·
122
·
Operation Instruction of S900 E Series Inverter
·
123
·
Chapter 8 Precautions for Maintenance and Inspection
(6) Speed does not increase
Causes and corrective actions:
a: Check that the maximum frequency (P105)setting is correct. (If
you want to run the motor at 120Hz or more, set P105 High speed
maximum frequency.)
b: Check that the load is not too heavy. (In agitators, etc, load may
become heavier in winter.)
c: Check that the brake resistor is not connected to terminals P/+-
-P/- accidentally.
(7) Inverter may interfere with other devices.
Causes and corrective actions:
The input/output (main circuit) of the inverter includes high
frequency components, which may interfere with the communication
devices used near the inverter. In this case ,set EMC filter valid to
minimize interference.
a: Decrease carrier frequency (P115).
b: Install a noise filter on the inverter output side to reduce the
electromagnetic nois generated from the inverter.
c: Install a noise filter on the inverter input side.
d: For reduction of induction noise from the power line of the
inverter,it is recommended to wire the earth cable by returning it to
the earth terminal of the inverter.
e: To prevent a malfunction due to noise, keep the signal cables
more than 10cm away from the power cables.
f: Control circuit cable should use shielded cable, and the cable
should be installed in metal tube
8-4 Inverter-generated noises and their reduction
techniques
Some noises enter the inverter to malfunction it and others are
radiated by the inverter to malfunction peripheral devices. Though
the inverter is designed to be insusceptible to noises, it handles