1.7.

5 Starter for the CXB-400C (ST-7011, B)

1.7.5.1 Outline
This starter is a three-phase inverter power supply unit for driving the anode of the
4-MHU X-ray tube (CXB-400C). This unit is mounted in the gantry rotation unit. When
the power to the gantry is turned ON, the starter outputs an anode driving voltage to the
X-ray tube. (When the power is turned ON, the starter unit outputs a voltage
continuously even when scanning is not performed.)
The 4-MHU tube has a non-contact bearing that uses liquid metal as the lubricant. At
low-temperatures this lubricant may solidify, with the result that the anode does not
rotate. To prevent the tube from being damaged due to X-ray exposure when anode
rotation stops, this starter unit is provided with an interlock function for detecting anode
rotation stoppage (lock status).

1.7.5.2 Composition
The starter consists of the following components packaged in a chassis.

(1) INV (inverter)

(2) OP (microcomputer circuit)

(3) NF (noise filter)

(4) F61-F63 (fuse/fuse holder)

(5) CT (current transformer)

(6) Interconnecting cables (4 cables)

1.7.5.3 Ratings
(1) Line frequency : 50 Hz/60 Hz

(2) Maximum output frequency : 160 Hz

(3) Input voltage : 172 V to 220 V

(4) Output voltage : Voltage is indicated as a percentage assuming that

an input voltage of 200 V is 100% (reference).

Output setting value Reference voltage

Mode
(V/Hz) value (V) *1
50/50 Tube type identification 41 to 51
130/50 Start-up 126 to 132
168/120 X-ray output, rotation detection 160 to 169

*1: Reference voltage value (voltmeter: Yokogawa digital power meter WT130)
Since the inverter output voltage is a pulse output (PWM waveform),
measurements obtained using a general-purpose voltmeter may differ from
the reference voltage values.

No. 2D201-113EN*J
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 Cover

Inverter
LED

Figure A Micro-
computer
LED

RSP01
To HFG AC/CONTROL
CNN07 TBX01
RSS04
To X-ray tube H.E. CNN4
RSS03
CNS03 To HFG AC/CONTROL CNN4

To HFG AC/CONTROL TB
RXE06
To HFG H.V. ground
Figure B

Inverter
(1)

Figure A
LED
Micro- Inverter
computer (2)
circuit

S1 LED Fuses/
Fuse holders
F61-F63 Noise filter

CNS03 CNN07
TBS02 Figure B
TBS01

Layout of parts in the starter chassis

No. 2D201-113EN*J
35
1.7.5.4 Outline of functions of components

Component name Function

Inverter (INV) Drive voltage output to the X-ray tube unit (anode drive motor)
Rotation detection
An inverter output power monitoring function is used to detect
the X-ray tube unit stator power when the inverter output is
set. The detected power is compared with the power range for
the normal anode circuit preset in the microcomputer circuit. If
the power is outside the range, the system determines that the
anode circuit is abnormal.
Inverter output current detection (tube type selection
protection)
An inverter output current monitoring function is used to
automatically check whether or not the tube type set by the
microcomputer circuit switch matches the tube type connected
to the starter.
Current transformer Open phase detection
(CT)
The current transformer detects the current of each phase in
the anode drive motor and outputs the current of each phase
to the microcomputer circuit. The phase when output is zero is
handled as the open phase.
Microcomputer circuit Inverter operation control
(OP)
Noise filter (NF) Reduction of system power supply input line noise
Fuse (F61-63) Protection of the system from excessive current
(rated current: 15 A)

No. 2D201-113EN*J
36
(1) Input/output signals and protection

(a) Input/output signals

<1> Input (input to the microcomputer circuit (OP))

• [READY] signal

When this signal is received from the HFG in normal stand-by mode,
the starter enters acceleration mode and then remains in X-ray
output mode continuously. When this signal is turned OFF, the
starter returns to normal stand-by mode.
(An OFF signal within 1 second is ignored for 7 seconds after this
signal is input.)

• [TUBE THERMAL ERROR] signal

If the X-ray tube overheats, the thermal switch of the X-ray tube unit
opens. When this signal (open signal) is received by the
microcomputer, voltage output from the starter to the X-ray tube unit
is terminated.

• [TUBE FLOW ERROR] signal

If the oil cooler of the X-ray tube unit stops, the flow switch of the
X-ray tube unit opens. When this signal (open signal) is received by
the microcomputer, voltage output from the starter to the X-ray tube
unit is terminated.

<2> Output (from the microcomputer to the HFG)

• [TUBE THERMAL ERROR] signal

The input thermal switch status is output to the HFG. This signal is
closed normally. When the thermal switch of the X-ray tube opens,
this signal opens also.

• [TUBE FLOW ERROR] signal

The input flow switch status is output to the HFG.

This signal is closed normally. When the flow switch of the X-ray
tube opens, this signal opens also.

• [STARTER NORMAL] signal

This signal indicates whether the inverter is normal or abnormal. It is

closed if the inverter is normal and open when the inverter is
abnormal.

• [STARTER Set Up] signal

When the [READY] signal is input, this signal indicates that the
anode rotation is normal. In the normal status, this signal is closed
within 6 seconds after the [READY] signal is input. If an anode
rotation error is detected although the [READY] signal is input, the
output switch opens.

When the switch for this [STARTER Set Up] signal is open, X-ray
exposure is disabled.

No. 2D201-113EN*J
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 (b) Signal input/output circuits

<1> Input signals

• [READY] signal

Starter side HFG

(microcomputer circuit CNS03) (XCS CNN4) +5 V

1 1

2 2

• [TUBE THERMAL ERROR] and [TUBE FLOW ERROR] signals

Starter side
(microcomputer circuit CNS02) TBS02 X-ray tube/Heat exchanger
9 1
10 2
11 3

<2> Output signals

• [TUBE THERMAL ERROR] and [TUBE FLOW ERROR] signals

HFG
+5V
+5V

Starter side
(microcomputer circuit CNS03) TB
THERMAL
6 9
FLOW
8 7
9 10

• [STARTER NORMAL] and [STARTER Set Up] signals

HFG
+5 V
Starter side
(microcomputer circuit CNS03) XCS PWB

1 1
NORMAL
4 3
Set Up
5 4

No. 2D201-113EN*J
38
(c) Protection function

<1> Anode rotation abnormality: (Related signal: [STARTER Set Up] signal)

This indicates the case that the anode does not rotate even when the
rated voltage is applied.

• Detection method : The power consumption of the X-ray tube unit

stator is monitored when the inverter output is
set. The inverter output power monitoring
function is used.

X-ray tube Microcomputer circuit LED display

type normal rotation range Detection mode

CXB-400C 11 to 30 168 V/120 Hz

• Actions:

(Abnormality while the power is turned ON):

The sequence of start-up mode - X-ray output mode is repeated for

up to 40 minutes to melt the solidified bearing lubricant. If anode
rotation does not start even after 40 minutes has elapsed, output to
the X-ray tube is stopped.

(Abnormality during rotation):

If abnormal anode rotation is detected in output mode, the sequence

of start-up mode - X-ray output mode is performed once. If normal
anode rotation is not restored, output to the X-ray tube is stopped.

When normal anode rotation is restored by performing the above

actions, anode rotation is performed continuously in normal stand-by
status.

<2> X-ray tube unit overheat protection: (Related signals: [TUBE

THERMAL ERROR] and [TUBE FLOW ERROR] signals)

• Definition : This protection is activated when the

temperature of the X-ray tube housing
exceeds the specified limit or when the supply
of cooling oil is interrupted due to malfunction
of the oil cooler.

• Detection method : The microcomputer circuit detects that the

thermal switch or the flow switch of the X-ray
tube unit is open.

• Actions : Voltage output to the X-ray tube is terminated.

The switch for the output signal to the HFG
opens.

No. 2D201-113EN*J
39
<3> Starter abnormality (trip): (Related signal: [STARTER NORMAL] signal)

• Definition : Indicates input/output overcurrent to/from the

inverter and overheat of the inverter.

• Detection method : Based on the internal protection function of

the inverter.

• Actions : For an input-side overcurrent, the fuse blows

and the voltage supplied to the inverter is
interrupted. For an output-side overcurrent or
overvoltage, or overheat, the internal
protection function of the inverter is activated.
In both cases, the switch for the [STARTER
NORMAL] signal opens.

• Operation reset : If the starter is abnormal, the microcomputer

circuit LED lights to indicate the abnormal
message. If this abnormal message is
displayed continuously for more than 1
second, the starter performs reset operation
by itself and standard operations when the
power is turned ON are performed. If the
abnormal message remains lit even after this
operation is repeated three times, it is handled
as a starter abnormality and voltage output to
the X-ray tube remains stopped.

<4> Disconnection
This indicates the case that at least one of the three phases on the
inverter output side is disconnected.

• Detection method : Each of the cables for the three phases of

inverter output is passed through the hole in
the current transformer and the
microcomputer circuit monitors the current
transformer output. Disconnection is detected
if the output is zero.

• Actions : Output to the X-ray tube is stopped.

(Automatic recovery is not performed.)

<5> Tube type selection function

If the tube type set by the microcomputer circuit switch does not match
the tube type actually connected to the starter, starter output is stopped.
(Since the ST-7011 supports both the CXB-400B and CXB-400C X-ray
tubes, it is provided with a tube type selection function employing a DIP
SW and the tube type selection protection function.)

• Detection method : The type of the connected X-ray tube is

identified within approximately 5 seconds after
the power is turned ON and starter output
starts.
If the inverter output current monitoring value
at 50 Hz/50 V is outside the threshold range
set for each X-ray tube type, the tube type
setting is judged to be incorrect.

No. 2D201-113EN*J
40
 • Actions : Starter output is stopped. At this time, the
microcomputer circuit LEDs light as shown in
the table below.
S1 setting and tube type rechecking are
required.

Starter setting tube type LED2 LED1 Normal threshold range

CXB-400C 2 E 26 to 44

When the tube type that has been set matches the tube type that is
connected, the power monitor value is displayed on the microcomputer
LED display.

• Tube type selection setting method

Set DIP switch S1 on the microcomputer circuit as shown in the

table below before the power of the starter is turned ON.

Starter output can be obtained only when setting is performed as

shown in the table below.

DIP switch name: S1

Tube type 1 2 3
CXB-400C ON ON OFF

DANGER: Do not change the setting of DIP switch S1 on

the microcomputer circuit while power is
supplied to the starter for CXB-400C because
there is a risk of electrical shock.

S1 ON

1 2 3

INVERTER OP61A
TOOC4012

LED2 LED1

No. 2D201-113EN*J
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1.7.5.5 Output sequence
(1) Sequence in standard operation
Input side

Starter power supply OFF ON OFF

[READY] signal OFF ON OFF

0 Hz 0 Hz 50 Hz 50 Hz 120 Hz 120 Hz Less than 6 sec 120 Hz 120 Hz 0 Hz

0V 0V 50 V 180 V 168 V 168 V 168 V 168 V 0V
120 Hz
50 sec 5 sec 1 sec 17 sec
Starter output 168 V
130 V
4 sec
Output side

[STARTER NORMAL] OFF ON OFF

signal (Open) (Closed)

[STARTER Set Up] OFF ON OFF

signal (Open) (Closed)

ON
Starter power supply OFF
Input side

ON
[READY] signal OFF

120 Hz
Starter output
(Frequency only)
50 Hz

0 Hz
Output side

[STARTER NORMAL] ON
signal
OFF

[STARTER Set Up] ON

signal
OFF

Note: : Detection of normal anode rotation

: Tube type judged to be normal

No. 2D201-113EN*J
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 (2) Sequence when anode rotation is abnormal (defrosting sequence)

When the power of the starter is turned ON (if abnormal anode rotation occurs and
then normal anode rotation is achieved within 40 minutes after power is supplied)
Input side

Starter power supply OFF ON

[READY] signal OFF ON OFF ON OFF

0 Hz 0 Hz 50 Hz 50 Hz, 180 V, 1 sec 120 Hz 6 sec or less 120 Hz

0V 0V 50 V 168 V 168 V
50 Hz, 130 V, 4 sec 120 Hz
50 sec 5 sec
120 Hz, 168 V, 25 sec 168 V
Starter output
Output side

Repetition (less than 40 minutes)

[STARTER NORMAL] OFF ON

signal (Open) (Closed)

[STARTER Set Up] OFF ON OFF

signal (Open) (Closed) (Open)

ON

Starter power supply OFF

Input side

ON

[READY] signal OFF

120 Hz
Starter output
(Frequency only)
50 Hz

0 Hz
Output side

[STARTER NORMAL] ON
signal
OFF

[STARTER Set Up] ON

signal OFF

Note: : Detection of normal anode rotation

: Tube type judged to be normal
: Detection of abnormal anode rotation

X-ray exposure is disabled even though the [READY] signal is input when anode
rotation is abnormal because the switch for [STARTER Set Up] signal is open.

No. 2D201-113EN*J
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 (3) Sequence when a TUBE THERMAL/TUBE FLOW error occurs

Recovery (20 sec or more after power is supplied) Non -recovery

Starter power supply OFF ON OFF ON

Input side

[READY] signal OFF OFF

[TUBE THERMAL] OFF: Abnormal ON: Normal OFF: Abnormal
/[TUBE FLOW] (Open) (Closed) (Open)
signals
0 Hz 0 Hz 50 Hz 50 Hz 120 Hz 120 Hz 0 Hz
Starter output 0V 0 V 50 V 130 V 168 V 168 V 0V
50 sec 5 sec 15 sec
Output side

[STARTER NORMAL] OFF ON Same as left

signal (Closed)

[STARTER Set Up] OFF

(Open) Same as left
signal
[TUBE THERMAL]
/[TUBE FLOW]
OFF: Abnormal ON: Normal OFF: Abnormal
(Open) (Closed) (Open)
signals

ON ON
Starter power supply
OFF OFF
Input side

ON ON
[READY] signal
OFF OFF

[TUBE THERMAL] ON ON
/[TUBE FLOW]
OFF OFF
signals

120 Hz
Starter output
voltage
50 Hz

0 Hz 0Hz
Output side

[STARTER NORMAL] ON ON
signal
OFF OFF

[STARTER Set Up] ON ON

signal OFF
OFF

[TUBE THERMAL] ON ON
/[TUBE FLOW] OFF
OFF
signals

No. 2D201-113EN*J
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 TBS02
Main circuit system
11
1.7.5.6

Heat exchanger
12 200 V 50/60 Hz
Capacitor
50/60 Hz RST E 4
INV Heat exchanger
3 φ 200 V
X-ray tube GND
R F61 1 E4 R U 1

S F62 2 5 S V 2 X-ray tube

NF
stator coil
Block diagram

T F63 3 6 T W 3

TBS01

CT
Control circuit system
U

45
X-ray tube V P24 200 mA
stator coil Heat exchanger
W CC
24 VDC
FLB

No. 2D201-113EN*J
CNN06 CNN05 CNN07
FLC INV
HFG
TB (7, 9, 10)

TBS02
CNS CNS CNS03
8 02 01
X-ray tube CNN04
9
OP HFG
thermal SW CNN4
Heat exchanger 10
flow SW

Starter block diagram

1.7.5.7 Starter electrical diagram

ST-7011
X-RAY TUBE TBS01
1. Stator Coil U White 1
2. Stator Coil V Black 2
3. Stator Coil W Orange 3
CNN01 5. GND Green/Yellow 4
7. Getter Yellow
8. Getter Purple TBS02
9. Center Metal White 5
6
CNN02 Tube Thermal White 7
Tube Thermal Black 8
9
HEAT EXCHANGER 10
A4. GND Green/Yellow 11
A2. Tube Flow Orange 12
A3. Tube Flow Red
CNN03 B4. Getter Yellow
B5. Getter Purple
B2. AC200V White
B3. AC200V Black
CNN07
CNN04 1. DC24V(+) 1
2. DC24V(GND) 2

Starter electrical diagram

No. 2D201-113EN*J
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1.7.6 Starter for the CXB-400C (ST-7013)

1.7.6.1 Outline
This starter is a three-phase inverter power supply unit for driving the anode of the
4-MHU X-ray tube (CXB-400C). This unit is mounted in the gantry rotation unit. When
the power to the gantry is turned ON, the starter outputs an anode driving voltage to the
X-ray tube. (When the power is turned ON, the starter unit outputs a voltage
continuously even when scanning is not performed.)
The 4-MHU tube has a non-contact bearing that uses liquid metal as the lubricant. At
low-temperatures this lubricant may solidify, with the result that the anode does not
rotate. To prevent the tube from being damaged due to X-ray exposure when anode
rotation stops, this starter unit is provided with an interlock function for detecting anode
rotation stoppage (lock status).

1.7.6.2 Composition
The starter consists of the following components packaged in a chassis.

(1) INV (inverter)

(2) OP (microcomputer circuit)

(3) NF (noise filter)

(4) F61-F63 (fuse/fuse holder)

(5) CT (current transformer)

(6) DC power

(7) Interconnecting cables (4 cables)

1.7.6.3 Ratings
(1) Line frequency : 50 Hz/60 Hz

(2) Maximum output frequency : 160 Hz

(3) Input voltage : 172 V to 220 V

(4) Output voltage : Voltage is indicated as a percentage assuming that

an input voltage of 200 V is 100% (reference).

Output setting value Reference voltage

Mode
(V/Hz) value (V) *1
50/50 Tube type identification 41 to 51
180/50 Start-up (1) 153 to 180
130/50 Start-up (2) 126 to 132
168/120 Steady rotation, acceleration, 160 to 169
SETUP rotation

*1: Reference voltage value (voltmeter: Yokogawa digital power meter WT130)
Since the inverter output voltage is a pulse output (PWM waveform),
measurements obtained using a general-purpose voltmeter may differ from
the reference voltage values.

No. 2D201-113EN*J
47