CHAPTER 1: BEFORE YOU START
D20MX INSTRUCTION MANUAL GE INFORMATION 25
Field-replaceable fuses for the standard chassis-mounted Power Supplies are listed in
Table 7. These are the standard factory-installed fuses, unless otherwise specified. Always
replace with the same type and values of fuse.
Table 7: Field-replaceable fuses
Modems
D20 modems (can be purchased separately) for communications to a host computer or to
other IEDs.
For example, WESDAC 202/V.23 is a 1200-baud Bell 202 or CCITT V.23 standard modem
designed for 300 to 1200 baud asynchronous operation on unconditioned lines and
supports the majority of SCADA/EMS applications. It is available in a 3U (GE part number
520-0120) vertical mount configuration in the D20 chassis; the 19 inch rack mount (GE part
number 520-0090) version is currently not supported.
Third-party modems can be used to meet specific requirements. These modems are
connected to the D20 via standard RS-232 connections. Contact GE Digital Energy for
more information on options.
Power Supply Fuse Fuse Function Replacement Fuse
(¼inch by 1 ¼ inch Time Delay)
580 - 2004 F1 +DC Input 12 A / 250 V
F2 -DC Input 12 A / 250 V
580 - 2005 F1 +DC Input 12 A / 250 V
F2 -DC Input 12 A / 250 V
580 - 2006 F1 Line/+DC Input 4 A / 250 V
F2 Neutral/-DC Input 4 A / 250 V
580 - 2007 F1 Line/+DC Input 4 A / 250 V
F2 Neutral/-DC Input 4 A / 250 V
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