SECTION 4
SYSTEM CHECKOUT
4.1 CONTROLLER OPERATION
After securing the MICRO 84 controller using the two mounting screws and
ensuring proper external AC power connections are made, AC power can
be applied to the controller. When AC power is applied, the controller
POWER light illuminates indicating the power supply is fully operational.
The-RUN light does not illuminate unless the controller has been started
and the terminator plug is in the right-hand connector. The controller is
started initially using Supervisory Code 2 which is entered from the P370
Programming Panel.
The controller is started also when using the program pack to load a
program into the controller. If power is applied (power light on) and the
controller is not running, the second push of the program pack pushbutton
starts the controller. (See Section 8.) Also, if the controller was running
when power was removed, it will be running when power is once again
reapplied.
Once started, the processor’s memory is fully operational.
CAUTION
During the power up sequence, AC output modules may
cause the false triggering of certain loads for one-half cycle.
The loads that are most susceptable are:
Latching relays
Fast-acting solenoids
(Hydraulic/pneumatic valves)
Latching circuits
(Motor starter with seal contact)
Special circuit designs have been incorporated into the AC
output modules to minimize this false triggering. However,
applications using fast reacting or latching devices that
initiate mechanical action may be a hazard due to false
triggering.
4.1 .l Power-Up Sequence.
During the power up sequence, the processor logic executes a program of
diagnostic tests to ensure that all system hardware is functioning properly.
If an error is detected during the power-up sequ.ence, the system halts. If
the P370 Programmer is connected, an error code is displayed on the panel.
If the programmer is not connected, no external indication of the error is
available but the error code is stored in a location in the controller memory.
When the P370 Programmer is reconnected to the controller, the error code
that has been stored will be displayed on the panel.
If all tests pass, the following sequence occurs:
1.
All coils are set OFF with the exception of latched coils and coils
which were disabled when power was last removed. These coils retain
their latched or disabled state.
4-1
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