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Chapter 11
Testing & Troubleshooting
Table 90 - Troubleshooting
Problem
The relay does not respond to commands from a device
connected to the serial port.
The relay does not respond to faults.
The relay trips on overload sooner than expected.
Possible Cause
Cable is not connected.
Cable is not the correct type.
The relay or device is at an incorrect baud rate or has
another parameter mismatch.
The relay serial port has received an XOFF, halting
communications.
The relay is improperly set.
Improper test source settings.
Current or voltage input wiring error.
Failed relay self-test.
The phase rotation is improperly set.
The FLA is improperly set.
The SF is improperly set.
Solution
Verify the cable connections.
Verify the cable pinout.
Verify Device software setup.
Type <Ctrl> Q to send the relay XON and restart
communications.
Verify the relay settings.
Verify the test source settings.
Verify input wiring.
Use the front panel 4'.#;56#675 function to view selftest results.
Verify phase rotation setting as described in Figure 48 or
Figure 49.
Verify FLA settings.
Verify the Service Factor of the motor.
Field Serviceability
ATTENTION: Disconnect or de-energize all external connections before opening this
device. Contact with hazardous voltages and currents inside this device can cause
electrical shock that can lead to injury or death.
Equipment components are sensitive to electrostatic discharge (ESD). Undetectable
permanent damage can result if you do not use proper ESD procedures. Ground yourself,
your work surface, and this equipment, before removing any cover from this equipment.
If your facility is not equipped to work with these components, contact Rockwell
Automation about returning this device and related Rockwell Automation equipment
for service.
The 825-P firmware can be upgraded in the field (refer to Chapter 13for
firmware upgrade instructions). By monitoring the front-panel messages, the user
will be aware of a self-test failure occurrence. By using the metering functions, the
user will be aware if the analog front-end (not monitored by relay self-test) is
functional.
The only two components that can be replaced in the field are (1) the power
supply fuse and (2) the real-time clock (RTC) battery.
Power Supply Fuse Replacement
To replace the power supply fuse, perform the following steps:
1. De-energize the relay.
2. Remove the eight rear panel screws, ground screw, and relay rear panel.
3. Remove the Slot A printed circuit board.
4. Locate the fuse on the board, then remove the fuse from the fuse holder.
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Rockwell Automation Publication 825-UM004D-EN-P - November 2012