Oriel 68805 User manual

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68805-M
250 Long Beach Boulevard
Stratford, CT 06497-0872
Phone: [phone]
Fax: [phone]
E-MAIL [email protected]
50 watt to 200 watt
He, HgXe & Hg
ARC LAMP POWER SUPPLY
MODEL 68805
Please read these instructions completely before operating this equipment. If there are any questions or problems
regarding the use of this equipment, please contact: ORIEL INSTRUMENTS - or - the representative from whom this
equipment was purchased.
L.O.T. - ORIEL S.A. L.O.T. - ORIEL GmbH L.O.T. - ORIEL Ltd.
9 Avenue De Laponie Im Tiefen See 58 1 Mole Business Park
Z.A. De Courtaboeuf D-64293 Darmstadt Leatherhead
91951 Les Ulis Cedex Germany Surrey KT22 7AU
France England
Phone: [phone] Phone: [phone] Phone: [phone]
Fax: [phone] Fax: [phone] Fax: [phone]
L.O.T. - ORIEL ITALIA FAIRLIGHT BV L.O.T. - ORIEL SUISSE
Viale Dei Mille, 20 Member L.O.T. - Oriel Group Moulin-du-Choc
20129 Milano Marshallweg 45 1122 Romanel-Sur-Morges
Italy 3068 JN Rotterdam Switzerland
Netherlands
Phone: [phone] Phone: [phone] Phone: [phone]
Fax: [phone] Fax: [phone] Fax: [phone]
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TABLE OF CONTENTS
I. SAFETY ..................................................................1
II. INTRODUCTION ............................................................2
III. SPECIFICATIONS ...........................................................4
IV. CONTROLS AND CONNECTIONS ..............................................5
V. CIRCUIT DESCRIPTION .....................................................11
VI. CALIBRATION AND TROUBLESHOOTING .......................................14
WARRANTY AND RETURNS
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68805-M
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I. SAFETY
SAFETY NOTES:
- Connections to or from any electrical device must never be made while the device is switched
on.
- The Oriel Model 68805 Power Supply is such a device. It has an open circuit voltage of >160
volts when the start switch is pressed, and could be dangerous if care is not exercised when the
power supply is switched on. Please follow these precautions when operating the power supply:
Make all input and output connections before turning the power supply on.
Do not use the power supply without its cover.
Ensure that the output terminals are properly connected to the lamp housing or
lamp socket before turning on the power supply.
Don't open the power supply or disconnect the output leads while the power
supply is on.
- Follow the lamp or lamp house manufacturer's recommendations and precautions when handling
and using lamps.
- Never touch the lamp's quartz envelope with uncovered fingers; definitely not when operating
the lamp or immediately after shutdown. Also, follow this precaution during lamp installation to
avoid damage to the lamp.
- Do not start the lamp with the output control set above the current rating for the lamp.
- The lamp is a source of constant current. To prevent overpowering of the lamp as it ages,
monitor its current on regular basis.
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II. INTRODUCTION
The Oriel model 68805 arc lamp power supply was designed to meet the needs of the researcher who
demands a highly regulated source of current for proper operation of arc lamp light sources. Constant
current operation of these sources of radiation is required whenever a radiometric measurement is
being made or whenever a highly stable light output is needed.
Arc lamp sources will be operated in constant current mode by the Oriel Model 68805 power supply
with the output voltage being dependent on the arc lamp’s impedance. The Oriel Model 68805 power
supply will provide a constant current of up to 11 amperes with a load voltage range of 0 to 100 volts.
A power limit, which limits the product of output voltage and current to 300 watts, protects the unit
from output overloads. A constant current power supply regulates current even into a short circuit,
andthemodel 68805 is safely limited to
12 amperes or 300 watts . Also, the inrush current to the lamp
is limited to a maximum of 12 amperes, and the reduced discharge current minimizes electrode
erosion when starting the arc lamp. The Oriel model 68805 Arc Lamp Power Supply includes all of
the circuitry to power the lamps, to operate the required external ignitor or ignitor built into Oriel arc
lamp housing, and to meter the output parameters.
The following Oriel arc lamps may be operated with the model 68805 Arc Lamp Supply:
MODEL DC DC
NO. DESCRIPTION VOLTAGE (V) CURRENT (A)
6251 75 Watt Xe 14 5.4
6263 75 Watt Xe (Ozone free) 14 5.4
6254 150 Watt Xe UV (Ozone free) 20 7.5
6255 150 Watt Xe (Ozone free) 20 7.5
6356 150 Watt Xe 20 7.5
6282 50 Watt Hg 22 2.3
6281 100 Watt Hg 20 5
6283 200 Watt Hg 47-65 3.1-4.2
6291 200 Watt HgXe 20-25 8-9.5
6292 200 Watt HgXe (Ozone free) 20-25 8-9.5
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A preset switch allows for setting the output current to the recommended operating value before lamp
start. The power supply also contains circuitry to allow for viewing the output current, the output
voltage, and the output power. There is provision for remote monitoring of these output parameters.
Remotecapability also includes an input that may be used for external control, modulation, or intensity
control.
The 68805 Arc Lamp Power Supply was designed to be a reliable and efficient current source. The
adjustable 0.5 to 11 ampere current output, the large voltage compliance from 0 volts to 100 volts,
andthe 300 watt power limit will allow it to operate all arc lamps that are rated for DC operation in this
voltage, current, and power range. The main power supply section uses offline switching technology
with the resultant increase in power conversion efficiency, weight reduction, and wide input mains
operation.
An interlock function is provided. Unless this interlock is made, the power supply will not operate.
Typical uses for the interlock on Oriel equipment are:
- Microswitches to prevent access to the lamp area (electrical, optical, and other hazards).
- Thermal cutoffs to disable the power supply if the lamp housing overheats.
Please take a few moments and familiarize yourself with the next few sections for they will provide
more details on the features, controls, and the operation of the power supply.
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III. SPECIFICATIONS
AC Mains Input: 95–135 VAC @ 8 amperes
135–270 VAC @ 4 amperes
50 or 60 Hertz, 10 ampere inrush
DC Power Output: 300 watts maximum
DC Current Output: Adjustable from 0.5 – 11 amperes
Current limit at 12 amperes
DC Voltage Output:
Preignition > 150 volts unloaded
Operating Load dependent. Total output power
should not exceed 240 watts.
Light Output Ripple:
Resistive Load < 0.25% R.M.S. 40 Hz to 40 kHz
Arc Lamp Load Dependent on lamp, and operating conditions.
Typically < 0.5% R.M.S.
Pre–Adjust Accuracy: 2%
Power Meter Accuracy: 2%
Line Regulation: 0.1% change in output current for a
95–135 VAC mains input or a
190–235 VAC mains input
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POWER
ON
OFF
OUTPUT
PREADJUST
0
AMPERES
WATTS
0
VOLTS
0
WATTS
AMPS VOLTS
68805 UNIVERSAL POWER SUPPLY
LAMP
START
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ARC LAMP POWER SUPPLY
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Figure 3-1 68805 Front Panel Layout
IV. CONTROLS AND CONNECTIONS
This section will describe the various controls, the available connections, and their function.
Please
become familiar with their uses before operating the power supply with any lamps
. This will reduce
the possibility of damaging the power supply or the lamps through improper operation.
FRONT PANEL
Figure 3–1 shows the layout for the front panel.
METER AND VOLTAGE, WATTS, AND AMPS SWITCH
The analog meter is scaled to display the output voltage, current, and wattage.
Keep in mind that
the meter monitors the output voltage of the supply not the load, and that the output power is
always displayed by the meter. The one exception is when the preadjust switch is pressed and
operating current is displayed.
The select switch enables you to momentarily view the output
voltage or current by pressing it left or right, respectively.
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OUTPUT AND CURRENT PREADJUST SWITCH
Aten turn potentiometer is used to provide a precise means of output current adjustment. A shaft
lock is mounted with this knob to lock in a setting if a readjustment from a previous current setting
is notdesired. When the preadjust switch is pressed the meter will display the value of the output
current that will be delivered to the lamp after lamp start.
POWER SWITCH
This is the AC mains power switch. In the “ON” position ac power will be switched into the main
circuitry of the power supply, and an integral indicator lamp will glow to indicate that the power
supply is on. The power switch is also a circuit breaker which will open both of the ac lines to the
internal circuitry in case of a fault within the unit.
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INTERLOCK
REMOTE
A C
J304
J302
J306
S301
J301
J307
J305
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Figure 3-2 68805 Rear Panel Layout
REAR PANEL
Figure 3–2 shows the rear panel layout and connections.
AC MAINS INPUT (J304)
J304 is an IEC style socket which will accept power cords for worldwide use of the power supply.
The AC mains cord is connected here.
LINE VOLTAGE SELECTOR (S301)
S301 sets the input voltage range for a nominal 110 VAC or 220 VAC. It is factory preset for
your area, but should be checked before using the power supply.
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INTERLOCK SOCKET (J301)
This connection must be made, otherwise the main power supply will not turn on. ORIEL normally
ships a shorting plug which mates to this socket. The shorting plug must be replaced with the
connector that is supplied with the lamp housing in order to take advantage of its protection
feature. Lamp housings available through ORIEL use this connection as a safety arc lamp shut-
off in case the access doors are opened when the lamp is operating or in case of an excessive
temperature rise within the lamp housing.
DC OUTPUT CONNECTIONS (J306 and J307)
These two UHF screw on connectors are the connections for the main DC output to the load.
J306 is the positive, and J307 is the negative. The low voltage side of an external ignitor or a
lamp housing with built-in ignitor is connected to these two outputs. Both are earth ground
isolated.
Never make any electrical connections to these sockets with the power supply on.
IGNITOR DRIVE CONNECTOR (J305)
Thisthreepin rectangular connector provides the square wave voltage signal that all Oriel external
ignitors, and housings with built-in ignitors need to generate the high voltage pulses to start the arc
lamps. The 100 volt square wave output is able to provide up to one ampere of current to the high
voltage circuitry of the ignitors.
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9 8
12
2
3
4
5
6
1
J302
7 10
11
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J302 Pin Assignment
REMOTE CONNECTOR (J302)
Access to the internal metering, and control signals is provided through this connector. It is a
twelve (12) pin circular connector with the following pin assignments:
Pin 1 External control input. A 0–5 volt DC signal will decrease the output current from the
operating level to no output, if need be.
Pin 2 Internal reference output. A 0–5 volt DC level which is proportional to the output
current. This signal should be buffered with a unity gain amplifier if it is going to be
used.
Pin 3 Input control and reference output common.
Pin 4 Not used.
Pin 5 Remote start input. A contact closure between pins 5 and 7 is equivalent to pressing
the front panel “LAMP START” switch.
Pin 6 Not used.
Pin 7 Remote start input. A contact closure between pins 5 and 7 is equivalent to pressing
the front panel “LAMP START” switch.
Pin 8 Not used.
Pin 9 Remote meter output: Power.
Pin 10 Remote meter output: Current.
Pin 11 Remote meter output: Voltage.
Pin 12 Remote meter output: Common.
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SETUP AND USE
The Oriel Model 68805 Arc Lamp Power Supply was designed for ease of use with a wide variety
of arc lamp light sources. Please follow the above precautions, and the following procedures to
use the power supply safely.
Open Circuit Setup
Make all connections to the ignitor and to the housing. If an interlock cable is available, then
connect this to the interlock socket. Otherwise, use the jumper plug that was shipped with the
power supply. The interlock operates by interrupting a 24 VAC source to an internal relay.
Therefore, this must be a jumper or contact closure and not a ground connection.
Install the arc lamp according to the directions in the housing manual.
If the lamp operating current is unknown, then determine the current setting by using Ohm’s Law:
amperes = power ÷ volts.
Check that the line voltage selector is in the proper position for operation in your area. Connect
the line cord to the IEC socket, and plug the unit into an AC outlet.
Ensure that the “OUTPUT” control knob is set to the full counter clockwise position. Turn on the
power supply. Place the meter select switch to “VOLTS” and observe that the output is .100
volts DC. Release the meter switch.
Press the “PREADJUST” switch. Read the meter display on the ampere scale. This is the
operating output current which will be delivered to the arc lamp. Turn the “OUTPUT” knob to set
the desired operating current. This step is necessary only when initially setting up the power
supply or whenever a new lamp with a different current rating is going to be used.
Note: If the previous steps are not followed damage to the lamp could occur because of the
possible higher operating current setting of the “OUTPUT” control knob
.
Press the “START” switch on the power supply front panel. The output voltage should measure
off-scale on the meter, and the ignitor should fire a high voltage pulse to begin the lamp start.
Power will now be delivered to the lamp, and the meter will display this value. To view the output
voltage or current simply place the momentary contact, meter select switch to the respective
position, and monitor the appropriate scale.
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V. CIRCUIT DESCRIPTION
GENERAL
Please refertoschematic number 68805–3–1001 when reading this section. The schematic gives
a block diagram view of the major components of the power supply. The 68805 was designed
in a modular way for reliability and for maintenance, and the schematic reflects this component
approach to the power supply design.
The input mains is applied via J304, through the circuit breaker/power switch, and the line voltage
selector to T1. T1 steps down the input to a low voltage AC (24 volts nominal) which is then
connected to the coil of K1. The AC connection is not complete unless the interlock is made by
a jumper or a contact closure.
A complete connection at J301 will energize K1 and allow mains power to be applied to the main
power supply module (27–20–007). The power supply module will then begin to operate and
convert the AC mains voltage to a line isolated DC current. The power supply module is a
state–of–the–art, current mode, switching power supply which operates at 40kHz.
The meter board (68805–1210) continuously monitors the output of the power supply via J1. It
also provides the required voltage levels for the meter, and for the remote inputs and outputs via
J2 and J302.
DC power is then delivered to the load through the rear panel mounted connectors, J306
(positive/+) and J307 (negative/-). Either of these connections may be ground referenced, if
needed, because these are line isolated outputs.
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SPECIFIC DESCRIPTIONS
Power Module (27–20–007)
This module is not meant to be field serviceable, therefore only a general theory of operation is
provided. The module is easily replaced in the field, and should be treated as a replaceable
component. Please contact your representative if any problems arise.
This module is an off–line two transistor forward converter operating at a frequency of 40kHz.
The switching stage operates in current mode for increased reliability and for improved line
voltage regulation. The input stage is connected directly to the AC mains, and line voltage
selection is done by S301. This is then rectified and filtered to provide the bulk, unregulated
DCvoltage for the switching stage. An on board, low current transformer steps down, and line
isolates the control circuit’s power source. An advanced secondary side filter network, and
feedback loop serve to maintain a constant DC output current with excellent regulation and
control.
Meter Board (68805–1210)
Please refer to schematic number 68805–3–1211 for this circuitry.
J1 pins 7 and 9 provide the AC for this circuit. This is rectified and filtered by CR1, C1 and
C3. The raw DC is applied to VR1 and VR2 which then supply the regulated +/- 15 volts for
the supervisory circuits.
The output current signal enters the board via J1 pin 6 where it is then amplified by a two
stage operational amplifier (U1). The nominal voltage gain is 85. The output of the second
stage is present at one of the inputs to U2, and is also scaled by R5 and R6 to provide the
current for the meter.
The output voltage signal enters the board via J1 pin 10. A resistive voltage divider consisting
of R8 and R11 scale this to a 0–10 volt level which is then present at the other input to U2.
Scaling for the meter is done by the R9, R13 combination.
The power reading is derived by analog multiplier U2. This integrated circuit multiplies the
proportional input representation of output current and voltage at pins 1 and 3. The output
from U2 at pin 7 is then scaled for the meter to display power.
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The reference voltage from the power module enters the meter board at J1 pin 1. It is then
connected to the front panel mounted adjustment potentiometer, R201, whose wiper is
connected to J3 pin 2. This variable voltage exits the meter board via J1 pin 2, and is then
reconnected to the power module. As the wiper voltage changes from 0–5 volts, the output
of the module changes.
J4servesasthe interface to the meter, the meter select switch, and the preadjust switch. See
schematic number 68805–3–1001.
J2 serves as the interface to the rear panel mounted remote socket to provide the signal
levels, or accept the external signal level for remote monitoring and control of the power
supply. The nomenclature for the pins is given on page 10.
The four, top mounted trimmer potentiometers are used only to calibrate the meter. They
have no interaction with the power module. Their function is as follows:
R6 Current display trimmer
R12 Power display trimmer
R13 Voltage display trimmer
R16 Preadjust display trimmer
See schematic number 68805-3-1211 for their location.
Ignitor Drive (68810-3-1601)
Please refer to schematic number 68810-3-1601 for this circuitry.
Ignitor Drive and Output Monitor Circuit
The ignitor drive PCB contains circuitry to generate the 25kHz square wave required by the
ignitor. Itis a self oscillating inverter which starts when relay K401 energizes at an open circuit
voltage of 95 volts or more. Relay contact K401-1 is closed and the start switch is pressed
to apply 24 VAC to rectifier CR401. The filtered output is used by R402 to slightly bias Q401
into conduction.
Q401 goes into conduction more and more until T401 saturates. At saturation, Q401's
collector current increases at the limit set by the beta of the transistor and input voltage. This
limits collector current to one ampere. Since di/dt is removed from T401, Q401 shuts off due
to lack of base drive. The flyback voltage is of the correct polarity to bias Q402 into
conduction, and the action repeats but of opposite polarity. The result will be a two to one
unregulated step up on T401's secondary. This is nominally a 100V P-P square wave @
30kHz. This square wave is connected to the ignitor via J305 on the rear panel.
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VI. CALIBRATION AND TROUBLESHOOTING
Warning: Thepowermodule (27-20-007) of the model 68805 power supply has no field serviceable
parts. Do not attempt to repair the module in the field. If a failure of the module occurs,
then contact your local representative for service.
Only qualified service personnel should attempt repair or calibration of the unit. They
must exercise extreme caution when working in the unit with power on. Dangerous
voltage levels exist within the unit which could harm if proper, electronic troubleshooting
techniques are not adhered to.
CALIBRATION
The required equipment to calibrate the power the power supply, is an external 300 watt load
resistor of less than 3S, and external voltage and current meters.
With the unit off, remove the top cover, and connect the ammeter in series with the load resistor.
Connect the voltmeter across the positive and negative output posts at the rear panel. Turn the
“ADJUST” knob full counter–clockwise.
Switch the power supply on and adjust the output via the front panel control so that the output
current, as viewed on the external ammeter, is an even value. Hold the meter select switch in the
“AMPS” position and trim R6 so that the front panel meter display agrees with the external
ammeter.
Release the meter select switch and without changing the control knob setting press the
“PREADJUST” switch. Be sure that you are reading this value on the current scale when doing
this calibration. Trim R16 so that the front panel meter displays the output current setting. There
will be a slight decrease in the output current when this switch is pressed. Therefore, adjust R16
to the output current value that was measured with the external ammeter prior to pressing this
switch.
Hold the meter select switch in the “VOLTS” position and, rotate the front panel control knob so
that the output voltage is an even value. Trim R13 so that the front panel meter agrees with the
external voltmeter.
Release the meter select switch and adjust the output with the front panel control until the product
of the external meters is an even value. Trim R12 so that the front panel meter agrees with this
value. Calibration is now complete. Switch the power supply off, and replace the cover.
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TROUBLESHOOTING
Thepossibility of a fault occurring during its operational life is likely with any electronic equipment.
We have strived to make this the most reliable power supply available. A competent service
person should perform any maintenance if a problem does occur . It is strongly recommended
that field repair be limited to the repair or replacement of all components which are readily
available.
No attempt should be made to repair the power supply module to the component level .
Simply replace and return the defective module to Oriel.
A flow chart of a suggested approach to troubleshooting is on the next page. Please use it as a
guidefor resolving any problems. This is general in nature and should be used as a starting point.
Do not forget the analysis of obvious problems such as; loose or broken wires, blown fuses or
circuit breakers and unconnected external cables.
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Apply the Main Power
and Turn the Unit ON START
Is
Interlock
at J 301
In?
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Open
Circuit
Voltage
Present?
Is
Power
ON?
Check Calibration
Check AC line,
line cord,
CB 201, S 301
Insert or Repair Interlock
Press the preadjust switch.
Replace the module if there
is no adjustment, and the
meter board is OK.
Shut down, connect the
resisitive load, and turn
the unit on.
Measure 5V at J102,pin 1.
Replace module if not present.
Measure 0-5V range at J102,
pin 2. Replace module
if not present.
Does the
output adjust
from min to
max current?
Does
the Meter
display YES?
Press start switch
Is 100V
p-p present
at pins 1 & 2
of J305?
NO
Troubleshoot and repair the
ignitor drive circuit board
(68810-3-1600)
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WARRANTY AND RETURNS
Oriel Instruments warrants that all goods described in this manual (except consumables such as lamps, bulbs, filters,
ellipses, etc.) shall be free from defects in material and workmanship. Such defects must become apparent within the
following period:
1. All products described here, except spare and repaired parts: one (1) year or 3000 hours of operation, whichever
comes first, after delivery of the goods to buyer.
2. Spare parts: ninety (90) days after delivery of goods to buyer.
3. Repaired items: ninety (90) days after delivery of goods to buyer.
Oriel Instruments' liability under this warranty is limited to the adjustment, repair and/or replacement of the defective
part(s).During the above listed warranty period, Oriel Instruments shall provide all materials to accomplish the repaired
adjustment, repair or replacement. Oriel Instruments shall provide the labor required during the above listed warranty
period to adjust, repair and/or replace the defective goods at no cost to the buyer ONLY IF the defective goods are
returned, freight prepaid, to an Oriel Instruments designated facility. If goods are not returned to Oriel Instruments, and
user chooses to have repairs made at their premises, Oriel Instruments shall provide labor for field adjustment, repair
and/or replacement at prevailing rates for field service, on a portal-to-portal basis.
Oriel Instruments shall be relieved of all obligations and liability under this warranty if:
1. The user operates the device with any accessory, equipment or part not specifically approved or manufactured
or specified by Oriel Instruments unless buyer furnishes reasonable evidence that such installations were not
a cause of the defect. This provision shall not apply to any accessory, equipment or part which does not affect
the safe operation of the device.
2. The goods are not operated or maintained in accordance with Oriel's instructions and specifications.
3. The goods have been repaired, altered or modified by other than Oriel authorized personnel.
4. Buyer does not return the defective goods, freight prepaid, to Oriel repair facility within the applicable warranty
period.
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