SERVICE CALL CONDITIONS
B234/B235/B236/D101/D102/D103 4-112 SM
Converter Control Module
The following devices provide primary protection against current surges:
• Energy save converter
• 1st Converter
• 2nd Converter
• 3rd Converter
• 4th Converter
Each converter generates the dc currents that are used by the CPU, motor drive
boards, and other parts of the mainframe. Each converter is provided with a
protection circuit to detect power surges.
As shown in Table 3, the power supply to the mainframe that is interrupted
depends on which protection circuit is opened as a result of a power surge:
• The protection circuit of the energy save converter cuts all power if a problem
occurs in the energy save converter.
• If the problem occurs in the 1st converter, power to the 1st, 2nd, 3rd, and 4th
converters is interrupted.
• If the problem occurs in the 2nd converter, power to the 2nd, 3rd, and 4th
converters is interrupted.
• If the problem occurs in the 3rd converter, power to only the 3rd converter is
interrupted.
• If the problem occurs in the 4th converter, power to only the 4th converter is
interrupted.
Table 3: Converter Protection Circuits and Related Output Power Interrupts
Converter Output Name Energy
Save
1st 2nd 3rd 4th
VccE O Energy Save
VcaE O
VccL O O 1st
Vcc O O
Vaa1 O O O
Vaa2 O O O
2nd
Vaa3 O O O
Vaa4 O O O O 3rd
Vaa5 O O O O
Vmm1 O O O O 4th
Vmm2 O O O O
Important!
To reset the machine after a protection circuit has opened:
1. Switch off the operation switch.
2. Switch off the main power switch.
3. Allow the machine to remain off for at least 5 minutes.
4. Turn on the main power switch.
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