KB Electronics KBMM-225D - Manual (Page 19)

tach-generator. Connect one end of RT to Terminal
“T”, connect the other end of RT to the tach-
generator positive lead (+), and connect the negative
lead (-) of the tach-generator to Terminal “I2”. See
Figure 10.
The value of RT (
Ω) can be calculated using the fol-
lowing formula: RT = (1.3 X VT X S) - 16000
Ω
Where “VT” is the tach-generator voltage (in Volts
per 1000 RPM) and “S” is the base speed of the
motor (in RPM).
Example: If a 20 Volt per 1000 RPM tach-generator
is to be used with a 3600 RPM motor:
RT = (1.3 X 20 X 3600) - 16000 = 77600
Ω
Choose the closest 1/2 Watt resistor value, which is 75000
Ω (75 kΩ).
7 SETTING SELECTABLE JUMPERS
The control has selectable jumpers which must be set before it can be used. See Figure 1, on page 10, for the
location of jumpers.
7.1 AC Line Input Voltage Selection (Jumper J1 (Model KBMM-225D Only)) – Jumper J1 is factory set to
the “230” position for 208/230 Volt AC line input. For 115 Volt AC line input, set Jumper J1 to the “115”
position. See Figure 11, on page 20.
Notes: 1. Jumper J1 is installed on Model KBMM-225D only. 2. When Jumper J1 is set to the “115” posi-
tion, Jumper J2 must be set to the “90” position (or the “T” position if using a tach-generator).
19
B
PWR ON
I2
T
G
DC Tach-Generator
-
+
RT
J2
FIGURE 10 – OTHER DC TACH-GENERATOR
CONNECTION