Publication 2364F-5.05 - March 1999
3-6
Troubleshooting Faults and Warnings
6
P174 bit 6
M1 Open
M1 contactor opened while the RGU is in
ready or running state.
Clear the fault and try resetting/restarting the RGU. Check all
feedback wiring. Verify that the door-mounted start switch is turned
on. Check that timer relay (TR1) is set to 3 seconds. Check for any
other fault activity that may be causing the M1 Open fault.
7
P174 bit 7
SCANport Err
W
Error detected in SCANport controlling device
(or device missing).
Verify that the SCANport device is connected properly. Pull the plug
out and reconnect. If necessary, try resetting or restarting the RGU.
8
P174 bit 8
R2R HW Error
Error detected in the R2R hardware by the
CAN chip (which is responsible for R2R
communications).
Clear the fault and try resetting/restarting the RGU. Check the R2R
board(s) and wiring connections. Troubleshoot the board(s) and
replace as necessary.
9
P174 bit 9
Control Volt
W
The voltage supplied to the main control
board is too low for reliable operation.
The boards receive power from the DC bus. Check the wiring from
the gate driver board (J10) to the DC bus. Check the ribbon cable
connection between the gate driver board (J1) and the main control
board (J3). Check the TE connection on main control board (J11)
and the gate driver board (TB7-2). Troubleshoot the gate driver
board and main control board and replace as necessary.
10
P174 bit 10
H/S Overtemp
The heatsink temperature has exceeded the
prescribed temperature limit (100ºC for J-L
codes, 110ºC for M and N-codes).
Check that the door fans are operating properly, and verify that the
RGU is operating at the appropriately derated current (see the
specifications appendix in 2364F-5.01). Verify that the RGU is not
operating in overload for an extended period of time. Check internal
wiring and components for heat damage (melted wiring or burn
marks).
11
P174 bit 11
Bus Low
W
The DC bus voltage is under the DC Bus Low
Setting (P28, default 71% of nominal).
Verify the parameter setup. Check the Frame Catalog Number (P4),
the Scaled Bus Feedback (P143), the Bus Voltage Feedback
Calibration (P144), and the DC Bus Low Setting (P28). Check the
bus for shorts to ground (PE).
12
P174 bit 12
Bus High
W
The DC bus voltage has exceeded the DC Bus
High Setting (P29, default 114% of nominal).
Verify the parameter setup. Check the Frame Catalog Number (P4),
the Scaled Bus Feedback (P143), the Bus Voltage Feedback
Calibration (P144), and the DC Bus High Setting (P29).
13
P174 bit 13
BRAM Chksum
W
The checksum of data in battery-backed
RAM was bad. The data is deemed as
unreliable.
Try restarting the RGU, verify that all connections to the main control
board are in place, and check the main control board for any obvious
damage or any debris which may be shorting circuitry. If necessary,
try reinstalling the firmware (or upgrade to the latest available
firmware). Replace the board and/or send the board in for repair if
the problem cannot be resolved.
14
P174 bit 14
Prchrg Fail
The DC bus voltage was high enough to
power the control boards (200V DC), but did
not rise to the RMS value of the AC line to
allow the main contactor (M1) to close.
There may be too many inverters attached to the DC bus (the
precharge routine can only accommodate a certain amount of
external capacitance). If necessary, disconnect some of the
inverters until the RGU has completed its precharge, or contact
Rockwell Automation for other solutions. Check the precharge
resistors, the precharge fuses, and the precharge contactor (M2).
Also, check for shorts between the DC bus and ground (PE).
15
P174 bit 15
DSP Timeout
The host processor did not receive data from
the DSP. The host assumes that the DSP is
not running.
Try restarting the RGU, verify that all connections to the main control
board are in place, and check the main control board for any obvious
damage or any debris which may be shorting circuitry. If necessary,
try reinstalling the firmware (or upgrade to the latest available
firmware). Replace the board and/or send the board in for repair if
the problem cannot be resolved.
16
P177 bit 0
Desaturizatn
A power module was overloaded so severely
that the power module was forced out of full
‘turn on’ condition.
Check the power modules as indicated in chapter 4. Check the line
fuses and DC bus fuse (if equipped). If the components are good,
clear the fault and reset/restart the RGU.
Number Fault
Indicates
Action
