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HT33 Series User Manual
Chapter 5 Operating Procedures
This chapter describes UPS operation instructions in detail.
All functional keys and LED display involved in operation instructions please refer to chapter 5.
During operation, the buzzer alarm may occur at any time. Select “mute” on LCD to muffle the audible
alarm.
Warning-Hazardous mains voltage and/or battery voltage present(s) behind the
protective cover
1. The components that can only be accessed by opening the protective cover with tools cannot be
operated by user.
2. Only qualified service personnel are authorized to remove such covers.
5.1 Power Switches
As shown in fig 5-1, open the front door of UPS, the power switch is visible, which includes: input
switch, output switch and maintenance bypass switch (with anti-misoperation stop plate)
a. 10KVA~30KVA (without built-in battery) b. 10KVA~30KVA (with built-in battery)
Fig. 5-1 Mains switch location drawing
5.2 UPS Start-up
The UPS system only has a maintenance bypass isolating switch, and all the other transfers are
processed automatically by internal control logics.
5.2.1 Normal Mode Start
This procedure must be followed when turning on the UPS from a fully powered down condition. The
operating procedures are as follows:
