Operation With Back-Up Batteries - Santerno DCREG2 Series User Manual

DCREG2
DCREG4
6.10.9 O
PERATION
D1: Freewheeling diode for electromagnet
D2: Diode disabling battery charge from DCREG4
D3: Battery protecting diode
EM: Electromagnet
F1-2: Fuses for battery charger
K1: Contact NO of freewheeling contactor
K2: Contact NC of battery plug-in contactor
L: Line inductance for battery charger
TR: Isolation transformer for battery charger supply
(this is required if DCREG4 is not isolated
from the mains)
DCREG4
For safety reasons, coil in contactor K2 voltage is derived from the mains, with normally closed power
poles.
When supply mains is on, poles are open.
When voltage is removed, poles of contactors K1 and K2 must instantly close. Battery supply is then
delivered to the electromagnet.
When the converter comes on again, external contacts and the DCREG4 reference must be capable of
starting it up immediately (electromagnet energizing with a properly large voltage reference). If no alarm
trips, an external timer must be enabled. When its counting is over and the DCREG4 is adjusting a
voltage value higher than the voltage supplied to the batteries (see section below), freewheeling diode and
reserve batteries may be disconnected. Poles of contactors K1 and K2 open again.
If voltage is removed while deenergizing (i.e. after pressing button PD), batteries shall not activate,
because if counter-energizing has already started, DCREG4 output should be short-circuited from diode
D1.
Diodes D1...3 are to be dimensioned for a current value equal to the electromagnet
NOTE 1.
current and for inverse voltage equal to 1600V, provided that DCREG4 3-phase supply
does not exceed 440V.
NOTE 2. Current used to charge safe batteries can be equal to 10% of their capacity in Ah, for a
time period of approx. 10h.
W B -
ITH ACK
( )
K1
D1
( )
OPERATION SEQUENCE
B
UP ATTERIES
BATTERY CHARGER
L
K2
D3
EM
D2
15P0059B3
USER MANUAL
TR
F1
F2
BATTERIES
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