Control Modifications; Two Speed Operation; Dynamic Braking - DART Controls 125D Manuel D'instructions

TWO SPEED OPERATION

Two pot operation is done using two 10K
ohm speed potentiometers in parallel (both
HI's to P1-6, both LO's to P1-8). The
WIPER is switched using a SPDT switch.
TWO 10K SPEEDPOTS
P1
-8
-7
SPDT
-6
TACHOMETER FEEDBACK
Improves speed regulation to ±1/2% of base speed.
+
6 VDC at BASE SPEED (3 VDC at
TACHOMETER
1000 RPM for 1800 RPM MOTOR)
-
INHIBIT (USED INDEPENDENTLY)
The customer supplied SPST switch is
connected in series between the speedpot HI
(P1-6) and the Inhibit pin (P3). To inhibit (stop
motor), speedpot HI is closed to the Inhibit pin.
To restart, the switch is returned to open. NOTE:
The control will stop and start fast.
LO
WIPER
SPEEDPOT
HI
NOTE: Permits starting and stopping of motor without breaking AC lines. In the event of SCR failure or false
triggering, the Inhibit circuit will not stop motor.
Always use a shielded wire when connecting to the inhibit terminal. The shield should be connected to
-Armature or Common of the control.

CONTROL MODIFICATIONS

LO LO
W W
HI HI HI
P3 INHIBIT
P1-4 -ARM
NOTE: NEED 1% OR LESS - TACH OUTPUT RIPPLE
INHIBIT
P1
(P3)
-8
-7
SPST
-6

DYNAMIC BRAKING

A DPDT switch is used to inhibit the control and to connect the
DBR. Typical values for the DBR (dynamic brake resistor) are 5
ohms for 120V, 10 ohms for 240V (both 35W to 50W). Note that
motor horsepower, inertia, and cycle time effect sizing of the DBR.
NOTE: This modification cannot be used with any of the -15 options.
P1
LO
-8
-7
W
-6
HI
-5
-4
-3
TACHOMETER FOLLOWER
Allows control output to follow tachometer voltage.
+
TACHOMETER
-
INHIBIT (USED WITH SPEEDPOT)
The Common of the SPDT switch is connected to
control pot HI and is switched between Speedpot
Hi and the Inhibit pin (P3). To inhibit (stop motor),
speedpot HI is closed to the Inhibit pin. To restart,
the switch is returned to Speedpot Hi. NOTE: The
control will stop fast and soft start through a fixed
acceleration range.
P1
LO
-8
WIPER
-7
HI
-6
6
P3
INHIBIT
Switch or relay must
be rated to 3 times
the Full Load Amps.
DPDT SWITCH (N.C.)
DYNAMIC
MOTOR
BRAKE
RESISTOR
P1-7 POT WIPER
12 VDC at FULL SPEED
P1-8 POT LO
INHIBIT
SPEEDPOT
(P3)
SPDT