19 3 Operation
Alpha Technologies
3.4 Setting the Parameters (Continued)
Notes:
1) HE Mode Set: This is used to set if the unit sends the line power through double conversion
and then to the loads (HE Mode:OFF) or straight through to the loads (HE Mode:ON).
2) Set Generator Mode: This widens the input parameters so the unit can be used with a
generator.
3) Site Wiring Alarm: This tells you if the line’s ground and neutral wiring is reversed.
4) Free Run Mode, Bypass Enable/Disable at Free Run Mode: These two parameters work
together to control the unit’s input voltage or frequency windows.
The available combinations are:
Combination Result
Free Run: ON
Bypass: DISABLED
(Factory Default)
Input window is:
45-65 Hz (Automatic frequency sensing)
96-138 VAC (60 Hz)
184-265 VAC (50 Hz)
Free Run: ON
Bypass: ENABLED
Input voltage window is:
±10%, +10%/-15% or +15/-20% VAC
(operator set)
Free Run: OFF
(Bypass is automatically
turned off)
Input frequency window is:
±2%, ±5% or ±7% Hz
(operator set)
Figure 3.2
Free Run/Bypass Combination Table
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