Installation
Copyright © 2019 Eaton Corporation. All Rights Reserved.
IPN March 2019
57
AC supply
Primary transient protection devices
High voltage protection unit with alarm output
Secondary transient protection devices (MOVs)
DC power system
EFX48 GPIO inputs
EFX48 e-Fuse unit
Rectifiers
Step 2 - Check the type of ac supply
Check the type of ac supply. Only the types of ac supply listed in the Specifications on
page 138 are suitable for the RM3-340/440.
Only use an ac supply referenced to ground, or with a protection system so that
the phase-ground voltage cannot exceed the rating of the rectifier.
Step 3 - Disconnect device and overcurrent protection
1 The socket outlet(s) shall be installed near to the RM3-340/440 and shall be
readily accessible.
2 Each socket shall be protected by an overcurrent protection device (a circuit
breaker suitable for Branch Circuits and rated 15A or less).
3 The external circuit breaker(s) must be two-pole type wired in each conductor, if:
• the ac supply is 2W (see Specifications on page 138), or
• the ac supply is 1W+N but the neutral is not clearly identified.
Step 4 - Check ac discrimination
Each rectifier has two internal fast-acting fuses. Under certain internal fault conditions
these fuses will blow.
If there is insufficient discrimination between these fuses and an upstream ac
supply-disconnect device supplying the RM3-340/440 then the ac supply to all
rectifiers will be disconnected if a rectifier fuse blows.
1 Check the time-current (tripping) curve(s) of all ac supply-disconnect device(s)
upstream of the RM3-340/440 with the following curve for the rectifier fuses.
Refer to the manufacturer's data for tripping curves.
2 No action is required if the time-current curves of the upstream ac supply-
disconnect devices are entirely to the right of the curves for the rectifier fuses.
3 If the curve of an upstream ac supply-disconnect device crosses the curve for the
rectifier fuse there may not be adequate discrimination. Contact your Eaton dc
product supplier for advice (see Worldwide Support on page 161).
There is a maximum rating for the first upstream circuit breaker(s). See Step
3.
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