Thiele Streamfeeder V-710DM, Manual

Page: 67 / 73

60 V
alue
S
erieS
V-710DM M
anual
Problem Solution
Table 9-1. Quick-Look Troubleshooting (continued)
Testing the sensor (contin-
ued)
Testing the control relay
Exercise care when perform-
ing the following test. Bodily
contact with 115VAC or
230VAC can result in serious
injury or death.
3. Measure for the presence of AC power at the L1 and Neutral (L2) terminal of the
motor drive board. If power is not present, first verify integrity of AC power leads from
the power entry module, and refer to section titled “Testing the power entry module.”
Correct the absence of AC before continuing. Is the green light on the sensor illumi-
nated?
a. Yes: Go to step 4.
b. No: Replace sensor assembly (1050-11-39).
4. Cover the sensor. The yellow LED should illuminate. Does the yellow LED illuminate?
a. Yes: Go to step 5.
b. No: Replace sensor assembly (1050-11-39).
5. When the sensor is uncovered, the light it emits does not reflect back into the sen -
sor’s receiver and is “dark”. The relay coil should de-energize when the sensor is
covered, and should energize when the sensor is uncovered. Therefore this sensor
works in the “dark-on” or “normally closed” mode. Does the relay coil alternately de-
energize and reenergize as the sensor is alternately covered and uncovered?
a. Yes: Sensor assembly is good.
b. No: Replace relay with a known good relay. See the section titled “Testing the
control relay,” 115V (535-00-453), 230 V (535-00-457). If relay coil still does not
alternately de-energize and re-energize as the sensor is alternately covered and
uncovered, replace sensor assembly (1050-11-39).
1. Remove relay 115V (535-00-453), or 230V (535-00-457) from the machine discon -
necting all leads from the relay terminals.
2. Measure the normally closed sets of contacts for continuity using an ohmmeter:
a. Measure between terminals 1 and 5, and terminals 2 and 6. Zero ohms mea -
sured indicates complete continuity. If more than a couple of ohms is measured,
replace relay.
3. Verify coil operation and test the normally open sets of contacts for continuity using
an ohmmeter:
a. Carefully apply the appropriate AC power to the coil terminals “A” and “B” on the
relay. If the contacts do not move, replace the relay.
b. While the coil is energized, measure between terminals 3 and 5, and terminals 4
and 6. Zero ohms measured indicates complete continuity. If more than a couple
of ohms is measured, replace relay.
4. If the contacts move when power is applied, and all contacts have continuity, the
relay is OK. If a known good relay’s contacts do not move when installed in the
machine verify all wiring is correct and the AC sensor is operational. Correct wiring or
replace sensor as necessary to return feeder to operation.