Honeywell UDC2800 User Manual

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Procedure #6
This table explains how to troubleshoot Position Proportional Output
failure symptoms.
Table 8-10: Troubleshooting Position Proportional Output Failure
Step What to do How to do it
1 Make certain that
the controller is
configured for
Position
Proportional
output.
Make Output Set Up group function prompt Output
Algorithms = Position Proportion.
See Output Set Up Group for more information.
2 Check the field
wiring.
See Installation for more information.
3 Check the output. Put the controller into Manual mode and change the
output from 0 % to 100%.
4 Check whether
the motor drives
in both
directions. If it
does go to Step 6.
See Position Proportional and Three Position Step Output
Calibration for more information.
5 Check whether
the motor drives
in either
direction. If the
motor drives only
in one direction,
check the
slidewire. If the
motor does not
drive in either
direction, check
the motor.
Refer to the motor instructions.
6 Check the output
voltage to the
slidewire (if used).
See the Input 2 wiring diagram for terminal designations in
Section – Installation.
1) Measure between the R and the – terminals (across the
entire slidewire). This voltage should be between 0.024
volts (for a 100 ohm slidewire) and 0.200 volts (for a 1000
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