GEH-5304A
14
Table 4
Power Supply Available
ACDEK
A√****
C√√***
D√√√**
E√√√√*
NP Rating Code
K√√√√√
√ Com patible power supply.
* Ex ternal induct anc e may be nec essary to li mit rippl e c ur r ent.
C. Power Supply Identific ation
The nameplates of DC motors intended for operation from rectified power supplies will be stamped with a
power supply identification as described below.
1. When the test power supply used as the basis of rating is one of the five described below, a single
letter "A”, “C”, “D”, “E” or “K” will be used to identify the test power supply.
a. Power Supply Identific ation Letter “ A ”
This designates a DC generator, battery or an y power supply with enough series inductance to
result in n o mor e than 6% peak-to-peak armature current r ipple.
b. Power Supply Identific ation Letter “ C”
This designates a three-phase, 60 hertz input, full-wave power supply having six total (con-
trolled) pulses per cycle. The power supply has no free-wheeling and no series inductance.
The input line-to-line AC voltage to the rectifier shall be 230 volts for 240 volt DC motor rat-
ings, an d 460 volts for 500 or 550 volt DC motor ratings.
c. Power Supply Identific ation Letter “ D”
This designates a three-phase, 60 hertz input, semi-bridge power supply having three-
controlled pulses per cycle. The supply has fr ee wheeling with no series inductance added ex-
ternally to the motor armature circuit. The input line-to-line AC voltage to the rectifier shall be
230 volts for 240 volt DC motor ratings and 460 volts for 500 or 550 volt DC motor ratings.
d. Power Supply Identific ation Letter “ E ”
This designates a three-phase, single-way (half-wave) power supply having three total pulses
per cycle an d thr ee-con trolled pulses per cycle. Th e power supply has n o free wheelin g a nd n o
series inductance added externally to the motor armatur e circuit inductance. Th e in put lin e-to-
line AC voltage to the rectifier shall be 460 volts for 240 volt DC motor r atings.
e. Power Supply Identific ation Letter “ K ”
This design ates a single-ph ase, full-wave power supply h aving two total (contr olled) pulses per
cycle with free wheeling 60 hertz input and no series inductance added externally to the motor
armatur e circuit. The input AC voltage to the rectifier shall be 230 volts for 180 volt DC rat-
ings.