Instruction manual
10
Start-up Procedure
FR1000 and FR3500 Field Supply start up procedure
The FR1000-000, FR3500-000 Field Regulator Unit has three programmable modes of
operation. Two of the modes use field current reduction to increase motor speed, which
also results in reduced output torque from the motor.
1) FIXED SUPPLY: where base speed or speed at highest rated armature voltage and
field current is the highest speed required and an accurate field current is needed over
the temperature range of the motor.
2) VARIABLE SUPPLY: where it is desired to extend speed by weakening the field but
with manual or dancer pot control of the field.
3) EXTENDED SPEED, WEAKENED FIELD OPERATION (OR CROSSOVER
OPERATION): This mode allows higher than base speed operation (with constant
horsepower above base speed). The tachometer feedback is required to keep motor
speed linear with respect to the speed reference.
QUICK START - FIXED SUPPLY
(REFER TO FIG 3 page 22)
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 to MAN position
b) P4, MAX FIELD CURRENT, full CCW
c) P3, MIN FIELD CURRENT, full CCW
d) J1, CURRENT RANGE, (on Power Board) position near base field current
e) Connect a wire jumper on TB1, 2-3
f) Connect a wire jumper on TB1, 4-5 to take the place of a contact for run (to
switch out of field economy)
g) Other pots and jumpers not critical for initial startup
On the drive or Armature voltage control:
h) Place in âArmature Feedbackâ mode.
4) Power up the Field supply with the Armature supply off.
5) Press SW1, MIN FIELD SET, and adjust P3 to approximately 50% of desired field
current. Release SW1 and adjust P4 to get rated maximum field current (on motor
nameplate).
5