Baldor 23H Series, Инструкция по установке и эксплуатации, Страница: 64 / 127

Level 2 Programming Blocks
Output Limits Block
Operating Zone - This parameter sets up the Operating Zone of the control for Standard PWM
output bridge carrier frequency (2.5KHz) or Quiet PWM output bridge carrier frequency (8.0KHz) in a
Constant Torque mode which has a 200% 3 second with a 150% 60 second peak overload capacity
or a Variable Torque mode which has a 115% peak overload capacity for 60 seconds. Selection of
an Operating Zone automatically sets the PWM frequency, motor rated amps and peak current limits
to the values listed on the control's nameplate output rating for the zone selected. Note, the
control's power rating can change depending on which zone is selected.
Standard PWM zones should be selected for applications requiting maximum power output from the
control. Quiet PWM operating zones should be selected if quiet motor operation is desired.
Constant Torque zones should be selected if the application requires overload current of more than
115% of the control's rating. Variable Torque zones should be selected if the application requires
minimal overload current of 115% or less of the control continuous rating.
The available Operating Mode selections are STD CONST TQ, STD VAR TQ, QUIET CONST TQ,
QUIET VAR TQ. The factory preset is QUIET CONST TQ.
Min Output Speed - Sets the desired minimum motor speed in RPM. The available range is
0-maximum speed. The scaling of an external speed command signal will also be affected to the
extent that a minimum speed command will represent will represent the minimum output speed.
During operation, the output speed will not be allowed to go below the minimum output speed
unless the motor is starting from 0 RPM or is ramped (dynamically braked) to a stop. The factory
preset is 0 RPM.
Max Output Speed - Sets the desired maximum motor speed in RPM. The scaling of an external
speed command signal will also be affected to the extent that a maximum speed command will
represent the maximum output speed. The available range is 0-32767 RPM. The factory preset is
Rated Motor Speed.
Pk Current Limit - Sets the maximum output current in amps that will be provided to the motor.
The adjustable range is peak rated current. Values above 100% of the rated continuous current are
available depending upon selected operating Zone. The factory preset is the Constant Torque
Operating Zone peak current rating for the control.
PWM Frequency - Sets the switching rate of the output (inverter) section power transistors. The
PWM frequency can be increased to minimize audible noise that may be present at the motor. In
general, the PWM frequency should be set as low as possible to minimize the stress on the output
transistors and motor windings. PWM frequency is also called "carrier frequency". This parameter is
set initially when the Operating Zone is programmed. This setting can be changed to the limits of
the operating zone which are: 1-5KHz in the Std Const Tq and Std Var Tq zones and; 1-16KHz in
the Quiet Const Tq and Quiet Var Tq operating zones. The factory preset is 8.0KHz which is the
nominal value for the Quiet Const Tq operating zone.
3-11 KEYPAD PROGRAMMING AND OPERATION
MN723H-10/95 11/28/95 1:11 AM Page 65 (Black plate)