Setting Armature Voltage With Jumper J3 - KB Electronics KBPC-240D Installation And Operation Manual Supplement

For 230VAC line input, the
armature voltage is normally set
to"180V". However, it is also
possible to operate in a Step-
Down Mode (90 – 130VDC motor
with a 230VAC line) by setting J3
to "90". However, reduced
performance may result.
If tach-generator feedback is to be
used, J3 must be placed in the "T"
position and an external DC tach-
generator must be connected. See section II, F, p. 9, and section IV, E on page 11 for
additional information.
D. J4 – Armature Current – Select the J4 position (2.5A, 5A, 7.5A, 10A) closest to the rated
motor current. Note that the output is factory set to 150% of the J4 position (e.g. 15 amps
in the 10A position and 11 amps in the 7.5 position, etc.). This setting can be readjusted
using the CL trimpot (see section VII, E on page 14).
TABLE 5 – JUMPER J4 SETTING vs MOTOR HORSEPOWER
JUMPER J4*
10.0 Amps
7.5 Amps
5.0 Amps
2.5 Amps
Note: Jumper J4 is shown in the factory setting.
Application Note – Subfractional Horsepower Motors. For subfractional motors with
current ratings below 2.5 amps, the KBPC can be modified as follows. Note: Before
making this modification you must have a .05 ohm Plug-in Horsepower Resistor
9839). Carefully clip out the large power resistor R69 on the printed circuit board. The
resistor location is indicated in fig. 1, p. 3.) Insert the .05 ohm Plug-in Horsepower
®
Resistor into the two (2) pins located under the resistor R69. Each of the current
selection values are now divided by 10. See table 6 below.
TABLE 6 – CURRENT LIMIT SETTINGS with .05 OHM
PLUG-IN HORSEPOWER RESISTOR INSTALLED
Original J4 Current
Jumper Selection
10.0 Amps
7.5 Amps
5.0 Amps
2.5 Amps
E. J5 – Current Limit Mode – (Factory set for "TCL") This control contains electronic
current limiting which limits the maximum DC current to the motor
(the current limit set point is established with the selection of the
J4 position and the setting of the CL trimpot). Two modes of
current limit operation are provided:
8
Control Set for 180 VDC
1/3 – 1/2
1/6 – 1/4
New J4 Current New Current Limit
Jumper Selection
1.0 Amps
0.75 Amps
0.5 Amps
0.25 Amps
TABLE 4 – SETTING ARMATURE
VOLTAGE WITH JUMPER J3
(Factory Setting)
180V
90V
Motor Horsepower Range
90 VDC
1
3/4
New Current Limit Trimpot
Trimpot Range
0 – 2.0 Amps
0 – 1.5 Amps
0 – 1.0 Amps
0 – 0.5 Amps
Control Set for 90 VDC
180V
90V
180 VDC
2
1
3/4 – 1
1/3 – 1/2
®
(KB P/N
Factory Setting
1.50 Amps
1.13 Amps
0.75 Amps
0.38 Amps