FU - mA

Program

Read Focus Limits

Window asks for Focus number. Type in focus number FU-mA (1...6):

 

table (focus number FU-mA)

 

 

filament converter PCB

focus number

 

focus number FU-mA

FU-mA    EZ119

CU EZ139  (0...8 = max 9)

1

large focus tube 1

filament circuit 2

focus number 2

2

small focus tube 1

filament circuit 1

focus number 0

3

large focus tube 2

filament circuit 2

focus number 5

4

small focus tube 2

filament circuit 1

focus number 3

5

large focus tube 3

filament circuit 2

focus number 8

6

small focus tube 3

filament circuit 1

focus number 6

 

 

After <Apply> a data screen comes up.

 

focus:

see table ‘focus number FU-mA’ above

deinstall:

 

 

Umin [kV]:

minimum kV value,

default 40kV for radiographic tubes,
default data in tube data file
modification with ‘Tube Limits’ possible
modified values appear after adaptation

Umax [kV]:

maximum kV value,

default 150kV for radiographic tubes,
default data in tube data file
modification with ‘Tube Limits’ possible
modified values appear after adaptation

Uiso [kV]:

focus specific value, default value will be overridden after adaptation (generator version = max available emission current dependent) Uiso is the kV value, from which on the filament current can be decreased to drive always the max kV dependent emission current (with rising kV)

Pmax [W]:

maximum focus output power,

default value in tube data file
value might be different (lower) after tube adaptation
(e.g.SRO33/100 with Optimus 50:
Pmax after adap = 50kW instead of 80kW)

IFmax [mA]:

max filament current limit,

default value in tube data file
value might be different (lower) after tube adaptation
e.g. Pmax tube > Pmax generator

IFregelmax [mA]:

=

IFmax + analog offset value for regulation purposes during boost up,
typically
IFmax + 200mA

Philips tube :

 

physical filament circuit, see table ‘filament converter PCB FU-mA EZ119’

FILsel :

 

 

FILcir:

 

 

I0 [uA]:

I0 =

max emission current at Umin (typically 40kV = default)

up to

I110 =

e.g. max emission current at Umax (typically  150kV = default)

I120 [uA]:

 

(I0 equals 40kV)  +  (I110 equals 110kV)  =  150 kV
all values in-between are (default) specified tube data coming from the installation disk data file, values (might) change when modified in the ‘Tube Limits’  screen and after adaptation

CU physical fil:

 

CU can handle 9 filaments at max 3 tubes, see table ‘focus number CU EZ139  (0..8 = max 9)’

CU checksum fil:

 

 

 

 

Faultfind

 

 

Logging Tables

 

 

Read Actual Status

 

Gives the actual status of the filament circuit. Several entries are possible in the three fields.

foc

=

see table (‘focus number FU-mA’)

static

=

condition of the filament like:
FOCini    no tube programmed
normal     tube programmed and adapted

dynamic

=

actual dynamic condition like:

        off             - no tube programmed

                          single focus tube, this circuit not in use

        standby     in standby without error

        ctrl Xray     during exposure or fluoro

 

 

Read status Trace

 

Displays the last 10 activities with FU_mA. All fields have several entries possible. details to be continued

time

 

relative time [ms] of the last 10 status changes

foc

 

see table (‘focus number FU-mA’)

old sta

 

old static condition before status change

old dyn.

 

old dynamic condition before status change

signal

 

status change command

new sta

 

new static condition after status change

new dyn.

 

new dynamic condition after status change

 

 

 

Read Error

 

 

Error: Info

 

Displays an error code and sometimes the reason for the error entry.

class:

Three error classes are possible:

 

warning:

Something happened being worth to be logged in the trace.

Warnings are logged, but they are not displayed at the control desk and do not lead to a switch off of the exposure.

If analog measurements e.g. increase the first limit, there will be an internal warning entry, which can be fixed during maintenance

 

error:

An error always leads to an exposure off  command. The error code will be displayed at the control desk, which can be reset with the reset labeled button or with any other.

 

fatal:

Fatal errors might be displayed at the control desk, but not in all cases. If there is a communication breakdown a fatal errormight not be possible on the CAN bus.As all error entries are logged in CU the information has to get to CU. None of the units has a memory to keep         the fatal condition when the generator has been turned off. So the information is lost. The only way to log it is by pushing the on button to warm reset the generator. Then the fatal error condition might be transmitted to CU.

error code:

 

The error code is a 4 digit code.

-          The first 2 digits represent the function unit, see table in Service manual FAULTFINDING.

-          The last 2 digits give details of the error code, see details in Service manual FAULTFINDING.

error explanation:

 

gives a brief explanation

task name:

 

is the task name of the function unit process during the error
ignore
for troubleshooting

procedure name:

 

is the procedure name of the FU process during the error
ignore for troubleshooting

previous warning:

 

might display a previous message

previous explanation:

 

might display a previous explanation

parameter:

 

might be displayed if available

 

 

 

Error: Actual Status

 

Displays actual status during error: see Read Actual Status’

 

 

 

Error: Status Trace

 

Displays status trace during error, only 3 entries: see ‘Read Status Trace’

 

 

 

Error: HW Set Values

 

 

If SW set  (filament circuit 1)  [mA]:

 

filament current setpoint
filament circuit: see table

If SW set  (filament circuit 2)  [mA]:

 

filament current setpoint

filament circuit: see table

FI ON (filament circuit 1):

 

on  =    filament circuit 1 active (small focus)

-if all ready conditions present, activates triac

V36 on EZ119 for intermediate DC circuit, but only in case of a two filament  tube

off =      filament circuit 1 inactive, e.g.

-          during start up

-          during adap of large focus

-          error condition

-          single focus tube (using large only)

FI ON (filament circuit 2):

 

on  =    filament circuit 2 active (large focus)

if all ready conditions present, activates triac

V36 on EZ119 for intermediate DC circuit

off  =     filament circuit 1 inactive, e.g.

-     during start up

-     during adap of small focus

-     error condition

EN_STOP_X:

 

on   =

off.  =

EN_X_ACT:

 

on   =

off   =

GRID control:

 

on   =

off   =

GRID mode:

 

on   =

off   =

Error: Read HW Values

 

 

IF nominal            

(filament circuit 1)  [mA]:

filament current setpoint small focus (see table)

 

(ilament circuit 2)  [mA]:

filament current setpoint large focus (see table)

IF actual

(ilament circuit 1)  [mA]:

(filament current actual value small focus measuring point EZ119 X5 - (X8 gnd) 2.5A / V

 

(ilament circuit 2)  [mA]:

(filament current actual value large focus measuring point EZ119 X7 - (X8 gnd)  2.5A / V

intermed circuit voltage (fil. cir. 1) [V]:

 

intermediate DC supply of filament converter 1

small focus (typically 325VDC)

intermed circuit voltage (fil. cir. 2) [V]:

 

intermediate DC supply of filament converter 2

large focus (typically 325VDC)

FU-mA version:

 

hardware version of FU_mA

CAN identifier:

 

address of unit on the CAN bus

ignore for troubleshooting

CTRL_X_C:

 

on / off = status of CTRL_X_C/ signal during event

X_ACT_S:

 

on / off = status of X_ACT_S/ signal during event

 

 

 

Error: Specific Informations

 

might display information if relevant for event

 

 

 

Functional Tests

 

 

test watchdog

 

activates watchdog of FU_mA, red LED turns on and remains on, activate warm reset to restart generator

no PC access & communication during this (FATAL ERROR) status

 

 

 

Monitoring

 

 

read If nominal

 

type in filament circuit number, see table ‘filament converter on FU-mA EZ119’ 

read If actual

 

type in filament circuit number, see table ‘filament converter on FU-mA EZ119’ 

read intermed circuit voltage

 

type in filament circuit number, see table ‘filament converter on FU-mA EZ119’ 

read Ie measuring trace

 

A ‘table’ of 100 individual screen comes up, screen 1/100 is the last logged value, 100/100 the oldest.

The mA value is measured every 2 ms. With low mA values (e.g. during fluoro or low-mAs tomo) there might be 0mA entries.

read 8 bit port

 

ignore for troubleshooting

read 16 bit port

 

ignore for troubleshooting

read memory

 

ignore for troubleshooting

Read Ie corrections

 

 

foc

 

filament number, see table ‘focus number FU-mA’ 

Ie offset valid

 

usual display:

Ie offset O.K

correction active

 

default display:

if tube adapted:

Ie offset corr. active

Ie offset + R corr. active

ofs  [uA]

 

default mA offset current value of mA measuring circuit G100 = 4000uA corrected value appears after adaptation

R  [Mohm]

 

default value (no tube or nor adapted) = 0 MOhm
corrected (measured during adaptation) value should be close to 200 MOhms this value is required to be filled in the mAs correction formula, see Service manual ACCEPTANCE

Adaptation Results

 

 

Select Adaptation Table for Reading

 

Only possible with an adapted filament

focus:

 

type in filament number, see table ‘focus number FU-mA’ 

U  [kV]:

 

type in a kV value between 40...150kV (or whatever the limit is)

 

 

 

Read Previously Selected Adaptation Table

 

Displays tables of different sizes (kV stage dependent) after the filament has successfully been adapted.
Screen (or value line) 1/xx always displays the individual standby filament current at 100uA.
Screen xx/xx displays a filament current which is just one step above the limit filament current.

If  [mA] :

 

filament current

lowest value

highest value

 

=

=

 

standby filament current

upper filament current limit + a little bit on top

 

 

table size depends on the filament current mA steps (individual for every kV stage)

Ie  [uA] :

 

emission current at the given filament current

boost time  [ms] :

 

how long it takes to boost up from a specific emission current (filament temperature) to a higher emission current (higher temperature) with the boost current = max filament current  + 2A  (positive boost)

blank time  [ms] :

 

how long it takes for the filament to ‘cool down’ from a specific emission current to a lower emission current (negative boost)

 

 

to get to a lower mA value the filament current goes down to 0.5A
(0.5A is required as lowest current to feed a grid switch unit, if present)

 

 

typically the negative boost time is 2-3 times positive boost time