37 - 23/May/97
1.10 Fans
The ventilation is provided by fans mounted under the modules.The size and the number of
fans are according to the system configuration.
Fan input voltage is 230 Vac (or 110 Vac optional). The input power is 60 W for each pair of
fans.
CAUTION: a free circulation must be guaranteed for the air flow.
TAB. 1.15 - FANS.
MODEL
INPUT
VOLTAGE
(V
∼∼
)
PAIR
OF
FANS
CONFIGURATION
DBM F2
230
1
DBM-PS + 1 DBM
DBM F3
230
1
DBM-PS + 2 DBM
DBM F4
230
2
DBM-PS + 3 DBM
DBM F5
230
3
DBM-PS + 4 DBM
DBM F2 (110V)
110
1
DBM-PS + 1 DBM
DBM F3 (110V)
110
1
DBM-PS + 2 DBM
DBM F4 (110V)
110
2
DBM-PS + 3 DBM
DBM F5 (110V)
110
3
DBM-PS + 4 DBM
Note: to size the fans a DBM-L (180 mm) module counts as two DBM modules.
Example: DBM-PS, one DBM module and one DBM-L (180 mm) module, requires a DBM F4
fan type.
1.11 Recovery Circuit
The recovery circuit is formed by a switching regulator, a recovery transistor and a recovery
resistance. While braking the motor returns energy which cannot be sent to the line since the
rectifier circuit is not regenerative. Returned energy tends to increase the BUS BAR DC
voltage. When HV reaches 375V the switching regulator brings the recovery transistor into
conduction, thus connecting the recovery resistance in parallel with filter capacitors. The
recovery resistance is formed by enameled wire fixed resistor(s).
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com