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ページを印刷するInstallation and Wiring – Wiring Diagrams (continued)
GSD5-240-xxx Two-Speed Operation
Two-speed operation is done using
two 10 kΩ speed potentiometers in
parallel, with both Highs connected
to terminal P1-3, and both Lows
connected to P1-1. A SPDT switch
selects which pot Wiper is connected
to terminal P1-2.
P1
1
2
SPDT
3
GSD5-240-xxx Tachometer Feedback
Improves regulation to ± 1/2 of base speed.
+
Tachometer
–
Tachometer control needs tachometer output of 7VDC/1000rpm with ripple limited to 1% or
less.
GSD5-240-xxx Inhibit (used independently)
The customer-supplied SPST switch is
connected in series between the Speed Pot
High (P1-3) and the Inhibit pin (P2). To Inhibit
(stop motor), close Speed Pot High to the
Inhibit pin. To restart, return the switch to
open. NOTE: The control will stop and start
fast; Accel is bypassed.
SPEEDPOT
1) Inhibit control will stop and start the motor quickly.
2) Inhibit control permits starting and stopping the motor without breaking the AC lines.
3) In the event of SCR failure or false triggering, the Inhibit circuit will not stop the motor.
4) Always use shielded wire when connecting to the Inhibit terminal, and connect the shield
to the -Armature or Common of the drive.
IronHorse GSD5 DC Drives User Manual – 1st Ed, Rev E – 05/13/2020
(2) 10kΩ Speedpots
LO
LO
W
W
HI
HI
P2 Inhibit
6VDC at Base Speed (3VDC at
1000 rpm for 1800 rpm motor)
P1-4 -Arm
INHIBIT
P1
(P2)
LO
1
WIPER
2
SPST
HI
3
GSD5-240-xxx Dynamic Braking
A DPDT switch is used to control and to connect a
customer-supplied Dynamic Braking Resistor (DBR).
Typical values for the DBR are 35–50W at 5Ω for 120V,
or 10Ω for 240V. Motor horsepower, inertia, and cycle
time affect the sizing of the DBR.
P1
LO
1
2
W
3
HI
4
5
6
GSD5-240-xxx Tachometer Follower
Allows drive output to follow tachometer
voltage.
+
Tachometer
–
GSD5-240-xxx Inhibit (used with speed pot)
The common of the SPDT switch is connected
to control pot High, and is switched between
Speed Pot High (P1-3) and the Inhibit pin
(P2). To inhibit (stop motor), Speed Pot High
is closed to the Inhibit pin. To restart, return
the switch to Speed Pot High. NOTE: The
control will stop fast and soft start through a
fixed acceleration rangee.
P1
1
2
3
P2 INHIBIT
DPDT SWITCH (N.C.)
DYNAMIC
BRAKE
MOTOR
RESISTOR
P1-2 Pot Wiper
12 VDC at Full Speed
P1-1 Pot Lo
INHIBIT
SPEEDPOT
(P2)
LO
WIPER
SPDT
HI
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