GE Industrial Solutions DV-300 DC Quick Start - Manual (Page 11)

DV-300 Adjustable Speed Drives
—————— Quick Start up guide ——————
QS
11
3e. field current calibration dipswitch S14
The DV-300 regulation card is shipped with the field current feedback resistor dipswitches calibrated for the
maximum rating of the field package capacity for each size DV-300.This maximum field package rating is
incorporated in the DV- 300 catalog number.
For example: 6KDV3017Q4F10D1 The 10 represents a 10 A field exciter.
Compare the actual motor field data, recorded in step 3d., to the maximum rating of the field package
of the DV-300 model supplied (in the instruction book) , and to the field calibration dipswitch S14, as shown
below Table 3e1, 3e2, 3e3.
· For fixed field current operation, if the actual motor (base) field current = 10% of the maximum rating of the
field package it is required to calibrate the field current feedback scaling using dipswitch S14.
· For weak field operation, also referred to CEMF field control or crossover field control, if the actual top
speed motor field current = 10% of the maximum rating of the field package it is required to calibrate the
field current feedback scaling using dipswitch S14.
Calibration to the exact field current setting is not required, as long as the above conditions are met.
Calibration is not required if the field control is provided from a source other than the DV-300.
Example:
For the nameplate below, base speed is 1750 rpm @ 2.9 amps field and top speed is 2300 rpm @ 2.1 amp field.
The motor is desired to run at 2300 rpm, so the minimum field is 1 amp.
Typical DC Motor Nameplate
HP (kW) 20 RPM 1750 / 3000 Volts 500
Arm Amps 32
Fld Amps
2.9 / .9 Fld ohms 25 C 72
For DV-300, 6KDV3035..., the field package is rated for 10 A. The motor is needed to run at 3000 rpm, so
requires a minimum field setting of .9 amps. .9 A is less than 10% of the 10 A default dipwitch setting therefore
it needs changed.
A good setting for field curr scaling is 3.0 amps, S14-5 = ON, all others = Off.
The parameter [field curr scaling] also needs set for 3.0 amps.
RECORD REQUIRED S14 DIPSWITCH SETTING and FIELD SCALING AMPS
from the tables on the next page
Field curr scale S14 -1 S14 -2 S14-3 S14-4 S14-5 S14-6
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