Setting Function Description (When Active)
01 FORWARD ONLY
The drive will not respond to a Run Reverse or Start Reverse input, however, Jog Reverse can still cause reverse rotation. Assignment of Jog Reverse to TB13B function should not be made if the driven load can be damaged by reverse operation.
02 FORWARD AND REVERSE
The drive is free to rotate in either direction as called for by the input commands.
19 Acceleration Time
This parameter sets the acceleration rate for all speed reference sources
(keypad, speed pot, 0-10 VDC, 4-20 mA, jog and preset speeds). This setting is the time to accelerate from 0 Hz to BASE frequency (60 Hz or 50 Hz). Set the desired value using the ∆ or ∇ button.
20 Deceleration Time
This parameter sets the deceleration rate for all speed reference sources
(keypad, speed pot, 0-10 VDC, 4-20 mA, jog and preset speeds). This setting is the time to decelerate from BASE frequency (60 Hz or 50 Hz) to 0 Hz. Set the desired value using the ∆ or ∇ button. Note that a value of “00” cannot be set. 21 DC Brake Time
This parameter sets the duration of the application DC Braking voltage to the motor in seconds. Keep in mind that shorter is better because of the heating effect of DC Braking voltage.
22 DC Brake Voltage
This parameter sets the magnitude of DC Braking voltage applied to the motor as a percentage of DC Bus voltage. The point at which the DC braking is activated depends on the selected Stop Method (Parameter 04).
If COAST WITH DC BRAKE is selected in Parameter 04, Stop Method, DC braking is activated within 2 seconds of the drive receiving a stop command. If RAMP WITH DC BRAKE is selected in Parameter 04, DC braking will activate when the frequency decreases to 0.2 Hz.
23 Minimum Frequency
This parameter sets the minimum output frequency of the drive for all speed reference sources except the Preset Speeds (Parameters 31 – 37). This parameter also sets the drive output frequency which corresponds to the minimum value of 0-10 VDC and 4-20 mA analog input signals.
If the parameter is changed while the drive is running, the new value will not take effect until the drive stops.
24 Maximum Frequency
This parameter sets the maximum output frequency of the drive for all speed reference sources and is used with the Minimum Frequency (Parameter 23) to define the operating range of the drive. If the High Frequency drive option is used, the highest Maximum Frequency setting is determined by the Carrier Frequency setting (Parameter 02).
!
DANGERPOSSIBLE SEVERE INJURY OR DEATH!
DO NOT OPERATE A MOTOR ABOVE ITS RATED SPEED WITHOUT APPROVAL FROM BOTH THE MOTOR AND DRIVEN MACHINE MANUFACTURER.
This parameter also sets the drive output frequency which corresponds to the maximum value of 0-10 VDC and 4-20 mA analog input signals.
25 Current Limit
This parameter sets the maximum allowable output current of the drive, which also determines the torque capability of the motor. The maximum setting is either 180% or 150%, depending upon the setting of the Line Voltage Selection (Parameter 01).
The drive will enter current limit when the load demands more current than the Current Limit setting, which results in a loss of synchronization between the drive and the motor. To regain control of the motor, the drive will automatically reduce the output frequency in an attempt to allow the motor load to decrease. The drive will return to the required operating frequency after the overload condition passes.
26 Motor Overload
MD200 drives are equipped with an overload sensing and protection function to protect the drive and are approved by UL for solid state motor overload
protection. No additional overload protective device is required. The overload function protects the drive and connected motor, from a sustained over current condition. The operation of this function allows the drive to deliver up to 150% of its rated current for one minute and higher currents for shorter periods of time. If the overload condition persists for a longer period than allowed, the drive will trip and indicate an Overload fault.
The value in this parameter is expressed as a percentage of the motor current divided by the drive current rating. For example, if a motor rated for 3.4 A is connected to a drive rated 4.8 A the ratio percentage is calculated as shown below
Once the value is calculated, set the value in this parameter.
27 Base Frequency
This parameter determines the Volts per Hertz (V/Hz) ratio by setting the output frequency at which the drive will output full voltage to the motor. In most cases, the Base Frequency should be set to match the motor’s rated frequency, usually 50 Hz or 60 Hz.
28 Fixed Boost
Fixed Boost is used in applications that require high starting torque. This increases starting torque by increasing the output voltage at lower frequencies (below 30 Hz for 60 Hz base frequency) resulting in an increased V/Hz ratio.
% 71 100 8 . 4 4 . 3 100= ⋅ = ⋅ = D M Ratio I I I
Note: Since the increased V/Hz ratio is present at low frequencies, increased motor heating will result. The boost value should be kept to the minimum value that produces the desired result and continuous low speed operation should be minimized. Refer to the Acceleration Boost parameter below for a possible better solution if long periods of low speed operation are required.
29 Acceleration Boost
Acceleration Boost is similar to Fixed Boost described above except the increased V/Hz ratio is automatically disabled after the drive reaches the set output frequency. This minimizes heating caused by a higher V/Hz ratio at low speeds.
30 Slip Compensation
A typical NEMA Design B AC induction motor operates with a Slip value of
between 2 and 3 percent. This means that as motor load increases from no load to full load, the motor will “Slip” or decrease speed by about this value. Most applications are not adversely affected by this small speed change. If motor speed must be maintained more closely, Slip Compensation may be sufficient to achieve the desired results.
Slip compensation causes the drive to boost output frequency beyond the set frequency as motor load increases. The effect is that the actual motor speed does not decrease as load increases.
The following example shows how to set the value for a motor with a 1750 RPM full load speed. Note: Synchronous speed is 1800 RPM for a 4-pole motor.
Set this parameter by entering the appropriate value in this parameter. For the example above, use either 2.7% or 2.8%. Note that the value can be adjusted as necessary to achieve the desired results.
% 77 . 2 100 ) 1800 1750 1 ( 100 ) 1 ( %= − ⋅ = − ⋅ = S R N N S
31 – 37 Preset Speed #1 to Preset Speed #7
Preset Speeds (Frequencies) are active only when the drive is from the control terminal strip. The speeds are selected by connecting one or more terminals TB13A, TB13B and/or TB13C to common (TB2). The terminals must be
programmed for Preset Speed 1, 2 or 3 for preset speed selection to work. See Parameters 10, 11 and 12 for details.
A maximum of 7 preset speeds can be selected using all three inputs. The use of two inputs allows selection of 3 preset speeds (Speed 1, Speed 2 and Speed 4). The use of one input allows selection of 1 preset speed (Speed 1). The truth table below shows the selection pattern. A “0” means that the terminal is open and a “1” means that the terminal is connected to TB2.
Preset Speed Selection Truth Table
Speed Selected TB13A TB13B TB13C
Main Speed 0 0 0 1 (Param. No. 31) 1 0 0 2 (Param. No. 32) 0 1 0 3 (Param. No. 33) 0 0 1 4 (Param. No. 34) 1 1 0 5 (Param. No. 35) 1 0 1 6 (Param. No. 36) 0 1 1 7 (Param. No. 37) 1 1 1
Note 1: If all inputs are open, the drive frequency is determined by the setting for Parameter 05, Standard Speed Source.
Note 2: If a TB13 terminal is programmed for a function other than preset speed selection, it is considered open in regards to the speed selection truth table above.