Honeywell UDC2800 User Manual

Lower Display Reason for Failure How to Correct the Problem
to burn out. This error message
may also be created if the
resistance of the wires used to
connect the thermocouple to the
instrument is above 100 ohms.
TC 2 Warning Thermocouple on Input 2 is
starting to burn out.
This diagnostic message means
that the controller has detected
that the thermocouple is starting
to burn out. This error message
may also be created if the
resistance of the wires used to
connect the thermocouple to the
instrument is above 100 ohms.
TC 1 Fail Thermocouple on Input 1 is in
imminent danger of burning
out.
This diagnostic message means
that the controller has detected
that the thermocouple will soon
fail. User should consider replacing
the thermocouple as soon as
possible. This message will also be
generated if the resistance of the
wires used to connect the
thermocouple to the instrument is
above 180 ohms.
TC 2 Fail Thermocouple on Input 2 is in
imminent danger of burning
out.
This diagnostic message means
that the controller has detected
that the thermocouple will soon
fail. User should consider replacing
the thermocouple as soon as
possible. This message will also be
generated if the resistance of the
wires used to connect the
thermocouple to the instrument is
above 180 ohms.
Output 1 Fail Current Output is configured as
4-20mA, and Current Output is
less than 3.5 mA
The current output is open circuit.
Check the field wiring. See
Procedure #2.
Output 2 Fail Auxiliary Output is configured
as 4-20mA, and Auxiliary
Output is less than 3.5 mA.
The auxiliary output is open circuit.
Check the field wiring. See
Procedure #9.
262
Chapter 8 - Troubleshooting/Service

Honeywell UDC2800 Specifications

General

Control Modes	PID, ON/OFF, Manual
Mounting	Panel Mount
Display	Dual 4-digit LED
Input Types	Thermocouple, RTD, mA, mV, V
Output Types	Relay
Power Supply	100-240 VAC, 50/60 Hz
Communication	RS-485 Modbus RTU
Enclosure Rating	NEMA 4X