Honeywell HVAC400x Applications Manual page 87

HVAC400X – APPLICATION MANUAL
If the cable that connects the motor and the drive has a motor switch, you can use the Motor Switch function. The
operation of the motor switch makes sure that the motor is isolated from the voltage source and does not start
during the servicing.
To activate the function, set the parameter P3.1.2.2 to the value Enabled. The drive stops automatically when the
motor switch is opened, and the drive starts automatically when the motor switch is closed. The drive does not trip
when you use the Motor switch function.
B
0 1
A
Fig. 9. The motor switch between the drive and the motor
Legend
A. motor switch. B. Mains.
P3.1.2.3 ZERO FREQUENCY VOLTAGE (ID 606)
You can use this parameter to set the zero frequency voltage of the U/f curve. The default value for the parameter
is different for each unit size.
P3.1.2.4 MOTOR PREHEAT FUNCTION (ID 1225)
You can use this parameter to enable or disable the Motor Preheat function. The motor preheat function keeps the
drive and the motor warm during the stop status by giving the motor a DC current.
P3.1.2.5 MOTOR PREHEAT FUNCTION (ID 1226)
You can use this parameter to set the temperature limit of the Motor Preheat function. When the heatsink
temperature or the measured motor temperature goes below this level, motor preheat becomes active.
P3.1.2.6 MOTOR PREHEAT CURRENT (ID 1227)
You can use this parameter to set the DC current of the Motor Preheat function.
P3.1.2.7 U/F RATIO SELECTION (ID 108)
You can use this parameter to set the type of the U/f curve between zero frequency and the field weakening point.
87 EN2B-0417GE51 R0719