TECHNICAL MANUAL
942088.001
942088.001 - 24/09/98
7
WIRES SOLDER TO THE POWER START BOARDS
WHITE WHITE
(L)
(M)
GRAY 4
(I)
BLUE 4
(K)
BLACK 4
(NEG BAT)
BLUE BLACK BLACK
(N,C,D)
GRAY BROWN BROWN
(Lin)
GREEN
YELLOW
RED ST1
RED (+BAT)
5.-
ELECTRONIC BOARD OPERATION
5.1 Measurements circuits.
5.1.1
Battery Voltage
: R8 and R9 provide to the microprocessor PD2 pin (analogy input)
an image of the battery voltage.
5.1.2
Output Current
: The UPS will only measure the output current when operating on-
battery. It measures the MOSFET power transistors VDSon. This voltage is
amplified with IC4D and is applied to the PD4 pin.
5.1.3
Mains Measurement
: In the microprocessor PD1 pin there is an image of the input
voltage, this is provided by TR1 transformer, a bridge rectifier (D21, D22, D23 and
D24) and a divider (R15, R43).
TR1 and previous diodes make an interruption to the micro ( IRQ ) when the mains
crosses zero. This signal is filtered through R30 and C17.
With the previous circuit and R13, the micro knows the mains voltage phase.
The diodes D13, D14 and D15 are used as pull-up protection.
5.1.4
Output Voltage
: Through a bridge rectifier (D18, D19, T4 and T5) and a divider
(R29, R48) is performed the measurement of the output voltage in the input PD7.
