Page 11
IronHorse GSD7 DC Drives User Manual – 1st Ed, Rev C – 10/24/2018
S
TarT
-U
p
a
ll
Power
MUst
be
off
before
ProCeeDinG
.
1)
Recheck all wiring Accidental grounds, loose or pinched wires on armature or speed pot wires may
damage the DC drive when power is applied
2)
Check to see that the incoming power is of the correct voltage
3)
Turn the speed pot to zero (fully CCW)
4)
Turn power on, close contact from COM (P4-7) to either FWD (P4-6) or REV (P4-5), and advance the
speed pot while observing motor direction of rotation
Power must be turned off again before step 5 can be accomplished!
5)
If the motor rotation is incorrect, turn power off at external disconnect, and reverse the A1 and A2
(P4-3 & P4-4) motor armature connections
6)
Check for satisfactory operation throughout the speed range
7)
If operation is satisfactory, no readjustments are needed
8)
If instability or surging is observed, or if minimum and maximum speed settings need further
adjustments, then refer to the “Trim pot Adjustments” section”
9)
For other problems, consult the “Troubleshooting” section
T
riM
p
OT
a
DjUSTMenTS
If the system is unstable after the previous Start-Up procedure, then adjust the trim pots as follows.
These adjustments are maintained, and periodic readjustments are not normally needed. However,
readjustments could be needed if the drive is operated beyond ±10% of the rated line voltage.
GSD7-xxx-xxxxx Trim pot Adjustment
Trim pot Function
Adjustment
Max
Sets maximum motor
speed when speed pot is
set at maximum (fully CW
rotation) CW rotation of
MAX trim pot increases
maximum motor speed
1) TURN DRIVE POWER OFF!!
2) Connect a DC Voltmeter across A1 and A2
NOTE: Meter must not be grounded!!
3) Set meter voltage range if needed: (90 VDC for 120 VAC; 180VDC for 240
VAC)
4) Turn power ON Select a direction and set Speed pot at100%
5) Adjust the MAX trim pot to rated motor armature voltage as shown on
meter
NOTE: A tachometer or strobe may be used in lieu of a meter. Follow
above steps, except adjust MAX trim pot to rated motor base speed indicated
by tachometer or strobe.
Min
Sets minimum motor speed
when speed pot is set at
zero CW rotation will
increase minimum motor
speed
1) Select a direction and set Speed pot to zero (fully CCW)
2) Rotate MIN trim pot CW until motor starts to rotate
3) Slowly rotate MIN trim pot CCW until motor stops
NOTE
: If motor rotation
is desired, rotate MIN trim pot CW until desired MIN speed is reached
IR Comp
Provides a means of
improving motor speed
regulation If a slowdown
due to load change is of no
concern, rotate this trim pot
fully CCW
1) Select a direction and set Speed pot at 50%
2) Observe motor speed at no load condition
3) Apply full load to motor
4) Turn IR COMP trim pot CW until you obtain the same motor speed as the no
load condition
Cur Lim
Limits DC motor armature
current (torque) to prevent
damage to the motor or
drive The current limit
is set for the rated motor
current CW rotation of
this trim pot increases the
armature current (or torque
produced)
1) TURN DRIVE POWER OFF!
2) Connect a DC ammeter between A1 on motor and A1 on the control This is
in series with the motor
NOTE: Meter must not be grounded!!
3) Turn power ON
4) Select a direction and set Speed pot at the 50% position
5) Apply friction braking to motor shaft until motor stalls
6) With motor stalled, set current at 125% of rated motor armature current by
adjusting CUR LIM trim pot
