14 | 1.0 Product Description
1.5.3 Battery Mode
The S4K2UC enters Battery Mode when utility power fails or is outside acceptable values. The battery system supplies
power through the DC-DC converter to the inverter to generate clean AC power for the connected loads.
When the S4K2UC enters Battery Mode, the UPS sounds a half-second beep at 10-second intervals.
When approximately 2 minutes of run time remains, the beeps sound every 5 seconds to warn that the battery is getting
low (this low battery warning is user-congurable).
In Battery Mode, the AC Input indicator goes o and the Battery Level indicators illuminate. Each Battery Level indicator
represents a 20% capacity level. As capacity decreases, fewer indicators remain illuminated. Refer to “8.0 Troubleshooting”.
For approximate battery run times, refer to “9.0 Specications—Table 13”. The times in Table 13 are approximate. They are
based on resistive loads and an ambient temperature of 25°C (77°F). To increase this time, turn o non-essential loads
(such as idle computers and monitors) or add optional external battery cabinets.
!
CAUTION
Turning o the S4K2UC while in Battery Mode will result in loss of output power. If the UPS is turned o manually, it
must be manually restarted after utility power returns. If the UPS is turned o by a communication signal or because
the batteries are depleted, it will operate as selected in the conguration program for Auto-Restart (refer to “5.2.1
Conguration Program”).
1.5.4 Battery Recharge Mode
Once utility power is applied to the S4K2UC, the battery charger begins charging the batteries.
1.5.5 Frequency Converter Mode
All models of the S4K2UC are capable of frequency conversion. Frequency Conversion Mode can be selected using the
conguration program. Allowable frequency operating modes include:
• Auto Sensing — 50 Hz or 60 Hz — Bypass Enabled
• Auto Sensing — 50 Hz or 60 Hz — Bypass Disabled
• Frequency Converter — 50 Hz — Bypass Disabled
• Frequency Converter — 60 Hz — Bypass Disabled
NOTE: The default for all models of the S4K2UC is “Auto Sensing — 50 Hz or 60 Hz — Bypass Enabled.”
!
CAUTION
Do not touch the AC input receptacle when the UPS is operating. AC input voltages may still be present, even when
the AC input indicator is o.
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