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MITSUBISHI ELECTRIC 2033C SERIES UPS
MITSUBISHI
ELECTRIC
2033C SERIES UPS
OWNERS / TECHNICAL MANUAL
Page Number:
1-6
FIGURE 1.2 Single Line Diagram - Bypass Operation. Load fed through static bypass line.
Referring to Figure 1.2, the Internal Static Bypass line is a Hard wired line through CB3 which
supplies the critical load with unconditioned input power. The purpose of this line is to route power
to the critical load while the UPS module is de-energized (converter and inverter), and during
Start-up before the system is fully operational.
The internal control system determines the operation of the two paths, with the load powered from
the inverter being the normal operation.
Referring to Figure 1.3, if the input power is interrupted, the battery will immediately supply the DC
power required by the Inverter to maintain continuous AC power to the load. A fully charged battery
will provide power for the specified time at the rated load, or longer at reduced load.
When power is restored after a low battery shutdown, the Converter automatically restarts operation,
recharges the batteries and the Inverter is automatically restarted without operator intervention. The
load is assumed by the inverter automatically without operator intervention.
In the event of a power failure, the Converter will de-energize and the batteries will discharge into
the Inverter and maintain power to the critical load until a) the battery capacity expires and the
inverter turns off, or b) input power is restored after which the converter will power the inverter and
simultaneously recharge the batteries. Figure 1.3 illustrates the flow diagram during battery
operation.
Maintenance
Bypass
Switch
FB
BATTERY
CB2
CB3
Static Transfer
Switch
Power Flow
Not in Use
Output
52C
CB1
FI
FO
AC input
CB
User
su
pp
lied
CONVERTER
INVERTER
UPS Module
40kVA, 50kVA:
External Battery
52CS(7.5-20kVA)
52MB&52L(30-50kVA)