User Manual
Manual 505K_1.1
Page 15
value. The high setpoint percentage must always be greater than, or equal to, the low set
point.
The internal setpoint status will be determined every time an analogue measurement is taken.
The setpoint status is treated as a digital signal and its value is transmitted according to the
rules for a digital input.
2.4.7
Supply Voltage
The 505K measures the supply voltage and stores it as an internal “analogue” value. The
range of the analogue value is 0 – 30 volts. The measurement is made every time the radio
transmits (the measured value is the “loaded” supply voltage) and the measurement is
transmitted based on the user-configurable update time - there are no change transmissions
for this value.
2.4.8
Low Supply Voltage Alarm (Supply LowVolts)
If the voltage of the power supply falls below the pre-configured alarm value, the internal low
voltage alarm will turn on. The 505K provides user-configurable high and low setpoints for
the supply voltage value. If the supply voltage falls below the low SP, then the Supply Low
Volts status will turn on. When the supply voltage increases above the high SP, the status
will turn off. The low SP should not be set less than 5.7V.
The Supply Low Volts is treated as a digital signal and its value is transmitted according to
the rules for a digital input.
2.4.9
Supply Failure
The 505K will stop operating if the supply voltage falls below 95% of the Supply LOV value.
Prior to shutting down, the 505K will store the values of the pulse counters in non-volatile
memory. The unit will restart when the supply voltage has increased to the configured high
SP value.
2.4.10
Communications Failure
The 505K cannot provide an indication that its transmitted messages have not been received
successfully.
This indication is however available at the
receiving 105U
by using the 105U Output Reset
on Comms Fail function. To use this function, map an input that is not being used on the
505K to a spare output on the 105U. The unused input can be an internal input such as the
Low Voltage status or Setpoint status, or even the analogue input as this can also be mapped
to a digital output. Configure the 505K so that the digital output at the 105U is normally on -
you can configure an input to output mapping to be inverted or direct.
If you configure a reset time to the 105U output, then this output will turn off if it has not
received an update message from the 505K within that time. The 105U output is effectively a
"Communications OK" output - on when communications are OK, and off during
communications failure. Note that the maximum output reset time at the 105U is 32 minutes,
so the update time for the 505K input must be less than this. It is generally a good idea to set
the update time to less than half of the reset time. Then, the 105U must fail to receive two