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Motor Loads
Induction motors (motors without brushes) require two to six times their
running current on start up. The most demanding are those that start under
load (e.g. compressors and pumps). Of the capacitor start motors (typical
in drill presses, band saws, etc.), the largest you can expect to run is 1/2 to
1 hp (the transfer relays are rated at 2 hp.) Universal motors are generally
easier to start. Since motor characteristics vary, only testing will
determine whether a specific load can be started and how long it can be
run.
If a motor fails to start within a few seconds or loses power after running
for a time, it should be turned off. When the inverter attempts to start a
load that is greater than it can handle, it will turn itself off after a few
seconds.
Long Transfer Times
Xantrex has observed a specific situation where the Freedom HF may
take a long time to transfer to inverter mode when shore power fails -
maybe 0.1-0.2 seconds. This can occur when the Freedom HF is power
motor loads where the motor is able to freewheel when power is removed
(e.g. a grinder). This long transfer may cause computers or other sensitive
equipment to operate incorrectly. If power glitches must be minimized
then Xantrex recommends that motor loads not be operated when
sensitive equipment is being used.
Freedom HF Owners Guide.book Page 11 Friday, December 21, 2007 2:18 PM