Instruction manual
12
QUICK START - EXTENDED SPEED, WEAKENED FIELD OPERATION
(REFER TO FIG 5 page 22)
NOTE: If the Armature control has no 7v/1000 rpm input omit step 6 & 9.
1) Make preparations to measure the armature voltage with a DC voltmeter.
2) Have a tachometer ready to measure the motor shaft or machine speed.
3) Pre-set pots and jumpers as follows:
On the FR1000-000, FR3500-000:
a) J3, CONTROL MODE, jumper on the Control Board to MAN position.
b) Wire jumper on TB1, 2-3.
c) P4, MAX FIELD CURRENT, to full CCW.
d) P5, CROSSOVER, full CW.
e) P3, MIN FIELD CURRENT, full CCW.
f) J1, CURRENT RANGE, (Power Board) near base field current.
g) J5, TACH VOLTS, to tachometer voltage at full speed.
h) J4, ARM VOLTS, to correct voltage position.
k) Put a wire jumper on TB1, 4-5 to take the place of a run contact (to switch out of
field economy).
l) Other pots and jumpers not critical for the initial startup.
On the drive or Armature voltage control:
m) Place in “Armature Feedback” mode.
n) TACH VOLTS jumper to 7 volts/1000RPM on the armature control.
o) Temporarily adjust ACCEL and DECEL times of armature control to 15 to 20
seconds.
NOTE: “Field Weakening” is a way to extend DC motor RPM above base speed. If the
base field current and weakened field current are known (from the motor data) go to step
10. If the weakened field current is not known go to step 4.
4) Power up the field supply with the armature supply off.
5) Adjust P4, MAX FIELD CURRENT, to get the base field current (from the
nameplate). Raise P3, MIN FIELD CURRENT, if P4 will not go to that level.
NOTE: Omit steps 6 and 9 if the armature control has no 7v/1000 RPM input or if it can
easily, directly scale the extended speed tachometer voltage.
6) Adjust the TACH OFFSET, pot P2, so there is 0.0 volts on the TACH OUT position
TB1, 9-10)
7) Power up the armature supply and adjust to motor maximum rated armature voltage
which should run the motor at base speed. Check the motor speed with a tachometer.
8) Reduce the field current with P4 (MAX FIELD CURRENT) to achieve the desired
extended speed. The field current now flowing is the weakened field current. Note this
current level.