Powerware 9335 User Manual download pdf (Page 58)

7-10 Powerware 9335 (80 kVA and 120 kVA) Installation and Operation

164201396 REV A 071103

7.4 O perating Modes

7.4.1 “ON LINE” Mode (INVERTER MODE)

The ON-LINE Mode is the UPS Operating Mode in which the load is supplied through

the RECTIFIER and INVERTER. LED indicators are illuminated when shown shaded:

LED’s green

when shown

shaded

Using the control panel (see Figure 7–2) the UPS can easily be transferred to the ON-

LINE mode. The ON-LINE mode provides the highest degree of protection, especially in

the event of a supply disturbance or failure. This operating mode is always

recommended if the critical loads (computer systems) will not tolerate any interruption of

the supply, even for a very short time. In the unlikely event of an inverter fault or

overload condition, the UPS will transfer the load automatically and without interruption

to the static bypass-utility supply.

7.4.2 “OFF LINE” Mode (BYPASS or ECONOMY MODE)

In the OFF-LINE mode, the load is supplied from the utility supply through the bypass.

Using the control panel (see Figure 7–2), the UPS may be easily transferred to “Bypass

Mode”.

LED’s green

when shown

shaded

When the UPS is operating in “Bypass Mode”, the efficiency of the system is higher. In

the event of a utility supply failure the load will automatically be transferred from utility to

LINE 2 BYPASS

BATTERY

LINE 1 INV.

LINE 2 BYPASS

BATTERY

LINE 1 INV.

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Powerware 9335 User Manual Page 58