housed in a NEMA-1 / IP-40 enclosure. They are designed to operate 208 230
Volt 50 & 60 Hz 3-phase AC induction motors from 1/8 HP thru 1 HP. The sine
wave coded Pulse Width Modulated (PWM) output operates at a carrier frequency
of 16 kHz, which provides high motor efficiency and low noise. Adjustable Linear
Acceleration and Deceleration make the drive suitable for soft-start applications.
The Motor Horsepower Selection Jumper allows the drive to be used on a wide
range of motor horsepower (1/8, 1/4, 1/2, 3/4, 1 HP) without recalibration or
programming. Model KBMA-24DF contains a built-in AC line Class A RFI (EMI)
filter which meets the CE Council Directive 89/336/EEC Industrial Requirement.
Its user-friendly design makes the KBMA easy to install and operate. Setting
the drive to specific applications is accomplished with selectable jumpers and
trimpots, which eliminates the computer-like programming required on other
drives. However, for most applications no adjustments are necessary. For more
advanced programming, PC based Drive-Link software is available.
Main features include adjustable RMS Current Limit and I
2
t Motor Overload
Protection.
1
In addition, Adjustable Slip Compensation with Static Auto-Tune and
Boost provides high torque and excellent load regulation over a wide speed
range. Power Start delivers over 200% motor torque to ensure startup of high
frictional loads. Electronic Inrush Current Limit (EICL) eliminates harmful AC line
inrush current. A Run/Fault Relay is provided, which can be used to turn on or off
equipment or to signal a warning if the drive is put into the Stop Mode or a fault
has occurred.
Standard front panel features include an On/Off AC Line Switch, a Pilot Light
for power on, and a Main Speed Potentiometer. Other features include PC board
mounted diagnostic LEDs (Power On (ON), Drive Status (ST) and Overload (OL)),
Barrier Terminal Blocks to facilitate wiring (AC line, motor, ground (earth), and
Run/Fault Relay Output Contacts), adjustable trimpots (MIN, MAX, ACCEL,
DECEL, COMP, CL), customer selectable jumpers (AC Line Input Voltage
Selection, Motor Horsepower, Automatic or Manual Start and Reset
5
, Motor
Frequency, Frequency Multiplier, Run or Fault Output Relay Operation).
Optional accessories include: Forward-Stop-Reverse Switch
5
, AC Line Filter,
and Programming Kit.
STANDARD FEATURES Simple to Operate: Does not require programming. Uses trimpots and jumpers,
which are factory set for most applications. Motor Horsepower Selection Jumper: Allows the drive to be used on a wide
range of motor horsepower (1/8, 1/4, 1/2, 3/4, 1 HP) without recalibration or
programming. Diagnostic LEDs: PC board mounted LEDs for Power On (ON), Drive Status (ST),
and Overload (OL). Run/Fault Relay Output Contacts: Can be used to turn on or off equipment or
to signal a warning if the drive is put into the Stop Mode or a fault has occurred. Barrier Terminal Blocks: Facilitate wiring of AC line, motor, ground (earth), and
Run/Fault Relay Output Contacts. On/Off AC Line Switch: Panel mounted. Used to turn the power on or off to
the drive. Pilot Light: Panel mounted. Indicates that power is applied to the drive. Main Speed Potentiometer: Panel mounted. Provides adjustment of motor speed. Jumper Selection of Drive Output Frequency: Increases the motor speed up to
two times the rated RPM. Compatible with GFCIs (with optional software).
PERFORMANCE FEATURES Power Start: Provides more than 200% starting torque which ensures startup
of high frictional loads. Slip Compensation with Static Auto-Tune and Boost: Provides excellent load
regulation over a wide speed range. Speed Range: 60:1
PROTECTION FEATURES Motor Overload (I
2
t) with RMS Current Limit: Provides motor overload protection
which prevents motor burnout and eliminates nuisance trips.
1 Electronic Inrush Current Limit (EICL): Eliminates harmful inrush AC line current
during startup. Short Circuit: Shuts down the drive if a short circuit occurs at the motor
(phase-to-phase). Regeneration: Eliminates tripping due to bus overvoltage caused by rapid
deceleration of high inertial loads. Overvoltage and Undervoltage: Shuts down the drive if the AC line input voltage
goes above or below the operating range. MOV input transient suppression. Microcontroller self monitoring and auto-reboot.
TRIMPOT ADJUSTMENTS Minimum Speed (MIN) Maximum Speed (MAX) Acceleration (ACCEL) Deceleration (DECEL) Slip Compensation (COMP) Current Limit (CL)
SELECTABLE JUMPERS AC Line Input Voltage Selection (115/230 Volts AC) (J1) Motor Horsepower (1/8, 1/4, 1/2, 3/4, 1 HP) (J2) Automatic or Manual Start and Reset (J3) Frequency Multiplier (1X, 2X) (J4) Motor Frequency (50/60 Hz) (J5) Runor Fault Output Relay Operation (J6)
Notes: 1. UL approved as an electronic overload protector for motors. 2. Model KBMA-24D only. 3. Use Model
KBMA-24DF or install CE approved RFI (EMI) Filter. See AC Line Filters, in Optional Accessories. 4. Requires optional
software. 5. The optional Forward-Stop-Reverse Switch is required for Manual Start.
KBMA Adjustable Frequency Drives
for 1/8 HP thru 1HP 3-Phase AC Motors
rated 208 230 VAC, 50 & 60 Hz
NEMA-1 / IP-40
3
2
DATA SHEET D-812
Model KBMA-24D (Part No. 9533) Model KBMA-24DF (Part No. 9534)









COPYRIGHT © 2006 KB Electronics, Inc.
2
Description
Specification
Factory Setting
115 Volt AC Line Input Voltage Operating Range (Volts AC)
1
115 (±15%) 208/230 Volt AC Line Input Voltage Operating Range (Volts AC)
1
208 (-15%) / 230 (+15%)
2 Maximum Load (% Current Overload for 1 Minute)
150 Horsepower Selection (HP) (J2)
1/8, 1/4, 1/2, 3/4, 1
1
Carrier, Switching Frequency (kHz)
16, 8 Output Frequency Resolution (Bits, Hz)
10, .06 Minimum Speed Trimpot (MIN) Range (% Frequency Setting)
0 40
0
Maximum Speed Trimpot (MAX) Range (% Frequency Setting)
70 110
100
Acceleration Trimpot (ACCEL) and Deceleration Trimpot (DECEL) Range (Seconds)
.3 20
1.5
Slip Compensation Trimpot (COMP) Range at Drive Rating (Volts/Hz)
0 3
1.5
Current Limit Trimpot (CL) Range (% Full Load)
0 200
160
Motor Frequency Setting (Hz) (Jumper J5)
50, 60
60
Output Frequency Multiplier (1X, 2X) (Jumper J4)
3
1, 2
1
Minimum Operating Frequency at Motor (Hz)
0.3 Speed Range (Ratio)
60:1 Speed Regulation (30:1 Speed Range, 0 Full Load) (% Base Speed)
4
2.5 Overload Protector Trip Time for Stalled Motor (Seconds)
6 Undervoltage/Overvoltage Trip Points for 115 Volt AC Line Input (±5%) (Volts AC)
1
76 141 Undervoltage/Overvoltage Trip Points for 208/230 Volt AC Line Input (±5%) (Volts AC)
1
151 282 Run/Fault Relay Output Contact Rating (Amps at 30 Volts DC, 125 Volts AC, 250 Volts AC)
1, 0.5, 0.25 Operating Temperature Range (°C / °F)
0 45 / 32 113 Notes: 1. Do not operate the drive outside the specified AC line input voltage operating range. 2. The drive is factory set for 208/230 Volt AC line input (Jumper J1 not installed). For 115 Volt AC line input, install Jumper J1 (supplied). See Figure
4, on page 4. 3. Allows the motor to operate up to two times the rated RPM. Constant motor horsepower will result when operating the drive in the 2X mode above the motor nameplate rated RPM. 4. Dependent on motor performance.
TABLE 1 GENERAL PERFORMANCE SPECIFICATIONS
Model
Part No.
AC Line Input
Fuse or Circuit
Breaker Rating
(Amps)
Output
Net Weight
Volts AC
(50/60 Hz)
Phase
(
)
Maximum Current
(Amps AC)
Voltage Range
(Volts AC)
Maximum Continuous Load Current
(RMS Amps/Phase)
Maximum Horsepower
(HP (kW))
Lbs.
kg
KBMA-24D
9533
115
1
16
20
0 230
3.6
1 (.75)
2.42
1.09
208/230
1
1
10
15
KBMA-24DF
2
9534
115
1
16
20
0 230
3.6
1 (.75)
2.48
1.12
208/230
1
1
10
15
TABLE 2 ELECTRICAL RATINGS
Notes: 1. The drive is factory set for 208/230 Volt AC line input (J1 not installed). For 115 volt AC line input, install Jumper J1 (supplied). See Figure 4, on page 4. 2. Model KBMA-24DF contains a built-in AC line Class A RFI (EMI) filter which
meets the CE Council Directive 89/336/EEC Industrial Requirement.
FIGURE 1 MECHANICAL SPECIFICATIONS (Inches/mm)
9.0
0.35
5.08
0.2
4x ø
4x ø 9.91
0.39
4.30
109
5.10
130
7.00
178
126
4.95
7.6
0.30
27.9
1.10
Standard 3/4" Fittings
5.10
130
1.45
36.8
44.5
1.75
0.95
24.1
0.95
24.1
1.00
25.4
3.20
2.35
59.7
81.3
105
4.15
Back view is shown dimensioned
Side view is shown dimensioned
with the cover installed.
Recommended tightening torque for the
two front cover screws: 5 in-lbs (6 kg-cm).
without the cover installed.
"Knockouts" for
DATA SHEET D-812 3
COPYRIGHT © 2006 KB Electronics, Inc.
Main Speed Potentiometer
Front Cover Screws
On/Off AC Line Switch
Pilot Light
Provision for Optional
Forward-Stop-Reverse Switch
CON2: Used for optional Forward-Stop-Reverse Switch.*
* The optional Forward-Stop-Reverse Switch is required for Manual Start.
Main Speed Potentiometer Terminals (P1, P2, P3).
Adjustable Trimpots (CL, MAX, MIN, ACCEL, DECEL, COMP).
J4: 1X or up to 2X Rated Motor RPM Operation.
J6: "Run" or "Fault" Output Relay.
J3: Automatic or Manual Start and Reset Operation.*
TB1: AC Line Input, Motor, Ground, and connections. See Figure 5, on page 4.
J5: 60 Hz or 50 Hz Motor Operation.
TB2: Run/Fault Relay Output Contacts.
J2: Motor Horsepower.
Jumpers and trimpots are shown in factory set positions.
CON1: Used to connect optional accessories to the drive.
Install jumper for 115 Volt AC line input. See Figure 4, on page 4.
J1: AC Line Input Voltage selection.
Diagnostic LEDs (Power On, Status, Overload).
Main Speed Potentiometer
(Front View)
Panel Mounted
Violet
Orange
White
Pilot Lamp
Panel Mounted
On/Off AC Line Switch
(Back View)
Panel Mounted
Black
Blue
Blue
Black
White
White
L1A
L1B
L2A
L2B
CON1
1
1
5
V
A
C
J1
J
1
-
A
A
B
J
1
-
B
U
GND
V
W
L1
L2
TB1
MOTOR
AC LINE
N.O.
COM
N.C.
TB2
OL
ON
ST
F
R
S
CON2
P
1
P
2
P
3
J6
FLT
RUN
FREQ
50HZ
60HZ
J5