Manual

Troubleshooting
Chapter 7
73
Table 7.B
I/O RACK F AUL T and CBM F AUL T Indicators
I/O RACK
FAULT
CBM
FAULT
Problem Correction
On Off Intermittent electrical noise, faulty 1771PM
module, or shorted I/O chassis backplane
Cycle power
Replace 1771PM module
Replace each I/O module one at a time
Replace I/O chassis
On
or OFF On
Intermittent electrical noise or faulty 1771PM
module
Cycle power
Replace 1771PM module
Figure 7.2
T
roubleshooting Flowchart for Module Indicators
Press will not run.
Are all status indicators for
inputs to the 1771IA module
off? (See Figure 7.1)
Is the mode select switch off?
All power is off.
(See figure 6.1 or 6.5)
Yes
Yes
Select proper
mode.
Does the
press run?
Yes
Resume
normal
operation.
No No
Check the 1771PM module indicators. (See figure 7.1)
Are both ACTIVE indicators on?
Press should run. Refer to press
builder's documentation.
Yes
Is either ACTIVE indicator blinking?
Yes
Go to table 7.A
No
No
Is either I/O RACK FAULT indicator on?
No
Is either CBM FAULT indicator on?
Yes
Go to table 7.B
No
Replace the 1771PM module whose ACTIVE indicator is off, or check the chassis
power supply.
12290
No
Is a diagnostic
message displayed
Go to table 7.C.
Are rack addresses, rack
size [1], and/or baud rate
set correctly?
Yes
Yes
[ 1 ] The controller will not operate if you manually configure chassis A and B to a half rack
Warning: To guard against injury to personnel, open and lock the main power disconnect before adjusting, replacing, or repairing any
mechanical or electrical component in your press system. This consists of the press, clutchbrake, controller, and all associated wiring and
control panels.