Restore System Power After An Epo Shutdown; Battery Backup Time And Discharge Process - Toshiba 5000 Series Installation And Operation Manual

13.5

Restore System Power after an EPO Shutdown

After shutting down the UPS by pressing the EPO switch, restore system power as follows:
1. Ensure the cause of the EPO action has been resolved.
2. Reset the UPS Input Breaker (MCCB-1) and Bypass Input Breaker (MCCB-2), located within the MBS Bay, by
first switching the breaker OFF, then ON.
3. Follow the startup procedure as given in Section 13.2.
4. Reset the Battery System (if any) circuit breaker(s) by first switching the breaker OFF, then ON.
13.6

Battery Backup Time and Discharge Process

The optional battery system provides some period of back-up time depending on the UPS kVA rating, battery size, and
system load. The exact length of these times will depend on the UPS model used, condition of the batteries, amount and
type of load, temperature and other variables.
Figure 13.1 graphically illustrates the battery discharge process under full load conditions.
The UPS battery voltage to drops as the battery discharges. The chart in Figure 13.1 lists the voltage level at which each
UPS low-voltage alarm will sound and at what level the low-voltage condition will cause the unit to automatically shut down.
66
Nominal voltage (V
Alarm voltage (V
Shutdown voltage (V
CURRENT VOLTAGE
V
NOM
V
LOW
V
MIN
I
MAX
I
MIN
100%
FIGURE 13.1: TYPICAL BATTERY DISCHARGE CURVE
5000 Series 3P1 Industrial UPS Installation and Operation Manual – 92973-001
)
nom
)
low
)
min
20%
Battery Capacity
120 Vdc
111 Vdc
105 Vdc
Shutdown
Voltage
TIME
0%