30
13.6 Slip Compensation (COMP) – Sets the amount of Volts/Hz to
maintain set motor speed under varying loads. The COMP Trimpot
is factory set to 1.5 Volts/Hz, which provides excellent speed regu-
lation for most motors. To increase the slip compensation, rotate
the COMP Trimpot clockwise. To decrease the slip compensation,
rotate the COMP Trimpot counterclockwise. See Figure 39.
The slip compensation may be adjusted as follows:
1. Wire an AC RMS ammeter in series with one motor phase.
2. Run the motor and set the unloaded speed to approximately
50% (900 RPM on 4-pole 1500/1725 RPM motors).
3. Using a tachometer, record the unloaded speed.
4. Load the motor to the nameplate rated current (AC Amps).
5. Adjust the COMP Trimpot until the loaded RPM is equal to the
unloaded RPM.
6. The motor is now compensated to provide constant speed
under varying loads.
13.7 Motor Overload (I
2
t) With RMS Current Limit (CL)* – Sets the
current limit (overload), which limits the maximum current to the
motor, which prevents motor burnout and eliminates nuisance trips. The CL Trimpot is factory set
to 160% of the drive rated current. To increase the current limit, rotate the CL Trimpot clockwise.
To decrease the current limit, rotate the CL Trimpot counterclockwise. See Figure 40. Also see Figure
41 on page 31.
*UL approved as an electronic overload protector for motors.
0.3
(Shown Factory Set to 1.5 Seconds)
DEC/I
20
3
1.5
17
10
Figure 37 – Deceleration
Trimpot Range
(Shown Factory Set to 49 Volts for 1.2 Seconds)
57, 1.0
DEC/I
23, 3.0
43, 1.5
49, 1.2
31, 2.5
40, 2.0
(Shown Factory Set to 98 Volts for 1.2 Seconds)
114, 1.0
DEC/I
46, 3.0
86, 1.5
98, 1.2
62, 2.5
80, 2.0
Models KBAC-24D, 27D, 29, KBAC-217 Series
Models KBAC-45, 48, KBAC-416 Series
Figure 38 – DC Injection Brake Trimpot Range
COMP
(Shown Factory Set to 1.5 Volts/Hz)
0
0.8
3
2.3
1.5
Figure 39– Slip Compensation
Trimpot Range
CL
(Shown Factory Set to 160% Full Load)
40
200
80
160
120
Figure 40 – Current Limit
Trimpot Range
(Shown Factory Set to 0% Frequency Setting)
0
MIN
40
15
35
30
Figure 34 – Minimum Speed
Trimpot Range
(Shown Factory Set to 100% Frequency Setting)
70
MAX
110
75
90
100
80
Figure 35 – Maximum Speed
Trimpot Range
0.3
(Shown Factory Set to 1.5 Seconds)
ACCEL
20
3
1.5
17
10
Figure 36 – Acceleration
Trimpot Range
The DC Injection Brake voltage and time range is 10% of full drive output voltage for 3 seconds with
the trimpot fully clockwise and 25% of full drive output voltage for 1 second with the trimpot fully
counterclockwise. Models KBAC-24D, 27D, 29, KBAC-217 Series are factory set for 49 Volts for 1.2
seconds and Models KBAC-45, 48, KBAC-416 Series are factory set for 98 Volts for 1.2 seconds.
Adjust the trimpot so that the load stops within the required time.
Summary of Contents for KBAC Series
Page 34: ...34 Notes...
Page 35: ...35 Notes...
