If one of the power supplies (master or slave) is defective, the gradient amplifier can still be used with just one power supply, with reduced gradient performance (halve the current). This reduced gradient performance will affect examinations, which use high gradient power, as with diffusion scanning, FMRI etc.
The remaining working power supply must be configured as the master power supply.
The power supply is configured as master by connecting the 25 pin connector labeled J1-MASTER to it.
The power supply is configured as slave by connecting the 25 pin connector labeled J1-SLAVE to it.
If 25 pin J1-MASTER and J1-SLAVE can’t be swapped because cables are too short, swap also the physical position of the power supplies.
This power supply current reduction is comparable as running the gradient axis amplifier on only three modules.
Controller dipswitch S202•Dipswitch settings S202 are used for:
–M1, M0: *uu = Test, current control for shorted load *ud = Voltage control mode *du = Coil2, current mode, 97.5 μH (Nova or Stellar) *dd = Coil1, current mode, 185 μH (Pulsar)
OSC_ON: *Up = clock On *Down = clock Off –3/4 MOD*): *Up = 3 Power Modules *Down = 4 Power modules –*) Amplifier can work with 3 instead of 4 modules: –Put the 3 modules in slot 1, 2 and 3. Leave 4 empty. –Put dipswitch ‘3/4MOD’ in the ‘Up’ position.
Controller dipswitch S202•
Dipswitch settings S202 are used for:
–M1, M0: *uu = Test, current control for shorted load *ud = Voltage control mode *du = Coil2, current mode, 97.5 μH (Nova or Stellar) *dd = Coil1, current mode, 185 μH (Pulsar)
–OSC_S/M: *Up = external clock *Down = internal clock –OSC_ON: *Up = clock On *Down = clock Off
–3/4 MOD*): *Up = 3 Power Modules *Down = 4 Power modules –*) Amplifier can work with 3 instead of 4 modules: –Put the 3 modules in slot 1, 2 and 3. Leave 4 empty. –Put dipswitch ‘3/4MOD’ in the ‘Up’ position.
274 module fault is usually a power module, 1/4 of the bridge of that axis amp. Reseat the module and check if the fault comes back. Lable the modules 1,2,3,4, from left to right. Swop 1 and 3 and see if the fault follows. If it does order power module from DirectMed Parts and tell Dave sent you.
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Punit Singh
274 gradient module fail
December 22, 2015 10:09
does anyone have instructions to make 274 gradient
run with 3 modules. module is showing fault
to rate and post a comment
Alexey Blazhevich
re: 274 gradient module fail
December 22, 2015 10:51
If one of the power supplies (master or slave) is defective, the gradient amplifier can still be used with just one power supply, with reduced gradient performance (halve the current). This reduced gradient performance will affect examinations, which use high gradient power, as with diffusion scanning, FMRI etc.
The remaining working power supply must be configured as the master power supply.
The power supply is configured as master by connecting the 25 pin connector labeled J1-MASTER to it.
The power supply is configured as slave by connecting the 25 pin connector labeled J1-SLAVE to it.
If 25 pin J1-MASTER and J1-SLAVE can’t be swapped because cables are too short, swap also the physical position of the power supplies.
This power supply current reduction is comparable as running the gradient axis amplifier on only three modules.
to rate and post a comment
ddddun
re: re: 274 gradient module fail
December 22, 2015 04:05
Controller dipswitch S202•Dipswitch settings S202 are used for:
–M1, M0: *uu = Test, current control for shorted load *ud = Voltage control mode *du = Coil2, current mode, 97.5 μH (Nova or Stellar) *dd = Coil1, current mode, 185 μH (Pulsar)
–OSC_S/M: *Up = external clock *Down = internal clock –
OSC_ON: *Up = clock On *Down = clock Off –3/4 MOD*): *Up = 3 Power Modules *Down = 4 Power modules –*) Amplifier can work with 3 instead of 4 modules: –Put the 3 modules in slot 1, 2 and 3. Leave 4 empty. –Put dipswitch ‘3/4MOD’ in the ‘Up’ position.
to rate and post a comment
Alexey Blazhevich
re: re: 274 gradient module fail
December 22, 2015 04:05
Controller dipswitch S202•
Dipswitch settings S202 are used for:
–M1, M0: *uu = Test, current control for shorted load *ud = Voltage control mode *du = Coil2, current mode, 97.5 μH (Nova or Stellar) *dd = Coil1, current mode, 185 μH (Pulsar)
–OSC_S/M: *Up = external clock *Down = internal clock –OSC_ON: *Up = clock On *Down = clock Off
–3/4 MOD*): *Up = 3 Power Modules *Down = 4 Power modules –*) Amplifier can work with 3 instead of 4 modules: –Put the 3 modules in slot 1, 2 and 3. Leave 4 empty. –Put dipswitch ‘3/4MOD’ in the ‘Up’ position.
to rate and post a comment
David Doucet
re: 274 gradient module fail
December 29, 2015 07:02
274 module fault is usually a power module, 1/4 of the bridge of that axis amp. Reseat the module and check if the fault comes back. Lable the modules 1,2,3,4, from left to right. Swop 1 and 3 and see if the fault follows. If it does order power module from DirectMed Parts and tell Dave sent you.
to rate and post a comment