restore operation of the system, set the STOP switch on the controller to the ‘RUN’ position and cycle
power to the controller by setting the ON/OFF switch to ‘OFF’ and then ‘ON’.
8. Verify your engineered system’s options: Since MP96 systems are engineered to customer specified
options, there are many ways that the decoder’s microcomputer can be configured to operate. The plug-in
EPROMs determine how the unit will respond. Refer to the customized documentation package provided
with your system and locate the listed serial number of the EPROMs. Compare the listed serial number of
the EPROMs with the actual serial number on the EPROM itself. If the serial numbers match, the
documentation will identify the options used in the manufacture of the system.
9. Test the functionality of the Automatic Safety Override (ASO) circuits: A simplified test can be
performed to make sure the OPR1 and OPR2 relays drop out if an output relay energizes without an
operator command. The ASO circuits monitor the last stage of the remote control interface, that is, the
relays that control the motor direction contactors on the equipment. If one of these relays operates
without a command from the controller, the decoder is disabled in two stages. In Stage 1, the main relay
output for that motor is disabled, along with the matrix relay outputs for that motor. This is achieved by
removing the power feed from the electronics chassis to the relay outputs for that motor, which should
disable the motor on the machine. The system status display posts an error bulletin showing the failed
output, including the disabled main relay and matrix outputs. The remaining machine motors are still
enabled, allowing the operator to finish any critical operations, move the machine/load to a safe position
and troubleshoot the failure. If disabling the main and matrix outputs did not disable the motor, Stage 2
will disable all outputs, including all motor functions, most auxiliary functions and the operate relay
outputs (OPR1 and OPR2). Again, the system status display posts the error bulletin, including the
disabled outputs.
After repairs are complete, the Reset PushButton PB1 (refer back to Figure 14 for its decoder board
location) must be pressed to clear both the Stage 1 and Stage 2 ASO failures. Alternatively, power may
be removed and re-applied to the decoder.
Carry out the following actions to test the ASO circuit:
REMOVE POWER FROM THE CRANE OR MACHINE MOTORS BEFORE PERFORMING
ASO TESTS. THESE TESTS REQUIRE THE ENERGIZING OF THE OUTPUT RELAYS
USING JUMPERS. ENERGIZING THE RELAYS WHILE POWER IS APPLIED TO THE
SYSTEM MOTORS MAY RESULT IN UNDESIRED MOVEMENT OF THE CRANE OR
MACHINE. IN ADDITION, DAMAGE TO THE CIRCUIT BOARDS MAY RESULT IF THE
TEST JUMPER CONTACTS THE WRONG COMPONENT.
FAILURE TO OBSERVE THIS WARNING MAY RESULT IN SERIOUS INJURY OR DEATH
TO PERSONNEL AND DAMAGE TO EQUIPMENT.
To Next Page
Loading...
Need help?
General
