LIC HVC-XXXX/QCW-USB User manual

Instruction Manual V1.3
Instruction Manual
High Power, High Speed, High Current
High Voltage Switch/Pulse Generator
Models: HVC-XXXX/QCW-USB
This manual contains Operating, Safety, and
Maintenance information and subjects to change without notice.
LIC Engineering
122 Calistoga Rd. Suite 210
Santa Rosa, CA 95409 USA
Phone: [phone]
Email: [e-mail] 2013 Rev.1.3

Page 2
Instruction Manual V1.3
TABLE OF CONTENTS
SECTION Pages
Safety Precaution -------------------------------------------------------- 2
1. DESCRIPTION
1.1 General ---------------------------------------------------------------------- 4
1.2 Description ------------------------------------------------------------------ 4
1.3 Specification ---------------------------------------------------------------- 6
1.4 View of Front &Rear Panel ------------------------------------------- 9
1.5 Explanation of Front &Rear Panel ------------------------------------ 11
1.7 Control Screen ------------------------------------------------------------- 13
1.9 Control Screen ------------------------------------------------------------- 21
2. INSTALLATION
2.1 General ----------------------------------------------------------------------- 22
2.2 Inspection -------------------------------------------------------------------- 22
2.3 Output Connection--------------------------------------------------------- 22
2.4 Block Diagram--------------------------------------------------------------- 24
2.5 ACLine ---------------------------------------------------------------------- 24
3. OPERATION
3.1 Preparation------------------------------------------------------------------- 25
3.1.1 CurrentDroop------------------------------------------------------------- 25
3.1.2 Average Power and Pulsesetting---------------------------------- 25
3.1.3 Rise Time, Load Impedance, & Output Voltage ------------------ 26
3.3 Starting in CW/Pulse mode----------------------------------------------- 26
3.3 Sample Waveforms --------------------------------------------------------- 28
4. MAINTENANCE
4.1 General ----------------------------------------------------------------------- 32
4.2 Caution ------------ ---------------------------------------------- ------------ 32
4.3 Trouble Shooting ------------------------------------------------------------ 32
5. WARRANTY
5.1 Warranty ------------------------------------------------------------------------ 34
5.2 Return of the unit ------------------------------------------------------------- 34

Page 3
Instruction Manual V1.3
Safety Precaution
Do not use this product in any manner not specifiedby the manufacturer. The protective
features of this productmay be impaired if it isused in a manner not specified in the operation
instructions.
Before ApplyingPower
Verify that all safety precautions are taken. Make all connections to the unit beforeapplying
power.
Groundthe Instrument
To minimize shock hazard, the instrument chassisand cover must be connectedto an
electrical ground. The instrument must be connected to the AC power mains througha
grounded power cable,with the groundwire firmly connected to an electrical ground (safety
ground) at the power outlet.Any interruption of the protective(grounding) conductoror
disconnectionof the protective earth terminal willcause a potential shock hazard that could
result in personal injury.
Fusesand/or Circuit Breaker
Only fuses with required rated current, voltage, and specifiedtype (normal blow, time delay,
etc.) should be used.Do not use repaired fuses or short-circuitedfuse holders. To do so could
cause a shock or fire hazard. If circuit breakeris activated, take a careful inspection anddon't
repeat the breakeron/off.
Do Not Operate in anExplosive Atmosphere
Do not operate the instrument in the presence of flammable gases or fumes.
Do Not Removethe Instrument Cover
Only qualified, service-trainedpersonnel who are aware of the hazards involved should
remove instrument covers.Always disconnect the power cable and any external circuits
before removingthe instrumentcover.
Do Not Modifythe Instrument
Do not install substitute parts or perform any unauthorized modification to the product. Return
the product to LIC Engineering factory for service andrepair to ensurethat safety features are
maintained.

Page 4
Instruction Manual V1.3
1.1 GENERAL
High Power, High Speed, High Voltage Switch/Pulse Generator, HVC-
XXXX/QCW-USB are designedto drive many application in CW,QCW (Quasi
Continuous Wave), andNormalPulse mode.
HVC-XXXX/QCW-USB has a built-in high efficientH.Vpower supply and
communicates closely with the outputvoltage/current.
HVC-XXXX/QCW-USB has achieved QCW high power up to 30KV/500A, and
fastest rise time of 5ns-200ns.
For customer’s different load impedance, there is a special made stripline
available to avoid the reflection caused from mismatched impedance. This
stripline enablesthe distance fromthe unit to a customer’s load 1m
(standard),or 2m(optional) keepingthe rise time of 5ns-200ns &the
minimum pulse width of 5ns.
HVC-XXXX/QCW-USB QCWuses a double isolatedUSBinterface so that
user can control the LD driver through user’s PC control screens.
The isolated USB interface is isolated from the user’s computer as well as
fromthe HVC-XXXX/QCW-USBunit. This ensures the highestnoise immunity
even in the harsh industrial environment.
HVC-XXXX/QCW-USB also uses a high speed currentsensing device to
watch the real load currentas wellas a drive signalat the same time so that
user can monitor the real operatingcondition and compare with a drive signal.
1.2 DESCRIPTION
The high current/high power High VoltageSwitch HVC-XXXX/QCW-USB
uses a high frequency zero-currentswitching power supply to minimize a
switching loss and achieve high conversionefficiency in a smallbody (up to
5KWCW Power with air cooled, and 25KW with water cooled). This zero-
current switching technology has been used for Lic’s CO2 laser power supply
since 1986.
Complete protectioncircuits:
Unit contains the completeprotection circuits to protect theunit against any
potential risks. Therearetotal 9 protectioncircuitsinstalledin the systemand
these are explained in detaillater in this manual.
1). Power Supply Faults.
2). LD-Driver OverCurrent.
3). LD-Driver OverVoltage.
4). LD-Driver &Power supply Over Temperature.
5). Pulse-Frequency Fault.
6). Pulse-Width Fault (minimum& Maximum).
7). Pulse Duty Fault
8). Product of V.I.T fault (Vd Fault)
9). Interlock.
Accurate, high speed,andhighpowercurrent sense system:
The load current issensedwith an ultra small inductance andhigh power
resistor that accuracyis +/- 1%. To minimize the inductance, we use the same
technology thathas beenusedfor our LSP-series highspeedLD-Drivers.

Page 5
Instruction Manual V1.3
50 ohmBNC output is used to monitor thereal time output current accurately.
The attenuation ratio is 5mV/A-100mV/A depends on thespecification
selected.
Built in Power Supply:
HVC-XXXX/QCW-USB High Voltage Switch uses a built-in a high efficient
Power Supply. In QCW mode, the output current is supplied through a huge
capacitor bank wherethe necessary output energy is stored. Thiscapacitor
bank ischarged and discharged at the speed of an outputpulse frequency.
The load impedancefor the charging power supply is changedfromalmost
short circuit to infinite impedanceduring this charging process. If the charging
power supply is not designed for this type of the load, the power supply may
have problems: such as overcurrent trip, taking toolong charging time, or
broken at the worst case.
Refer to 1.8 CAPACITOR CHARGING POWER SUPPLY for detail.

Page 6
Instruction Manual V1.3
1.3 SPECIFICATIONS OF HVC-XXXX/QCW
1.3.1 AC INPUT
Three phase/380V/480V/47-63Hz.
1.3.2 OUTPUT POWER
Maximum to 25KW
1.3.3 MAX. OUTPUT VOLTAGE
Up to 30KV(User selectable from1KVto 30KV)
1.3.4. OUTPUT CURRENT
Up to 500Ain QCWmode (User selectable).
1.3.5 OUTPUT POLARITY
Positive (Standard).
1.3.6 OUTPUT RISE TIME
5ns-200ns: Depends on the unit purchased.
1.3.7 MAXIMUM & MINIMUM PULSE REPETATION RATE
Minimum: Single Shot, or 0.001Hz
Maximum: 5MHz (depends on the unit
purchased)
Steps: 10ns
Accuracy: 5ns + (0.0001xperiod)
Time base: 50MHz, 50PPMcrystal oscillator
*Note: In QCWmode, the pulse rate is limited by the averagepower and the
current droop specified.
Refer to 3.1.1 Average Power and Pulse Setting for detail.
1.3.8 MAXIMUM & MINIMUM PULSE WIDTH
Minimum: 10ns (depends on the unit
purchased)
Maximum: 1000s (depends on theunit
purchased)
Steps: 10ns
Accuracy: 10ns + (0.0001xpulse width)
*Note:
In QCWmode the maximum pulse width islimited by 1). average power
specified and 2). current droop specified.
Refer to 3.1.0 Current Droop and 3.1.1Average Power andPulse Settingfor
detail.
1.3.9 PROTECTION CIRCUIT
There are total of 9 fault reasons that the unit ceases theoperation. When the
protection circuit detects those faultconditions, the unit shuts off
instantaneously indicating with FAULT light.

Page 7
Instruction Manual V1.3
OverCurrent Protection (1)forinternalpowersupply:
Protects the internal power supply against (1)direct or indirect outputshort
condition, (2) Any electrical disturbancesinduced by external or internal
noises, (3) Overload causedfromimproper load, or pulsesetting.
OverCurrent Protection(2)for output Switch:
The protection circuitfor the outputswitch activatesin 100ns. Thisresponse
time is required to protect theswitch against huge outputpower (the
maximum peak pulse power reaches to 1MW). The loadcurrentis however,
several hundred ns to several us delay time after theprotection circuit is
activated.
Overtemperatureprotection:
Detects a base temperature on which main switching devicesand other
power semiconductors are mounted. When the basetemperaturereaches to
setting level, the protection circuit activates andthe unit ceases theoperation.
Overload protection:
LNS-XXXX/HP, LNS-XXXX/QCW adjusts its averagepower automatically
when pulse setting changes, andstays always within the pre-determined
average power. When, however, the pulse setting exceedsthe predetermined
average power (by external pulsesetting, for example), the overload
protection activates to protect the internal power supply against an over load
condition.
This over load iscalculatedas a product of pulsewidth and pulse frequency.
Pulse WidthProtection:
When the setting pulsewidth, or an external pulsewidth exceeds a
predetermined value, this protectioncircuit activates.
Pulse FrequencyProtection:
When the setting pulsefrequency, or an external pulsefrequency exceeds a
predetermined value, this protectioncircuit activates.
Vd Value:
When setting Vd value exceeds a calculatedvaluebasedon presetting pulse
conditions, this protection circuit activates. Thecalculationis based on the
product of Vd value &LD current, and Pulse on time. If this fault happens,
adjust one of the following values.
1). Reduce Vd value
2). Reduce settingcurrent
3). Reduce pulse width
Interlock Input:
This is an additional safetyfeature. Unless this input is closed,the unit keeps
fault condition.
This input can be used as a remote switch as welland the cable length can
be several meters fromthe unit. This input is isolatedwith an optical isolator.
Note:

Page 8
Instruction Manual V1.3
To restart the unit fromthe fault condition, use RESET signal. Refer to
RESET signal at SECTION 1.4.4 for detail.
1.3.10 OPERATING TEMPERATURE
Ambient temperature: +10 to 40C
1.3.11 OUTPUT CONNECTORS/TERMINALS
Main Output: 1) 50ohmBNC located on rear panel, or
2) Direct stripline fromrearpanel
1.3.12 EXTERNAL PULSE INPUT BNC 1KOhmimpedance
1.3.13 DIMENSIONS (WxDxH inch)
Up to 25KW(water cooled): 17”(W) x 17.5”(D) x 10.5”(H) excluding
handle
1.3.14 WEIGHT (Lb.)
Up to 25KWCW: 57 lb (Water Cooled)

Page 9
Instruction Manual V1.3
1.4 FRONT & REAR PANELS

Page 10
Instruction Manual V1.3
1.5 EXPLANATION OF FRONT & REAR PANELS
1.5.1 Ready indicator (Yellow)
Indicates the unit is ready for operation.
1.5.2 Power Supply SW.
When an ACbreaker located on a rearpanel is turnedon, the unit stillstays
off. Only when Power Supply SW. is pushed, the internal power supply for
HVC-XXXX is energized that is indicatedby a Ready indicatoris lighted.
For safety purpose, the output isdisabled even if a mechanicalOutput On/Off
SW. stays on position after when the unit is accidentally poweredoff, and
then turned on. Toresumethe operation, just push this SW again.
1.5.3 Output Monitor
50 ohmBNC output is used to monitor thereal time output current. The
attenuationratio is 5mV/A-10mV/A depends on thespecificationselected.
The load current is sensedwith an ultra small inductance andhigh power
resistor of which accuracy is +/- 1%and its inductanceis far below0.1nH.
To minimize the inductance, we use the same technology thathas been used
for our LSP-serieshighcurrentsensingtechnology forlong time.
Note *): The oscilloscopeinput have to be terminatedwith a 50 ohmto
receive a correct waveformof the current.
1.5.4 Drive (Monitor) Signal Output
This isthe output signal to activate/deactivate theoutput switch. With this
Signal, user can synchronize the load current gatetime to user’s external
device.
1.5.5 External Trigger Input
Externalpulse condition shouldnot exceed the pulse set thatis specified
when the unit is ordered. If the pulse set exceeds thepredetermined values,
the unit ceases the operation indicatingFault condition. This is activatedby
Pulse Frequency Protection, Pulse WidthProtection,and OverLoad
Protection.
Interface conditionis TTL/CMOS, 5V/1Khom.
1.6 Rear Panel
1.6.1 USB Input
USB input is ground-isolated both from a user’s PC system and HVC-
XXXX/QCW-USB HVC-XXXX control circuit. This ensures forhigh noise
immunity even in harsh industrial environment. The USBspeed is USB 2.0
standard.
1.6.2 Cooling fan
Fan speed is controlled by internaldevicetemperature. Asthe device
temperatureincreases, the fan speed increases.
1.6.3 AC Circuit Breaker

Page 11
Instruction Manual V1.3
This is used as a power switch as well as an emergency cut off switch. To
use the unit, first turn this breaker on. If by some reason the internal safety
features do not work, this circuitbreakershut off the ACpower from a user’s
power line.
1.6.3 Output Terminal/Direct Stripline
1) Direct Stripline:
If the output is not 50ohm, there a special made transmission line is used to
connect a load to the unit. The stripline is designedfor the customer’s
specificload impedanceto carrya high currentwithout destroying the current
pulse shape (avoidingthe reflectivewave caused by the impedance miss-
matching). One side of thestrip line is just open to theload to connect by
soldering/screws.
See 2.3 section for detail.
2) H.V Switch Output
This is the H.V output for a 50ohm BNC. Customer can connect this output to
the customer’s 50ohm load.
3) H.V Switch Input
This is the H.V switch input for a 50ohm BNC. Customer can use this inputto
switch customer’s H.V output. Usually this input is connected to H.V Power
Supply Output with a 50ohmH.V coaxialcable supplied.
4) H.V Power Supply Output
This is the H.V output fromthe H.Vpower supply built in the unit. Usually this
output isconnected to H.VSwitch Input with a 50ohmH.V coaxialcable
supplied.
1.6.4 Water Inlet for 25KW model
Water inlet is ¼” NPT connector. Required water flowis 5 liter/minute
minimum and the water pressureis 3kg/cm2 minimumrequired.

Page 12
Instruction Manual V1.3
1.7 Control Screen
Control Screen
1.7.1 READY
It indicates when the HVC-XXXX is ready for operation. Whenthe unit is
ready, the READY indicatoris lighted.
It doesn’t come to a ready status only turning AC beaker located on the rear
panel. After pressing Power On button,the unit willbe ready statusin 10-30
seconds.
1.7.2 Enable/Disable
Pressing Enable/Disablebutton enables/disables the device (energizing
/disarms the device).
When the unit is powered on, itautomatically turns to Enablemode after
Ready comes. To change the following operating mode however, Disable
button must be pressedbefore thechange. Otherwise, it can’t be changed: A
pop up note is displayed saying: “Press Disable button before changingthis
selection”.
Disable requiredbefore change:
1). Output Level Selection
1.7.3 Output Device Selection - Precise/Normal Mode
This is a disabled function forHVC-XXXX/USB series models.

Page 13
Instruction Manual V1.3
1.7.4 Output Level Selection
This is a disabled function forHVC-XXXX/USB series models.
1.7.5 VD/VL Value Selection
This is a disabled function forHVC-XXXX/USB series models.
1.7.6 CW/PULSE
This changes the operatingmode either in CW, or Pulse. It can be toggled
only when Output Switch is OFF state. If either buttonis pressed while
Output Switch signal is ON, a pop up note is displayed saying: “Turn off
Output Switch before changing this button”.
When PULSE button is pressed, the control screengoes to a pulse setting
screen(Seesection1.8. Pulse Setting Screen)and a usercan set any pulse
combinations. If a user set a pulse combination that is not designedfor the
unit purchased, a FAULT indicator is highlighted.
Refer to FAULT for detail.
When the systemstarts, the mode is in CWmode and CW indicatoris
highlighted.
1.7.7 Output Current Adj.
This adjusts the actual output current and a usercan set a desired output
current by pressing anddraga mouse, or just enter numeral numbersby a
keyboard.
This adjustment isa percentage to the maximumoutput currentand reflects
directly to the Output Current/Voltage indicators described below.
1.7.8 Output Current Display
The bar graph and numeral numbers in the boxshowthe actual output
current flowing to the load. It samples at every micro-seconds in real time to
display the actual load current. The current is sensedwith a precise &high
speed current sensing device.
1.7.9 Output Voltage Display
This shows an actual output voltageof the unit. Whenevera user changes
the load current,the output voltageindicator shows the outputvoltage
correspondingto the setting output current. The bargraph andnumeral
numbers in the boxshowthe actual output voltage.*1)
1.7.10 FAULT
It indicates the LD driver is in fault condition. Thereare many safety features
builtin the unit to protect the unit againstdamageand these protection
circuits generate FAULT when the faultcondition is detected. Thefault
conditions are as follows:
1). Power Supply Faults.
2). LD-Driver OverCurrent.
3). LD-Driver OverVoltage.
4). LD-Driver &Power supply Over Temperature.
5). Pulse-Frequency Fault.
6). Pulse-Width Fault (minimum& Maximum).

Page 14
Instruction Manual V1.3
7). Pulse Duty Fault
8). Product of V.I.T fault (Vd Fault)
9). Interlock.
After removing the fault conditions, press RESET button. If there isno fault
condition exists, the unit resumes the operation.
1.7.11 Vd Fault
This is a disabled function forHVC-XXXX/USB series models.
1.7.12 RESET
To reset the unit fromthe fault condition, this buttonis pressed. If there is
fault condition exists, pressing RESET doesn’t recover the unit. First remove
the fault condition,and thenpressRESET.
1.7.13 ON/OFF/S.SHOT Output Switch
Output Switch OFF requiredbefore change:
1). CW/Pulse Selection
2). Output Device Selection
3). Output VoltageLevel Selection
This button controls LDdriver outputboth in CWand Pulse mode. Pressing
ON enables the LD driver to send the outputcurrent. OnceONbutton is
pressed, it stays on until OFF button is pressed.
In Pulse mode, the on time is not synchronized with the setting pulse. To
synchronize to the pulse, go to PULSEmode and use Run/Stop buttonon
pulse setting screen, and/oran external trigger. The detailis explained in a
separate pulsesettingmanual.
S.SHOT (Single Shot) enables theoutput current while a mouse left buttonis
pressed and disables when the mousebutton is released. This works bothin
CWand Pulse mode, but again it is not synchronized with the setting pulsein
Pulse mode. To synchronize a single shot to the settingpulse, go to pulse
setting screen, and use a singleshot availablein the screen.
1.8.1 Pulse Setting Screen
The detailof this screen and howto set the pulse combinationare explained in a
separate manual. Referto Pulse SettingManual attached with our products.

Page 15
Instruction Manual V1.3
Pulse Setting Screen
1.8.2 Pulse Setting Specification

Page 16
Instruction Manual V1.3
Pulse Board
Specifications
MIN
TYP
MAX
UNIT
I/O Configuration
Input
1 Selectable Trigger/Gate Input
Internal generator
Rate (T0 Period)
0.001
-
5,000,000
Hz
Resolution
-
10
-
ns
Accuracy
5ns + (0.0001 x Period)
T0 Period Jitter
-
-
500
ps(RMS)
Time Base
100MHz, Low Jitter PLL
Oscillator
50MHz, 50ppm Crystal Oscillator
System Modes
Single, Continuous, Burst, Duty Cycle
Burst Mode
1
-
1,000,000
Pulses
Duty Cycle Mode
1
-
1,000,000
Pulses
Pulse Control Modes
Internal Rate Generator, External Trigger/Gate
Channel
Timing
generator
Pulse Width Range
10n
-
1,000
s
Width Accuracy
10ns + [0.0001 x (width + delay)]
Width Resolution
-
10
-
ns
Pulse Delay Range
-1,000
-
1,000
s
Delay Accuracy
10ns + (0.0001 x delay)
Delay Resolution
-
10
-
ns
Jitter (Channel to
Channel)
-
-
250
ps(RMS)
Multiplexer
Any/all channels may be OR’d to any/all outputs
Time Base
Same as internal rate generator
Channel Modes
Single Shot, Normal, Burst, Duty Cycle
Burst Mode
1
-
1,000,000
Pulses
Duty Cycle Mode
1
-
1,000,000
Pulses
Wait Function
0
-
1,000,000
Pulses
Control Modes
Internally triggered or externally gated. Each channel may be independently
set to either mode.
System External Trigger/Gate Input
Trigger Input Function
System will generate a single T0 pulse for every external trigger pulse. See
“External Input Overview”
for more information.
Trigger Edge
Rising / Falling
Gate Input Function
External gate input controls the output of the unit

Page 17
Instruction Manual V1.3
Gate Input Modes
System Gate (Pulse Inhibit)
Channel Gate (Output Inhibit)
See External Trigger/Gate section for more information
Gate Polarity
Active High / Active Low
Trigger/Gate
Input Module
Threshold
0.2
-
15
V
Max Input Voltage
-
-
30
V
Resolution
-
10
-
mV
Trigger Accuracy
±3% of Threshold Voltage
Impedance
5.3K ohm + 40pF
Trigger Rate
DC
-
5
MHz
Trigger Input Jitter
-
-
20
ns(RMS)
Trigger Input Insertion
Delay
-
-
150
ns
Trigger Input Minimum
Pulse Width
20
-
-
ns
Pulse Inhibit Delay
-
-
150
ns
Output Inhibit Delay
-
-
100
ns

Page 18
Instruction Manual V1.3
1.8 Built-in POWER SUPPLY
High voltage H.Vswitch HVC-XXXX/QCW-USB contains a high efficient and
powerfulcapacitorchargingpower supply. Thistype of power supply is
designed to charge a capacitorload efficiently. It works at full power condition
regardless theload is shorted (at the beginning of charging), heavyor light.
If a normal DC power supply is used for this purpose, it may create several
problems such as:
1). DC power supplymay betripped byan over current fault.
2). There maybenofeedback loopformed betweenthe chargingpower supply and the
capacitor bank,so the accurate and realtime setting/adjustment is difficult.
3). It takes a longtime to charge up becausethe chargingprocess is very inefficient.
4). It mayneed an extra series resistor to avoid an over load conditionand this causes
a fair amountof heatingloss.
5). It maybedifficult to decrease the output voltage in short timesince the capacitor
bank isso huge.
In HVC-XXXX/QCW unit, there is a feedback loop formed between the huge
output capacitor bank and thecapacitorchargingpower supplyto regulatethe
output current accurately.
HVC-XXXX/QCW uses the double switching technology thatchargingand
discharging theoutput voltage efficiently in short time. Combinedwith the
precise current tacking system, user can set thecurrent(increasing and
decreasing)precisely regardless the outputis in heavy or no load at all.

Page 19
Instruction Manual V1.3
2.0 INSTALLATION
2.1 GENERAL
After unpacking,general inspection andpreliminary checkout procedures
should be performed to ensurethat the unitisin properworking order. If it is
determined that theunit has been damaged, the carriershouldbe notified
immediately. Contact Lic directly:
LIC Engineering
122 Calistoga Rd. Suite 210
Santa Rosa, CA 95409 USA
Tel: [phone]
email: [e-mail]
2.2 INSPECTION
Check for damage incurredduring shipment as follows:
1) Inspect unit case for cracking, bending, andotherobvious signsof
damage.
2.3 OUTPUT CONNECTIONS
Connect the stripline/coaxial cable to theload usinga soldering iron, or
screws.
The physical distance betweenthe loadand tip of the stripline/coaxial cable
must be as short as possible.
Do not use any extra wires to connect between the stripline/coaxial cable and
a load.
USING SUCH EXTRA WIRES WILL INCREASE A RISE AND FALL TIME
DRAMATICALLY.
2.3 Block Diagram of the unit

Page 20
Instruction Manual V1.3
2.4 AC LINE CONNECTION
ConfirmACGND (Earth GND) is connected to the power supplyGND.
Confirmthat ACline voltage is properfor the unitordered, andACpower to
the unit is still off. The standard centervoltages are:
380V/three phase, +/- 10%
.