Control Modifications; Two Speed Operation; Dynamic Braking - DART Controls 250G CONTROL Serie Manual Del Usuario

TWO SPEED OPERATION

Two pot operation is done using two 10K
ohm speed potentiometers in parallel (both
HI's to P1-3, both LO's to P1-1). The
WIPER is switched using a SPDT switch.
TWO 10K SPEEDPOTS
P1
W
-1
-2
SPDT
-3
TACHOMETER FEEDBACK
Improves speed regulation to ±1/2% of base speed. Contol
goes to full output when input goes to zero, above and
beyond MAX trimpot setting
+
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 (P1-3) and the
Inhibit pin (P2). To inhibit, speedpot HI is closed to
the Inhibit pin. To restart, the switch is returned to
open. NOTE: The control will stop and start fast,
accel is bypassed.
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
HI HI HI
P2 INHIBIT
P1-4 -ARM
NOTE: NEED 1% OR LESS - TACH OUTPUT RIPPLE
INHIBIT
P1
(P2)
-1
-2
SPST
-3

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 the -17B option.
P1
LO
-1
-2
W
-3
HI
-4
-5
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 (P2). 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
-1
WIPER
-2
HI
-3
8
P2
INHIBIT
DPDT SWITCH (N.C.)
DYNAMIC
MOTOR
BRAKE
RESISTOR
P1-2 POT WIPER
12 VDC at FULL SPEED
P1-1 POT LO
INHIBIT
SPEEDPOT
(P2)
SPDT