Option Switch Settings, Battery Test Button

OPTION SWITCH SETTINGS

On the back of your UPS is a bank of option switches (6) with a removable plastic cover. These switches determine transfer levels and operating frequency. Slide the switches to the left to turn them OFF, to the right to turn ON. Turn OFF equipment and UPS and unplug the UPS prior to changing switch settings, or the UPS will ignore the new settings. Replace the plastic option switch cover.

Option Switch 1: 50/60 Hz Select – When OFF, this switch sets UPS for 60 Hz utility. Output in backup mode will be 60 Hz. When ON, the switch sets UPS for 50 Hz utility and output in backup mode is 50 Hz. The switch must match the utility frequency or the UPS will not start. The factory setting is 60 Hz.

Option Switch 2: High Line Transfer –

250VA model: When ON, this switch transfers the UPS to battery operation when the utility voltage reaches 135 VAC. When OFF, the UPS will not transfer to battery. Factory setting is ON.

400/600VA models: You may select at which voltage the UPS will transfer to battery operation when it encounters a high utility voltage. The ON position transfers the UPS to battery operation at 135VAC; the OFF position transfers at 140VAC. Factory setting is 135 VAC.

Option Switch 3 & 4: Low Voltage Transfer Select – Low voltage transfer is the voltage level at which battery operation starts. You may set the low voltage transfer of the UPS to 90V, 95V, or 100V. The factory setting is 95V. This option reduces excessive battery usage in brownout conditions. Make sure your computer equipment can operate at 90 VAC before selecting the lowest limit (most will). Refer to the tables below to change switch settings:

250 VA MODEL

VOLTAGE	SWITCH #3	SWITCH #4
100V	ON	N/A
95V	OFF	OFF
90V	OFF	ON

400/600 VA MODELS

VOLTAGE	SWITCH #3	SWITCH #4
100V	OFF	N/A
95V	ON	OFF
90V	ON	ON

Option Switch 5: Line Neutral Reverse Alarm – When ON, this switch enables the L-N reverse alarm, which detects wiring faults. When OFF, the alarm is disabled. The factory setting is ON.

BATTERY TEST BUTTON

The Battery Test Button (5) on the 400 and 600 VA models tests the condition of the battery. If the charge is sufficient, the UPS lights the Battery Light (2), runs on battery power for 15 seconds, then returns to utility power. If the battery fails the test, the Check Light (3) illuminates and the UPS immediately returns to utility power. The Check Light remains lit while on utility power. A battery in unacceptable condition requires recharge or replacement of the battery.

Pressing the Battery Test Button (5) also silences alarms.

PS400-60S, PS250-60S, PS600-60S specifications

The Liebert PS600-60S, PS250-60S, and PS400-60S are advanced power supply units designed to provide reliable power protection for critical equipment. These systems are vital for industries that require an uninterrupted power supply, such as data centers, telecommunications, and healthcare.

One of the standout features of the Liebert PS series is its robust design and high efficiency. The PS600-60S, with its 600VA capacity, offers a compact solution for smaller environments while still delivering reliable performance. The PS250-60S, with a 250VA capacity, caters to applications with less demanding power requirements, making it ideal for point-of-sale systems or telecommunications equipment. The PS400-60S, on the other hand, balances size and power, providing 400VA to meet moderate power needs effectively.

All models in the Liebert PS series leverage advanced technologies to ensure top-tier performance. They are equipped with sine wave output, which is crucial for sensitive electronic devices as it minimizes electrical noise and enhances performance. Additionally, the units feature automatic voltage regulation (AVR) that stabilizes output voltage, protecting equipment from surges and dips in power.

Another significant characteristic of the Liebert PS600-60S, PS250-60S, and PS400-60S is their user-friendly interface. Each model includes LED indicators that provide real-time information regarding the operational status, battery health, and load level. This feature allows users to monitor the unit easily, ensuring they can respond promptly to any potential issues.

Battery management is also a key feature in these models. They are equipped with intelligent charging technology that prolongs battery life and optimizes performance. The hot-swappable batteries allow for maintenance without disrupting the power supply, which is essential in critical environments.

In conclusion, the Liebert PS600-60S, PS250-60S, and PS400-60S power supply units are designed to offer reliable, efficient, and user-friendly solutions for power protection. Their combination of compact design, advanced technologies, and essential features makes them ideal for a vast array of applications, ensuring a stable power supply for sensitive equipment while enhancing overall operational efficiency.