Electrical
Troubleshooting Guide
IRB6400 M94A
Page 9 - 12
Motor & Resolver Circuitry
9.5 Resolver
The Resolver is a part of the motor. The resolver is
made of coils and operates like a variable transformer.
The picture below demonstrates the parts of a resolver.
The primary or source of the resolver is known as the
exciter. The exciter voltage is 14 Vp-p at 4kHz. The
exciter voltage is induced to a pickup coil on the rotor
and then fed to the precision coils of the resolver. The
voltage on the precision coils is induced across to the
feedback coils known as the 'X' and 'Y' feedback coils.
The voltage amplitude on the feedback coils depends
upon the position of the resolver rotor. By monitoring
the amplitude of the 'X' and 'Y' coils, the computer can
determine the rotational position of the resolvers rotor.
Troubleshooting of a resolver is done best by checking
the resistance through the coils. The best place to make
this check is on the SMB. The exciter coil resistance
should be approximately 20 ohms. The feedback coils
should be approximately 70 ohms. If resolver errors
persist, use an oscilloscope to ensure proper voltage
levels on the exciter and feedback coils. The total of the
two feedbacks should be approximately 7 Vp-p. Use
test points provided on the SMB to check voltages.
Replacement of a resolver is not recommended with
out replacement of the motor since they are factory
assembled.
Diagram 9-6 Resolver Coil Relationships
EXCITER
14 Vp-p
X
Y
ROTOR
X + Y = 7 VOLTS
Sheets 104-110............
Sheet 104, line 07.........
Fig. 9-3 ............
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
To Next Page
Loading...
