32 Rockwell Automation Publication 750-QS100B-EN-P - August 2020
Step 5: Enter Motor Data
Enter Motor Hot Start Coefficient
This parameter is available in firmware revision 10 and higher. The Motor Hot Start Coefficient parameter allows you to
set the hot state overload curve to some percent of the cold curve representing the motor protection class. This
accommodates requirements for both cold start and hot start. Running from a cold state, the cold curve is used. The
motor is considered to be in a hot state if it has been running above the rated current for at least 20 minutes. Once the
motor is considered to be in a hot state, the hot curve is used for any overload condition. The parameter can have a value
in the range of 0.1…1. A value of 1 makes the hot state overload curve equivalent to the cold curve. A value of 0.1 makes
the hot state overload curve equivalent to 10% of the cold curve.
The default value for Motor Hot Start Coefficient is 0.33. To set Motor Hot Start Coefficient, use the following
procedure.
1. Navigate to parameter 10:210 [Mtr HotStrtCoeff ]. Press the EDIT soft key.
2. Enter the Motor Hot Start Coefficient that is recorded in Tab l e 1 on pag e 8
. Press the ENTER soft key.
Enter Motor Cooling Time
This parameter is available in firmware revision 10 and higher. The Motor Cooling Time parameter allows you to set the
decay time for the motor to go from a hot state to a cool state. The parameter value is the time in minutes. The motor is
considered to be in a hot state if it has been running above the rated current for at least 20 minutes. A hot state occurs
when a motor overload condition appears and the overload count reaches 100%. If the motor was just in a hot state, and
is no longer running above the rated Amps, the motor cooling time begins. This could be because the motor was tripped
off due to an overload, was turned off by a user, or it could still be running, but below the rated Amps. Once the full
length of the motor cooling time has passed, the motor overload count reaches 0%, and the motor is considered to be in a
cool state.
The default value for Motor Cooling Time is 20 minutes. To set Motor Cooling Time, use the following procedure.
1. Navigate to parameter 10:211 [Mtr Cooling Time]. Press the EDIT soft key.
2. Enter the Motor Cooling Time in minutes, that is recorded in Table 1 on pa g e 8
. Press the ENTER soft key.
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