Owner’s Manual 27
Wanco® Metro™ Message Sign
5.2.5 Voltage alarm
A voltage alarm results when the battery voltage is out of range.
The sign measures voltage and current from the battery and the solar charging circuit.
You can use the controller to view the power values listed in Table 5-2.
The out-of-range warning limit for Vs is configurable using the controller.
If a voltage alarm occurs:
1. Follow the safety requirements in Section 2, page 3.
2. Check battery voltage (see “Charging” on page 42).
3. If the voltage is low, charge the batteries. The alarm shuts off when battery voltage
increases to 11.9Vdc, but the batteries should be charged to 12.65Vdc.
4. If the batteries do not need charging, check the battery cables and their connections to
the batteries. Replace damaged cables and repair bad connections.
5. If the batteries are charged and the cables and cable connections are good, then the
alarm may be a result of a power board failure. Contact the factory (see Section 1.4,
“Where to obtain service,” page 2).
5.2.6 Temperature alarm
A temperature warning alarm results when either of these conditions occurs:
■ One or more detected temperatures are out of range.
■ The temperature inside the display cabinet is critically high.
The sign has several sensors that measure temperature. You can use the controller to
view the temperatures listed in Table 5-3.
Out-of-range warning limits for Ts and Tc are configurable using the controller.
If a temperature alarm occurs, use the following information to troubleshoot the alarm.
Table 5-2. Power values
Code Description
Vs Sign voltage (battery), in volts
Is Sign current (battery), in amperes
Vl Line voltage (solar charger), in volts
Il Line current (solar charger), in amperes
Table 5-3. Temperature values
Code Description
Ts Temperature inside sign display cabinet (ambient plus solar heat)
Tc Temperature inside sign computer box
Ta Temperature of ambient sensor
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