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CHAPTER 1: BEFORE YOU START

Modems

D20MX HARDWARE USER'S MANUAL
Figure 5: D20 - Location of field-replaceable fuses
Field-replaceable fuses for the standard chassis-mounted Power Supplies are listed in
Table 6. These are the standard factory-installed fuses, unless otherwise specified. Always
replace with the same type and values of fuse.
Table 6: Field-replaceable fuses
Power Supply
Fuse
580 - 2004
F1
F2
580 - 2005
F1
F2
580 - 2006
F1
F2
580 - 2007
F1
F2
Two D20 modems (can be purchased separately) for communications to a host computer
or to other IEDs:
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 19 inch rack mount or 3U
vertical mount configuration in the D20 chassis.
WESDAC 212/V.23 is a 1200-baud Bell 212 standard modem, (auto answer only), used
for dial-up access to the D20. This modem is available for mounting only as a 3U
vertical mount.
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.
GENERAL
Field-replaceable
fuses
Fuse Function
Replacement Fuse
(¼inch by 1 ¼ inch Time Delay)
+DC Input
12 A / 250 V
-DC Input
12 A / 250 V
+DC Input
12 A / 250 V
-DC Input
12 A / 250 V
Line/+DC Input
4 A / 250 V
Neutral/-DC Input
4 A / 250 V
Line/+DC Input
4 A / 250 V
Neutral/-DC Input
4 A / 250 V
21

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