KB Electronics KBAC-48 - Manual (Page 26)

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13.8 Boost (BOOST) – The drive is factory set for Fixed Boost
(Jumper J6 set to the “FIX” position). When the drive is set for
Adjustable Boost (Jumper J6 set to the “ADJ” position), the BOOST
Trimpot can be used to adjust the amount of boost voltage to the
motor. See Figure 38. Also see Section 6.5 on page 19.
Application Note – The Boost function operates over a frequency
range of 0 – 15 Hz. If the frequency range required is above 15 Hz,
Boost adjustment is not necessary.
WARNING! To avoid motor winding overheating and failure,
do not overboost the motor.
Note: An unloaded motor with excessive boost will draw more
current than a partially loaded motor.
The boost voltage may be adjusted as follows:
1. Wire an AC RMS ammeter in series with one motor phase.
2. Run the motor unloaded at approximately 4 Hz (or 120 RPM).
3. Increase the boost until the ammeter reaches the motor
nameplate rated current (Amps AC).
4. Using the Main Speed Potentiometer, slowly adjust the
motor speed over a 1 – 15 Hz (0 – 450 RPM) range. If the
motor current exceeds the nameplate rating, decrease the boost setting.
13.9 Jog (JOG) – The Jog feature requires the installation of a Run-Stop-Jog Switch. The switch must be
wired according to Figure 39. The JOG Trimpot range is shown in Figure 39.
The orange Main Speed Potentiometer wire (wiper) which connects to Terminal “P2” on the drive
must be removed and installed on Terminal “RUN” on the switch. The “JOG” Terminal on the drive
connects to “JOG” on the switch. Terminal “P2” on the drive connects to the center (common)
terminal on the switch.
When the switch is in the “JOG” position, the JOG Trimpot is used to set the “jog” speed. When the
switch is in the “RUN” position, the Main Speed Potentiometer is used for speed setting.
The Run-Stop-Jog Switch (Part No. 9340) is available as an optional accessory. See Table 2 on page 8.
BOOST
(Shown Factory Set to 5 Volts/Hz)
5
0
8
30
22
15
Figure 38 – Boost
Trimpot Range
35
JOG
(Shown Factory Set to 35% Frequency Setting)
0
25
100
75
50
Figure 39 – Jog
Trimpot Range
Run-Stop-Jog Switch
P3 P2
Orange (Wiper)
(JOG)
(P2)
White (Low) (P1)
Potentiometer
Violet (High) (P3)
Main Speed
CL JOG COMP BOOST ACCEL DECEL
JOG
MAX MIN
P1
J2
Jog Trimpot
(SPDT - Center Off)
(Wiper)
E
D
A
C
B
M
A
J3
Figure 40 – Run-Stop-Jog Switch Connection (SPDT – Center Off)