A heat exchanger comprises a shell formed from two joined-together shell members. In an exemplary configuration, a virtual disk file can be associated with a log that acts as both a log and a check point record. The assembly of electric motor with encoder further includes an output signal cable connected to the circuit board of the encoder and including a signal wire and a shield member, and a grounding mechanism electrically connecting the shield member of the output signal cable to the motor housing for grounding purposes.