– 45 –
– 44 –
Motor won't run
Wiring is correct
Prospect of speed controller failure
External noise
Motor with thermal protector
No
Proper load factor
Motor or capacitor fails
Motor is running at constant speed
Wiring is correct
Speed controller is at fault
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Yes
Yes
No
Yes
· Halt the process for recovery
· Reduce the load or use a
higher output motor
· Arrange setting so that the
motor frame temperature is
kept below 90
°
C
Protect against noise
Noise filter
· MR-2043: NEC Tokin Corp.
· SUP-EQ5-ER-6 (DV0P3611-5):
Okaya Electric Industries Co., Ltd.
SUP-EQ5-ER-6 is a recommended
noise filter for use in high noise level
environment.
Voltage across pin 1 and 7
changes as the speed setting is
changed
Review wiring against the wiring
diagram (see pp.17–27)
Review wiring against the
wiring diagram (see pp.17–27)
· Tachometer generator is
faulty
· Breaking of interconnecting
cable
Reduce the load or use a higher
output motor
Using jumper wire, short-circuit pins 2 and 7.
AC voltage (approx. 6.5 V) on pins 4 and 5
Thermal protector is active
· Thermal protector actuation
temperature:120–130
°
C
Troubleshooting
If a problem occurs with your system, use the following procedure for
locating and remove the cause.
In the event the problem cannot be isolated or the speed controller
is suspected, or if you have any questions, please contact us or your
local agency.
9. Inspection and maintenance
Inspection
Periodically check and maintenance to assure safe and reliable
operation of the speed controller.
Practical considerations for checking and maintenance
Turning off/on of power supply must be done by the personnel
responsible for the maintenance work.
hecking items and period of maintenance work
Under normal operating condition
Ambient temperature (annual average) 30 °C,
100 % load factor, 20 hours max./day
Perform daily check and periodic check as shown below:
Category
Check for
Frequency
Daily check
Periodic check
Every day
Once/year
• Ambient temperature, humidity, dust, dirt, foreign material
• Unusual vibration, shock, sound • Main circuit voltage
• Smell • Contaminated pin
• Damaged wiring • Loose connection (motor, devices)
• Misalignment • Foreign matters on load
• Excessively overheating motor
<Precautions>
The frequency specified for periodic check should be changed as necessary
depending on operating condition.
Guideline for replacement
No reference can be established since components and parts should
be replaced based on operating condition and method. Replace or
repair defective or malfunctioning parts.
DON'T
Consult us when it is necessary to
overhaul the assembly.
Product
Speed
controller
Category
Electrolytic
capacitor
Life expectancy
Remarks
Approx.
5 years
Motor, gear See motor instruction manual.
Life expectancy is reference for replacement.
Potentially defective part must be replaced
before expected lifetime.
