Magnetek MHR, Руководство пользователя

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MHR Radio Controller Instruction Manual
June 2017
Page 18 of 58
Figure 08: MHR driving Current Compensated or PWM load using Return Pin and internal
diodes
NOTE: This is a simplified schematic.
Figure 09: MHR PWM or Digital ON/OFF load using external ground and external diodes
NOTE: This is a simplified schematic.
PWM and digital outputs are not required to make use of the return pin. However, if the return pin
is utilized, use of an external diode is not needed for inductive loads.
NOTE: When the return pin is not utilized for PWM or digital outputs, a clamping diode must be
placed between the source and the output to provide protection against voltage transients. The
clamping diode should be placed as close to the load as possible. Magnetek recommends the
use of Magnetek P/N 14-105-0021E (clamping diode, 3A/1000V) in this situation, but depending
on the load, other clamping diodes might be used instead.
When configured as frequency or digital inputs, the IOs have 20K Ohm input impedance. The
return pin is not used in conjunction with an input.