Rittal PMC12 User Manual

UPS Working Principle
UPS-Manual
22
EN
5. UPS Working Principle
5.1. UPS System Block Diagram
Fig 5.1
Figure 5.1 above illustrates the True On-Line
Double Conversion architecture of the UPS
system. The major modules consist of:
1. An AC to DC power converter (Rectifier) with
PFC control circuit
2. A DC to AC power high frequency inverter
3. An Intelligent Battery Charger
4. A bank of stationary maintenance-free
batteries
5. A DC to DC push/pull converter control
circuit
6. A Static Bypass Loop
7. Input & Output EMI Filter
The table below provide a summery guide to
the UPS operating modes against the Utility AC
Power Source conditions.
Utility
Conditions
UPS Operating
Modes
LEDs
Display
indications
Mains Available
Rectifier convert AC to
DC, battery charging,
Inverter convert DC to
AC and supply to loads
with clean & stable
power.
, ,
LEDs remain
illuminated
Mains Absent
(under or over
voltage)
Rectifier and charger
stop operating, Battery
discharge via DC~DC
boost circuit and supply
to Inverter. Loads
continue to receive
supply from Inverter.
Alarm buzzer beeps,
UPS now on battery
mode.
LED (Nr. 2)
off,
Mains Absent,
Battery low
voltage
Rectifier and charger
stop operating, Battery
discharge via DC~DC
boost circuit and supply
to Inverter. Alarm
buzzer beeps with quick
& short succession,
indicating battery power
low and Inverter may
stop supply soon.
LED off,
LED illuminated.
In LCD lights up
.
Paragraph 5.2 ~ 5.7 below provide detailed de-
scriptions of the UPS operating principle.
5.2. When Mains is Available
When Mains is available, the AC source is rec-
tified to DC, partially fed into the charger to
charge battery and partially fed into inverter.
The inverter revert the DC to a cleaned and
pure AC to supply energy to the load con-
nected. The , , LED’s illuminated.

Rittal PMC12 Specifications

General

Brand	Rittal
Model	PMC12
Category	UPS
Language	English