8
8
Fuse Replacement:
The fuse incorporated into the Wireless Communication
Interface SMU PCBs is not intended for operator replace-
ment. A qualified technician can replace the applicable
fuse according to the following specifications. If neces-
sary, consult the factory for additional technical assistance
or for return of the Wireless Communication Interface.
115VAC
F1: 5x20mm, 0.125A Time Lag (Slo-Blo), 250VAC
LittelFuse #218.125
Bussmann #GDC-125mA
230VAC
F1: 5x20mm, 0.063A Time Lag (Slo-Blo), 250VAC
LittelFuse #218.063
Bussmann #GDC-63mA
Preventive Maintenance:
The Wireless Communication Interface is virtually mainte-
nance free. In typical applications, once the apparatus is
properly setup, it will operate without any further attention.
The electronics are housed in a weatherproof enclosure.
In addition the PCBs are conformal coated with a silicone-
based material to further prevent electrical influence by
condensation. The electronics should periodically be
observed for any signs of contamination caused by
improper enclosure protection (i.e. insure cover is fully
engaged, and that wire entries are properly sealed.)
Cleaning Requirements:
In the event that the antenna is fouled by external con-
tamination, reliable communication of the RF wireless sig-
nal may be degraded. In these cases, clean antenna with
a soft damp towel.
M A I N T E N A N C E
Support Functions:
(See Figure 10)
1) RUN/TEST switch:
This slide switch determines mode
of operation:
RUN: For normal operation of the Wireless Communi-
cation Interface, set switch in this position.
TEST: Use this selection for testing the radio link
between Wireless Communication Interfaces. Testing
can be conducted with or without connection of the
actual control system (
Silo
Track
) or sensors (SMUs).
At the Wireless Communication Interface on the control
system (
Silo
Track
) side of the “wireless link”, set the
switch to “TEST”. At the Wireless Communication
Interface on the sensor (SMU) side of the “wireless
link”, leave switch in RUN position. This will force the
control side radio module to emit a test signal to the
radio. When the sensor side radio receives the signal,
it will reply back to the control side with a confirming
test signal. The visual effect of a good link is when both
units indicate a QUERY blink, followed immediately by
a REPLY blink. This will cycle about every 0.5 sec-
onds. If the REPLY does not blink, then wireless link is
bad. The error light will flash briefly if a test signal is
received, but does not have a proper check sum, thus
indicating that the content and integrity of the signal is
suspect. (
Note: for a valid check of the radio link, only
one Wireless Communication Interface on the sensor
side of the “wireless link” (with same radio channel
selection
)
can be active/powered during testing. Apply
power only to the sensor side Wireless Communication
lnterface that you wish to test.
)
2) RESET switch:
This push button switch will induce the
Wireless Communication Interface to re-initialize the
entire system's operational software.
Figure 10
Figure 11
