2-25
D Installing a Thermal Relay
This Inverter has an electronic thermal protection function to protect the motor from overheating. If,
however,
more than one motor is operated with one Inverter or multi-polar motor is used, always install a
thermal relay (THR) between the Inverter and the motor and set n033 to 0 (no thermal protection).
In
this case, program the sequence so that the magnetic contactor on the input side
of the main circuit is
turned off by the contact of the thermal relay.
D Installing a Noise Filter on Output Side
Connect a noise filter to the output side of the Inverter to reduce radio noise and induction noise.
Noise
filter
Power
supply
Signal line
Controller
Induction
noise
Radio noise
AM radio
3G3HV
Induction Noise: Electromagnetic
induction generates noise
on the signal line, causing the controller
to malfunction.
Radio Noise: Electromagnetic waves from the Inverter and cables cause the broadcasting radio
receiver to make noise.
D Countermeasures Against Induction Noise
As
described previously
, a noise filter
can be used to prevent induction noise from being generated on
the
output side. Alternatively
, cables can be routed through a grounded metal pipe to prevent induction
noise.
Keeping the metal pipe at least 30 cm away from the signal line considerably reduces induction
noise.
Controller
30 cm min.
Signal line
Power
supply
Metal pipe
3G3HV
Installation Chapter 2
To Next Page
Loading...
Need help?
General