KB Electronics KBRC-240D User Manual

Page 15

Note: If Jumper J3 is set to the “T7” or “T50” position, a tach-generator must be wired to
Terminal Block TB3. If a tach- generator is not used, Jumper J3 must be in either the
“A180” or “A90” position. If jumper J3 is in the “T7” or “T50” position, and a tach-gener-
ator is not used, the motor will accelerate to full speed and the Main Speed Potentiometer
will not control speed.

C. DC Tach-Generator Voltage Selection

(J3) – Jumper J3 is factory set to the
“A180” position for 180 Volt motors. When
connecting a tach-generator to Terminal
Block TB3, set Jumper J3 to the corre-
sponding voltage of the tach-generator
being used. See Figure 19.

Note: If using a tach-generator other than
7V or 50V per 1000 RPM, see Section IIIK,
on page 13.

D. Motor Current Selection (J4) – Jumper J4 is factory set to the “10A” position for 10 Amp

motors. For lower current motors, set Jumper J2 to the corresponding current of the
motor being used. See Figure 20 and Table 6.

E. Analog Input Signal Voltage Selection

(J5) – Jumper J5 is factory set to the
“15V” position for use with a potentiome-
ter to control motor speed. To control
motor speed using a 0 - ±10 Volt DC iso-
lated analog signal voltage set Jumper
J5 to the “10V” position. To control
motor speed using a 0 - ±15 Volt DC iso-
lated analog signal voltage, set Jumper
J5 to the “15V” position. See Figure 21.

Note: Connect the isolated signal volt-
age to SIG (signal) and COM (-) termi-
nals. If an isolated analog signal voltage is not available, install the optional Signal
Isolator SIRC (P/N 8842).

FIGURE 19 – DC TACH-GENERATOR

VOLTAGE SELECTION

FIGURE 20 – MOTOR CURRENT SELECTION

TABLE 6 – SETTING MOTOR CURRENT

FIGURE 21 – ANALOG INPUT SIGNAL

VOLTAGE SELECTION

J3 Set for 7V per 1000

RPM Tach-Generator

J3 Set for 50V per 1000

RPM Tach-Generator

J5 Set for

0 – ±15 Volt Input Signal

(Factory Setting)

J5 Set for

0 – ±10 Volt Input Signal

15V

10V

15V

10V

J4 Set for

10 Amp Motor

(Factory Setting)

J4 Set for

7.5 Amp Motor

J4 Set for

5 Amp Motor

J4 Set for

2.5 Amp Motor

J4 Set for

1.7 Amp Motor

J4 Setting (Amps DC)

SCR Rated Motor Horsepower – HP, (kW)

90 Volt DC Motors

180 Volt DC Motors

1.7

1/6, (0.1)

1/3, (0.25)

2.5

1/4, (0.18)

1/2, (0.37)

5.0

1/2, (0.37)

1, (0.75)

7.5

3/4, (0.5)

⁄

, (1)

1, (0.75)

2, (1.5)