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M a i n t e n a n c e a n d T r o u b l e s h o o t i n g
C. Maintenance and Troubleshooting
Blown Fuse
The TCU800 includes one 2A replaceable fuse. The fuse is located on the side of the TCU and is labled F601. The fuse is
designed to protect the TCU’s DC power circuitry from its operating AC input voltage.
If this fuse blows, you will see one of the following responses depending on the status of the TCU’s backup battery:
Functioning DC Battery
TCU triggers a local AC Power alarm and reports an AC Power Fault to the central
SCADA system. TCU indicators, such as LED lights and LCD screen, will be normal.
DC Battery Dead or Below
Tolerance
No local AC Power alarm is generated; No AC Power Fault is reported to the central
SCADA system. TCU indicators, such as LED lights and LCD screen, will be off. The
TCU station will eventually be shown as Offline in HT3.
Conditions that could cause the fuse to blow:
• Incorrect operating voltage
• Surge in operating AC power voltage greater than .375 A
• Heat condition that exceeds designed operating temperature of 160 degrees
• Incorrect control voltage wiring
• Shorted circuit within the TCU
Before replacing the fuse:
• Inspect the TCU site and wiring to see if any of the conditions listed above may have occurred.
• If you received an offline alarm for this station, check the battery to verify it is functioning properly. Replace the
battery if you find it is unable to hold a charge.
• Measure the input voltage and check the wiring to the TCU’s connector. The operating voltage is marked on the
connector label. Try replacing the fuse only when the proper voltage is connected.
Replacing the fuse:
Replace the fuse with a new identical one.
After replacing the fuse, verify that the TCU is functioning properly (LED lights are lit; LCD screen is working).
If the TCU isn’t working after you’ve replaced the fuse, the TCU may require Factory service. See “Appendix O: Support,
Service, and Warranty” for removal, replacement, and servicing instructions.
TCU Replacement
The TCU can easily be removed and replaced with a backup TCU if it is determined that the TCU needs servicing.
Summary of Contents for TCU800
Page 1: ...Installation and Operation Manual T C U 8 0 0 Data Flow Systems Inc P r e l i m i n a r y ...
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Page 4: ...D a t a F l o w S y s t e m s I n c Intentionally left blank ...
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Page 56: ...46 C h a p t e r 5 Quick View Analog View Pump Statistics ...
Page 57: ...47 U s e r I n t e r f a c e Alarms Settings Screen 1 Settings Screen 2 ...
Page 58: ...48 C h a p t e r 5 Advanced Settings About ...
Page 77: ...67 O p e r a t i n g P r o c e d u r e s TCU Installed in Existing Control Panel ...
Page 87: ...77 M o d b u s S u p p o r t Figure 1 Figure 2 Figure 3 ...
Page 92: ...82 D a t a F l o w S y s t e m s I n c Appendix ...
Page 157: ...147 D a t a F l o w S y s t e m s I n c ...
Page 158: ...148 D a t a F l o w S y s t e m s I n c ...
Page 159: ...149 D a t a F l o w S y s t e m s I n c ...
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