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6-Channel F Analog Input MTA
Marshalled Termination Assemblies for ET200M Remote I/O Modules
A5E00482820-12
91
9.6
Maintenance
See Section 3,
, before performing any maintenance and observe all
warnings
Under normal operation, the
A/B
Power LED,
the
Module 1/2 Fuse LED,
and all
the
Channel Fuse LEDs
are on. If all are off, check the power supply to MTA. If
the
A/B
Power LED
is off, check the power supply to the MTA. If the
Module 1/2
Fuse LED
is off, check and replace the module fuse. If the
Channel Fuse LED
is
off, check the channel fuse and replace as necessary.
Periodically the diode boards should be tested to verify that the zener diodes will
operate correctly. Testing consists of connecting a DC power supply with a current-
limiting series resistor across each diode. The power supply should provide <=20
mA at 15 to 24 VDC. The voltage measured across the zener diodes on the #1
board should be the device's nominal specification of 6.2 VDC and on the #2 board
should be the device's nominal specification of 5.6 VDC.
The FET Switch Adapter should also be tested to insure it is operating properly.
Testing consists of turning on the FET Switches, verifying that they conduct, then
turning off the FET Switches and verifying that they do not conduct.
Note
Correct power down and power up of the FAI module and FET switches is crucial
to the proper operation of the system. The proven procedure for removal and re-
installation of the FAI module is as follows:
1. Remove the MTA-I/O cable connector from the FAI module.
2. Remove the FAI module from the backplane.
3. Perform FAI module maintenance as required.
4. Reinstall the FAI module into the backplane.
5. Reinstall the MTA-I/O cable connector onto the FAI module.
Summary of Contents for ET 200M
Page 8: ...Preface Marshalled Termination Assemblies for ET200M Remote I O Modules 8 A5E00482820 12 ...
Page 16: ...Contents Marshalled Termination Assemblies for ET200M Remote I O Modules 16 A5E00482820 12 ...
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