KB Electronics KBRG-255 - Manual (Page 14)

10
FIG. 7E – TACH-GENERATOR
CONNECTION
FIG. 7B – ENABLE FIG. 7C – START/STOP CIRCUIT
4 3
RY1
CONTACTS
ALARM
TB1
FIG. 7D – ALARM CONTACTS
TABLE 6 – CONTROL STATE vs RELAY CONTACT STATE
Relay Contact State
Description of Control State Using Start / Stop Start / Stop Bypassed
No power to control O O
Power applied O X
Control in Stop mode O NA
Control is started with Start button X NA
Control has “Timed Out” in TCL O NA
O – Open, X – Closed, NA – Not Applicable
J. Tach-generator Input – Terminals "1" and "2" are used
to connect a DC tach-generator and should be used only
when control is in Tach-generator Feedback mode (J5 is
in "TFB" position). Connect the positive (+) tach lead to terminal
"1" and the negative (-) tach lead to terminal "2." Note: The tach-
generator polarity must be phased so that the tach voltage is positive
(+) on terminal "1" when the voltage on terminal "12" is positive (+).
If the tach-generator is wired backwards, the control will run at full
speed only.
VI. FUSING.
The logic control board contains a low amperage fuse (.150 amp Littelfuse 3AG normal blo or
equivalent) which protects the control transformer and other components against catastrophic
failure. Under normal circumstances, this fuse should never blow. (See fig. 1, p. 3, for
location.)
The KBRG-255 does not contain AC line or armature fusing. It is recommended that a 40
Amp fuse or circuit breaker be installed on each AC line conductor not at ground potential.
Do not fuse ground or neutral wires.
VII. OPERATION.
WARNING! Read Safety Warning on page 2 before attempting to operate or
severe injury or death can result.
After the KBRG-255 has been set up and the drive has been properly wired, the startup
procedure can begin. Before initially starting, be sure main speed pot is in minimum position.
(Set main speed pot to full CCW position if wired for unidirectional operation and to center
position if wired for bidirectional control. (See fig. 6, p. 9.)
Start control by applying AC power. Enable circuit must be closed for control to start (jumper
terminals "8" and "9"). If wired for start/stop operation, press start switch. If not wired for
start/stop, terminals "5" and "7" must be jumpered. Rotate main speed potentiometer to control
motor speed.