EC&M AC Crane Control
FRONTLINE ® AC CRANE CONTROL
CLASS
August, 2012
RESISTOR SELECTION FOR AC CRANE CONTROL SYSTEMS A set of TABWELD ® resistors are required for each AC motion control system. The following table is for selecting resistors for all AC motor crane control applications. RESISTOR APPLICATION
CLASS 6715 TYPE TW RESISTOR
For resistors mounted in racks, unwired – refer to Class 6715. Class 151 and 152 is recommended for light crane duty. Class 161 and 162 is recommended for standard duty. Class 171 and172 is recommended for severe duty. For explanation of NEMA resistor classifications – refer to Class 6715 catalog
CLASS 6715 RESISTORS TYPE NUMBER SELECTOR*
Class 6715
A2 G 37K C 5
4 4 D 350V 67A
Controller Type Enclosure Motor Power
NEMA Class Speed Points System Voltage Motor Rated Voltage Motor Configuration Rotor Volts Rotor Amps
* This Type Number Selector provides a complete resistor set Type Number to allow part number creation. These Type Numbers are not part numbers. EXAMPLE: ABOVE AC RESISTOR SET The above Resistor Type Number Selector code describes a set of resistors for a duplex CONTRA -TORQUE hoist (2 motors in parallel), NEMA 161 rated duty cycle, 5 speed points, system & motor voltage applied at 460VAC, 37kW, enclosed in NEMA 1 style rack(s), with rated rotor voltage of 350V and rated rotor current of 67A. CLASS 6715 RESISTOR TYPE NUMBER SELECTOR CODES
Speed Points No.
Motor Rated Voltage
Motor Rating
System Voltage
Motor Configuration
Controller Class
Enclosure
NEMA DUTY
Rotor
Rotor
Control Scheme
Code
Type
Code Code
Class
Code Code
V Code V Code
Type
Code
A0 A1 A2 A6
A B C D E F G H
6420 6421 6422 6426
151 152 161 162 171 172
N
3
None
2
2
208
208
“#H” (HP)
S
Simplex
O
4
Open
3
3
380
380
Amps
Volts
A7
G
5
6435 Hoist
NEMA 1
D
Duplex
91 92
“#K” (kw)
A8
W
4
4
6
6435 Travel
NEMA 3R
460
460
Q
Quadruplex
Customer Design
NEMA 1 w/ Screen Covers
A99
C
CS
7
5
5
Customer Design
575
575
20
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