7:4
2.
Turn power OFF.
DANGER
THIS EQUIPMENT IS AT LINE
VOLTAGE WHEN A-C POW-
ER IS CONNECTED TO THE
CONTROLLER. WHENEVER
POWER IS REMOVED,
VERIFY WITH A VOLTMETER
AT FACEPLATE TERMINAL
147(+) AND TERMINAL
145(–) THAT THE D-C BUS
CAPACITORS ARE DIS-
CHARGED BEFORE TOUCH-
ING ANY INTERNAL PARTS
OF THE CONTROLLER.
FAILURE TO OBSERVE THIS
PRECAUTION COULD RE-
SULT IN SEVERE BODILY
INJURY OR LOSS OF LIFE.
3.
With power OFF, make a
complete physical inspection
of all control and motor wiring
for correct and tight
connections. Be sure that
connectors on the controller
are correctly positioned and
tight.
4.
Unscrew control fuse 4FU on
the faceplate of the controller.
If the fuse is blown, replace
with Reliance part number
64676-23K; Bussmann Type
MDQ, 3/10 A, 250 V; or
equivalent.
5.
Verify that the input power
voltage corresponds with the
voltage selected within the
controller (factory set for 230
VAC) and is in the tolerances
range. If not, reconnect the
RED lead connection and/or
add a transformer between
the plant power supply and
the controller.
6.
Make sure the controller
ground terminals on the
faceplate and the motor frame
are connected to earth
ground.
7.
Check for and correct poor
wiring conditions:
•
Input and output leads
routed through the same
conduit.
•
Input or output leads
running parallel or in the
same conduit with control
signal wiring.
•
Control signal wire that is
not twisted or shielded.
8.
Make sure that all nearby
relays, solenoids, or brake
coils are suppressed.
9.
Check that the ambient
temperature does not exceed
0C to 55C(32F to 131F) for
chassis controllers or 0C to
40C(32F to 104F) for
enclosed controllers.
10. Check that all pots, dip
switches, and jumpers are in
the correct position for the
application.
11. Check that external
sequencing logic is wired
properly to the controller
through connector 2CN.
12. If satisfactory operation still
cannot be obtained, proceed
to the “Identify Fault Symptom
and Correct Using Flow
Charts.”
Identify Fault
Symptoms and
Correct Using Flow
Charts
1.
Determine the operating
condition under which the fault
occurred.
2.
Identify the fault symptom
from the following list:
Figure 7-1. Motor will not run,
which includes the following
symptoms:
•
Controller will not start.
•
Control fuse 4FU is blown.
•
IET trip occurs when the
controller is started.
Figure 7-2. Motor runs at
uncontrolled speed, which
includes the following
symptoms.
•
Controller starts but motor
stays at low speed.
•
Controller IET occurs during
acceleration.
Figure 7-3. Motor rotation is
unstable.
Figure 7-4. Acceleration/
Deceleration is not smooth.
Figure 7-5. Heavy vibration
results when motor stops.
3.
Turn to the flow chart figure
number listed in front of the
selected symptom.
4.
Proceed through the selected
flow chart.
5.
Proceed through the “Check
the Power Unit” in this chapter.
6.
Refer to the wiring diagram
(Figure 7-9) as necessary.
7.
Output speed and load can be
monitored on the 2CN
connector (See Figure 3-5) as
indicated below:
SPEED: 0 to +5.5 V output with
4.8 V nominal
unloaded output when
the 1750 RPM, 2500
PPR motor is
operating at base
speed.
LOAD:
0 to +8.0 V output
where 8 V nominal
unloaded is 200% of
the controller rating.
8.
Refer to Table 7-4 for
replacement parts data.
9.
If satisfactory operation
cannot be obtained, contact
your Reliance Electric Sales
Office for service coordination.
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