E Sample And Hold; G 4-20 Ma Signal Generator - Kele UCM-420A Operating And Installation Instructions

Modes of Operation (Cont.)
E
Sample and Hold
The UCM-420A may be used to monitor and pass through a 4-20 mA or 1-5 VDC signal. If the signal being moni-
tored is lost, the UCM-420A will output the last valid value for the signal until the signal returns. On a power loss, the
signal is remembered up to six hours. When used in this mode the UCM-420A may be programmed to either
reverse the signal being monitored, or pass it through direct. See page 26 for instructions on operating the UCM-420A
in this mode.
F
Pulse-Width to 4-20 mA Converter (Single or Multiplexed)
In this mode the UCM-420A converts a time-based pulse-width AC or DC signal to a 4-20 mA output. By using the
multiplexed mode, multiple UCM-420As may be controlled by one BAS output. In this mode all setpoint and input
signals are ignored and the output signal is based on the pulse-width signal only. The output signal is retained up to
6 hours on a loss of power. Upon a power return, the saved value is output until a new pulse signal is received. The
output may be direct- or reverse-acting. See page 27 for instructions on operating the UCM-420A in this mode.
G
4-20 mA Signal Generator
If the device to be controlled by the UCM-420A needs to be calibrated before the system is started up, the UCM-420A
may be used to generate a 4-20 mA output signal in 1 mA steps. In this mode the UCM-420A ignores all input and
setpoint signals and outputs a signal from 4-20 mA when DIP switches are turned off or on as required. See Page
29 for instructions on operating the UCM-420A in this mode.
THIS CONCLUDES MODES OF OPERATION. THE FOLLOWING SET-
UP INSTRUCTIONS WILL GUIDE YOU THROUGH THE STEPS NEC-
ESSARY TO ACHIEVE THE MODE OF OPERATION YOU REQUIRE.
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