LEESON NEMA 4X SCR Control: 174903.00 (Obsolete) - Manual (Page 9)

SPEEDMASTER MODEL 174902 HOOK-UP DIAGRAM
8
SPEEDMASTER MODEL 174903 HOOK-UP DIAGRAM
BEFORE SCREWING DOWN COVER ASSEMBLY, ROUTE WIRING
THROUGH CONDUIT HOLES IN ENDPLATE BY TERMINAL STRIP.
CONNECT THE MOTOR LEADS TO P1-4 (-ARM) AND P1-5 (+ARM) AND
AC INPUT (OF PROPER VOLTAGE) TO P1-8 (AC) AND P1-9 (AC).
INSIDE OF COVER
SPEEDPOT
DPST SWITCH
(black)
ENDPLATE WITH HOLES FOR CONDUIT
(white)
(white)
-11 -9 -8 -10 -4 -5 -6 -7 -1 -2 -3
P2 Inhibit
Pin
P1
Pot Lo
Wiper Pot Hi
-Arm
+Arm
+Field -Field
AC AC
motor
armature ac input
field* chassis
ground
Switched AC Switched AC
Min Max Accel
I.R.
Comp
Cur.
Lim. LO (orange)
HI (white)
WIPER (red)
(black)
P3-1 P3-2 P1-8 P1-9
P1-4 P1-5 P1-10 P1-11
AC INPUT ARM INPUT
-7
-6
-3
-2
-1
P1
4PDT SWITCH
P3
-4
-11
-10
-5
-2
-1
-9
-8
ARM 1
ARM 2
AC
AC
black
white
brown
yellow
red
blue
purple
or brown
gray or
yellow
brown
yellow
purple
or brown
gray or
yellow
PERMITS REVERSING OF THE MOTOR. THIS IS ACCOMPLISHED USING A 4PDT BLOCKED CENTER SWITCH. WHEN SWITCHED
BETWEEN THE FORWARD/REVERSE POSITIONS, A DELAY IS ENCOUNTERED DUE TO THE BLOCKED CENTER POSITION,
WHICH PROTECTS THE CONTROL FROM ANY VOLTAGE THAT MAY BE AT THE TERMINAL. THE 4PDT SWITCH IS FACTORY
INSTALLED INTO THE COVER. THE TWO POSITION TERMINAL STRIP (P3) IS FACTORY INSTALLED ON THE MAIN BOARD
(ABOVE). THE OUTPUT ON P3 IS THE SWITCHED (FWD/REV) OUTPUT AND THE OUTPUT OF TERMINALS P1-4 AND P1-5 IS NOT
SWITCHED.
THE MOTOR MUST COME TO A COMPLETE STOP BEFORE CHANGING DIRECTIONS. IF THE MOTOR DOES NOT COME TO A
COMPLETE STOP, SERIOUS DAMAGE TO THE CONTROL MAY RESULT. BYPASS OF THE CENTER BLOCK OF THE SWITCH MAY
RESULT IN DAMAGE TO THE CONTROL.