table 14 below.
Table 14 Wire Color to DC Voltage Association
Wire Color DC Voltage
Black Common
Red +5 volts
Green +12 volts
Purple +12 volts
Blue +15 or +24 volts
White –12 volts
Orange –15 or –24 volts