DC Motors
5
For example, a motor designed for a D type of power supply may be used
on a C power supply having the same voltage rating. The types of power
supplies are defined as follows.
1
When the armature power supply cannot be designated by a single letter code (A. K etc.) the power supply shall
be identified by the following code stamped on the motor nameplate: “M/N F-V-H-L.”
where M = Total pulses per cycle
N = Total controlled pulses per cycle
F = Free wheeling (if used)
V = Nominal line-to-line a-c voltage to rectifier
H = Line frequency-Hz
L = Value of series inductance (in millihenries) to be added externally to the motor armature circuit.
Examples:
A. "6/3 F-380-50-12" defines a power supply having 6 total pulses per cycle, 3 controlled pulses per cycle
(S-3), with free wheeling, 380 volts. 50 Hz AC input to bridge, and a 12 millihenry choke to be added
externally to the motor armature circuit.
B. "3/3 480" defines a power supply having three total pulses per cycle, three control pulses per cycle. 480
volts line-to-line input to the rectifier. 60 Hz power supply and no external inductance required in the
armature circuit. Note that since the power source is 60 Hz and no series inductance is required. both
quantities may be omitted from the code. If one of the quantities is indicated, both must be included to
avoid confusion.
Conduit Box
Conduit boxes can be rotated in 90 degree increments for lead outlet at top,
sides or bottom.
Conduit box locations can be changed from F1 to F2 or F2 to F1 by rotating
the commutator end bracket 180 degrees and reconnecting the leads. The
conduit box location cannot be changed on DC180ATZ & DC210ATZ
frames.
Connections
Important:
If motor has parallel leads, all lugs with the same marking: For
example, A1, A1, must be connected together.
Figure 1 Basic DC Motor and Generator Connections
If machine has no series field, disregard S1 and S2 above. For machines
with special windings, refer to motor or generator and controller diagrams.
Description
Code
1
DC generator, battery or twelve pulse/cycle, 6 phase, full control
A
Six pulse cycle, 3 phase, full control 230 or 460 volt, 60 Hz input to rectifier
C
Three pulse/cycle, 3 phase, semi-bridge, half control 230 or 460 volt, 60 Hz input to rectifier D
Three pulse/cycle, 3 phase, half-wave (single way) 460 volt, 60 Hz input to rectifier
E
Two pulse/cycle, 1 phase full wave (bridge circuit with 2 controlled rectifiers and
2-uncontrolled rectifiers with free wheeling rectifier) 230 volt, 60 Hz input
K
+A1
Motor
Type
CCW
Rotation Facing Commutator End
CW
A2
S1
–S2
+F1
–F2
A1
+A2
S1
–S2
+F1
–F2
A1
Generator
+A2
S1
–S2
–F1
+F2
A1
+A2
–S1
S2
+F1
–F2
