Annex B Safety Knowledge
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will be a risk. For example, if the motor cannot start normally which leads to stall will cause
too large input current, causing a fire etc. To avoid accidents, and ensure safety of the
environment and the instrument, ST is required.
2 ST conditions
Under normal operating voltage, the motor should be able to start. Check if it is qualified
via the following tests.
a. Under 32℃ or 43℃ based on the climate, close the door or cover of the instrument, and
start it 3 times under 0.85 times of rated voltage.
b. After start of the instrument, keep sufficient time for turning on to ensure that the motor is
properly started, and there is sufficient lubrication.
c. Keep sufficient interval between two successive starts, to avoid extreme overheating of the
motor and abnormal pressure increase of liquid chiller, and keep balanced pressure
between the high pressure side and the low pressure side.
d. It is allowed to start after the motor - compressor start relay acts for 3 times.
e. The voltage drop of power supply shall not exceed 1% during the test.
f. During the test, no overload protection device should act.
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