Field circuit, Table 2.4.3.2: field current resistors – GE Industrial Solutions DV-300 DC Drive Users Manual User Manual
Page 31
DV-300 Adjustable Speed Drives
——— DESCRIPTION, COMPONENT IDENTIFICATION AND SPECIFICATIONS ———
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11
Field circuit
The DV-300 regulation card is shipped with the field current feedback resistor dipswitches S14 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 6KD-
V3017Q4F10D1 the “10” represents a 10A field exicer.
Compare the actual motor field data to the maximum rating of the field package of the DV-300 model supplied
(see table 2.4.3.1), and to the field calibration dipswitch S14, as noted below.
- 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 as “CEMF field control” or “crossover field control”, if the top base
speed Motor nom flux ≤ 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 by a separate field converter.
Setting all dip switches to OFF allows a custom calculated resistor to be used in terminals LA and LB using the
following formula for model numbers 3017 to 3850, 3020 to 310H :
Resistance = 1667 / field current amps.
For model numbers 30900 to 33300 the formula is in Appendix A (GEI-100332C).
Table 2.4.3.2: Field current resistors
Switch ohms
168.5 ohm 333.3 ohm 182 ohm 36.4 ohm 845 ohm 1668 ohm
Equivalent
resistance
Nom flux curr
S14-1
S14-2
S14-3
S14-4
S14-5
S14-6
S14-7
S14-8
1.0 A
OFF
OFF
OFF
OFF
OFF
ON
Not used
1688 ohm
2.0 A
OFF
OFF
OFF
OFF
ON
OFF
845 ohm
3.0 A
OFF
OFF
OFF
OFF
ON
ON
560.9 ohm
5.0 A
OFF
ON
OFF
OFF
OFF
OFF
333.3 ohm
9.9 A
ON
OFF
OFF
OFF
OFF
OFF
168.5 ohm
12.9 A
ON
OFF
OFF
OFF
ON
ON
129.6 ohm
14.2 A
OFF
ON
ON
OFF
OFF
OFF
117.7 ohm
17.1 A
OFF
ON
ON
OFF
ON
ON
97.3 ohm
20.0 A
ON
OFF
ON
OFF
OFF
ON
83.1 ohm
24.1 A
ON
ON
ON
OFF
OFF
OFF
69.3 ohm
25.1 A
ON
ON
ON
OFF
OFF
ON
66.5 ohm
DV0032g