TECHNICAL MANUAL "SE" (PBM753) Revision no. 1 dd. 01/02/2017
P.B.M. S.r.l. via Barella, Z.I. - VIGNOLA ( MO ) ITALIA Tel. + 39 (059) 7705311 Fax + 39 (059) 7705300
http://www.gruppopbm.ite-mail : pbm@gruppopbm.it file: Manuale SE PBM753 GB rev.1.doc
page 16
• If strong vibrations are heard during the charging process and the charging process is not performed
regularly because the cut-out-switch or the fuses operate, it means that the bridge is in short-circuit and
it needs replacing.
• On the other hand it is easy to diagnose the open bridge failure on a three-phase charger by operating
the charger without connecting the battery and forcing the power supply of the transformer. If an
anomalous transformer voltage, instead of a no-load voltage, is detected under these conditions, it means
that the rectifier bridge is at least partially open and needs replacing.
• As for single-phase and three-phase battery chargers, the no-load output voltage corresponds to the
values contained in the following table (provided that transformer is correctly powered).
RATED BATTERY
VOLTAGE
NO-LOAD OUTPUT VOLTAGE (DC)
FOR A SINGLE-PHASE BATTERY
CHARGER
NO-LOAD OUTPUT VOLTAGE (DC)
FOR A THREE-PHASE BATTERY
CHARGER
12V 14 ÷ 15V 18 ÷ 24V
24V 28 ÷ 30V 33 ÷ 38V
36V 42 ÷ 44V 50 ÷ 58V
40V 46 ÷ 48V 60 ÷ 70V
48V 56 ÷ 58V 72 ÷ 80V
72V 85 ÷ 87V 100 ÷ 108V
80V 95 ÷ 98V 110 ÷ 120V
96V 112 ÷ 115V 130 ÷ 150V
CHAPTER 11 : MAINTENANCE AND CLEANING
All maintenance and cleaning processes have to be performed by qualified, skilled, and authorised
personnel.
• Since the battery charger is an electrical equipment without any moving mechanical part, it does not need
any special maintenance.
• It is however suggested to check, inspect, and clean the charger at least once a year if it operates in a
fairly “clean” environment.
• In “hard” conditions, that is in dusty and wet environments, checks have to be performed more frequently.
The main checks to be performed are the following:
− Place the charger/s outdoor and remove the closing panel.
− Wear a faceplate and protection devices. Using compressed air, remove dust accumulated inside the
charger.
− Use non-corrosive detergents to remove sludge deposits or other dirt.
Once the charger has been cleaned, perform the following actions:
− Check the general condition of components and their integrity.
− Replace oxidized cables and/or terminals, if any.
− Use proper sprays to clean electrical contacts on contactors, switches, and commutators.
− Check the tightening of screws and bolts, replace the rusted items, if any.
− Perform a “dry cleaning” or use proper sprays to clean electronic cards.
− Check the status of both control and power connectors. Check the “wear” of power connectors and
replace them, if necessary.
− Check the condition of electrical plugs.
− Once all the above-mentioned operations have been performed, close panels, doors and covers again,
and place the charger/s in its/their position/s again.
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