Agilent Technologies E7002 User manual
Agilent Technologies
Agilent E7002, E7012,
and E7014 Emergency
Discharge Unit
Reference Guide
Notices
© Agilent Technologies, Inc. 2012
No part of this manual may be reproduced
in any form or by any means (including
electronic storage and retrieval or transla-
tion into a foreign language) without prior
agreement and written consent from
Agilent Technologies, Inc. as governed by
United States and international copyright
laws.
Manual Part Number
9100383500
Edition
Rev. B, Dec. 2012
Printed in USA
Agilent Technologies, Inc.
5301 Stevens Creek Boulevard
Santa Clara, CA95051 USA
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(November 1995), as applicable in any
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Safety Notices
CAUTION
A CAUTION notice denotes a haz-
ard. It calls attention to an operat-
ing procedure, practice, or the like
that, if not correctly performed or
adhered to, could result in damage
to the product or loss of important
data. Do not proceed beyond a
CAUTIONnoticeuntiltheindicated
conditionsarefullyunderstoodand
met.
WARNING
A WARNING notice denotes a
hazard. It calls attention to an
operating procedure, practice, or
the like that, if not correctly per-
formed or adhered to, could result
in personal injury or death. Do not
proceed beyond a WARNING
notice until the indicated condi-
tions are fully understood and met.
Revision Log
Rev. B, Dec.
2012 •Added Chapter 7,
Connections
•Added E7002 to
units covered by
this manual.
E7002, E7012, and E7014 Emergency Discharge Unit 3
Contents
1 Introduction
Safety 6
Important Notices 8
Disclaimer 8
FCC Notice 8
Compliance Notice 9
Contact Information 10
Europe 10
USA 10
Agilent website (all countries) 10
2 Description and Specification
Description 12
Features 12
Description 12
Specification 13
3 Operation and Testing
Operation 16
To initiate a magnet quench 16
To test the condition of the battery and heater circuit 16
Periodic Testing 17
Magnet quench heater current 17
B0 dump switch heater current 17
Check the batteries 18
When you are done 18
4 Troubleshooting
Problems 20
Solutions 21
5 User Serviceable Parts
6 Battery Care
Replacement Batteries 26
To replace batteries 26
6 E7002, E7012, and E7014 Emergency Discharge Unit
1Introduction
Safety
•This equipment does not require any routine maintenance.
•No parts of this equipment are designated as repairable
by service personnel.
•There are no significant risks of reciprocal interference
posed by the presence of this equipment.
•Do not situate this equipment in areas of high
electromagnetic interference such as gradient amplifiers.
•This unit has been preset to a voltage range suitable for
the national supply. The unit has a selectable input
voltage: 100V~; 120V~; 230V~; 240V~. Fuses F1 and F2
must be rated to suit the input voltage:
•If selected to 100V~ or 120V~, they must be rated at
T250mAL 250V.
•If selected to 230V~ or 240V~, they must be rated at
T100mAL 250V.
WARNING
Isolate or disconnect equipment from mains supply before opening this
unit for any reason. LIVE PARTS INSIDE.
This equipment must be connected to an earthed mains supply.
For continued protection against risk of fire or electric shock, replace
fuses with the same type, rating and UL listing.
WARNING
This equipment is not suitable, and must not be used in areas with
flammable mixtures.
WARNING
If replacing the back-up batteries, follow the instructions in “Battery
Care” on page 25. The batteries are of a lead acid type and must be
disposed of at an appropriate recycling center.
CAUTION
This unit contains internal protection fuses. Follow the guidelines
below before replacement of these devices. Only suitably trained
personnel are permitted to remove covers on the equipment.
CAUTION
Do not position this equipment so that it is difficult to disconnect it
from the mains supply.
Introduction 1
E7002, E7012, and E7014 Emergency Discharge Unit 7
•To select the mains supply voltage or replace mains fuses,
open the flap on the mains input socket using a suitable
tool in the slot provided. This lets you access the voltage
select drum and two fuse trays.
•To select the supply voltage pull out the drum and rotate
until the appropriate lettering is uppermost, i.e. in line
with the drum slots, and replace. When the socket flap is
replaced the correct voltage must be visible through the
window.
•To replace the input fuse, pull out the fuse trays and
replace with the correct value of fuse. Re- insert the fuse
trays, noting the correct orientation of the arrows.
8 E7002, E7012, and E7014 Emergency Discharge Unit
1Introduction
Important Notices
Please inspect goods immediately on arrival for possible
transit damage and notify Agilent Technologies, Inc. within
three days of receipt of goods. Failure to do this will
invalidate any possible claim.
Disclaimer
Every precaution has been taken in the preparation of this
publication. Agilent Technologies assumes no responsibility
for errors or omissions. Neither is any liability assumed for
damages resulting from the use of the information contained
herein.
Details of circuitry and user- serviceable spare parts are
available upon request: see “Contact Information” on
page 10.
FCC Notice
Federal communications commission statement on Class A.
This unit has been tested and found to comply with the
limits for a Class A digital device, pursuant to part is of the
FCC rules. These limits are designed to provide reasonable
protection against harmful interference when the unit is
operated in a commercial, industrial or business
environment.
Operation is subject to the following two conditions:
•The unit may not cause harmful interference.
•This device must accept any interference received,
including interference that may cause undesired
operation.
NOTE
FCC regulations provide that changes or modifications that are not
expressly approved by Agilent Technologies could void your authority to
operate this equipment.
Introduction 1
E7002, E7012, and E7014 Emergency Discharge Unit 9
Compliance Notice
Marking by the symbol indicates compliance of this
device to the EMC (electromagnetic compatibility) and LV
(low voltage) directives of the European Community. This
unit is to be installed and operated as detailed.
Any modification or maintenance procedure undertaken that
is not approved by Agilent could nullify the marking of
this product and lead to prosecution. A 'Declaration Of
Conformity' in accordance with the above directive has been
made and is located at the address shown below.
10 E7002, E7012, and E7014 Emergency Discharge Unit
1Introduction
Contact Information
Europe
Address:
Agilent Technologies UK Ltd.
6 Mead Road
Oxford Industrial Estate
Yarnton, Oxfordshire OX5 1QU
Telephone Numbers:
To find contact information for your country, click the
following link, select your country, and then click Go.
http://www.chem.agilent.com/en- us/ContactUS/Pages/Contact
Us.aspx
USA
Address:
Agilent Technologies, Inc.
5301 Stevens Creek Blvd.
Santa Clara, CA 95051
Telephone Numbers:
Toll Free: +1 (800) 227 9770
Agilent website (all countries)
To find contact information for your location, click the
following link, select your country, and then click Go.
http://www.chem.agilent.com/en- us/ContactUS/Pages/Contact
Us.aspx
12 E7002, E7012, and E7014 Emergency Discharge Unit
2Description and Specification
Description
Features
•Magnet quench indication
•Indication that the discharge button has been operated
•Remote emergency discharge button option
•Battery back up
•Heater and battery test facility
•E7012 manually operated B0 coil dump
Description
The principle function of the E70XX emergency discharge
unit (EDU) is to initiate a ‘quench’ in order to run down a
superconducting magnet in case of any emergency. This is
achieved by passing current through a heater built into the
magnet windings. A mains derived dc voltage drives the
current into the heater. The unit is also battery backed to
ensure operation during a power failure.
A test facility is provided to check the condition of the
battery and the integrity of the heater circuit.
A further optional facility is a manual output current that is
used to energize the B0 shield switch heater, which lets the
fluxes within the B0 coil decay.
See Also For more information, see “Operation and Testing” on
page 15.
Description and Specification 2
E7002, E7012, and E7014 Emergency Discharge Unit 13
Specification
Environmental conditions
The equipment is designed to be safe under the following
conditions:
Suitable quench heater and connecting cable
Resistance 6.8 Ωminimum
18.0 Ωmaximum
Quench voltage 18V maximum
Quench cycle duration 30 seconds (+/- 20%)
Test circuit control input TTL/CMOS compatible
Test circuit monitor output TTL/CMOS compatible
B0 switch heater current 19 to 100 mA (variable)
Mains voltage 100/120/230/240V~ selectable
Mains input current 250 mA @ 100/120V~
125 mA @ 230/240V~
Mains input frequency 50/60 Hz
Fuse ratings F1, F2:
F3, F4:
•T125 mAL for 230V or 240V~ supply or
•T250 mAL for 100V or 120V~ supply
•T1.6AL 250V
Dimensions: Height:
Width:
Depth:
•128mm (3U)
•214mm (42HP)
•220mm
Class I
Ambient temperature range 10°C to 40°C
Relative humidity range 30% to 95% noncondensing
Atmospheric pressure 700 hPA to 1060 hPA
14 E7002, E7012, and E7014 Emergency Discharge Unit
2Description and Specification
16 E7002, E7012, and E7014 Emergency Discharge Unit
3Operation and Testing
Operation
To initiate a magnet quench
1Lift the emergency discharge button guard.
2Press the red button.
Current will flow into the quench heater causing the
magnet to quench very quickly. Quench current will flow
for approximately 30 seconds, as indicated by the
illumination of the front panel emergency discharge
button.
To test the condition of the battery and heater circuit
1Press the TEST button.
The BATTERY OK and HEATER OK LEDs illuminate only
if the battery capacity is okay and the quench heater
circuit is intact.
The test circuit can also be initiated by applying a TTL
input signal via the 9 ‘D’ PSU socket. A TTL output
signal is available to indicate heater integrity, making it
suitable for inclusion in digital control systems.
Option for E7012 Current can be set to flow through the B0 shield switch
heater by pressing the B0 DUMP button or via an external
TTL signal applied to the PSU or TEST connectors.
The B0 DUMP ON LED will illuminate to indicate that the
B0 shield switch heater is energized.
WARNING
Following a quench, the bursting disc must be replaced and care must
be taken to ensure that the cryostat is properly sealed to prevent air
entering the helium reservoir.
CAUTION
When the B0 shield switch heater is quenched by these methods,
the winding remains permanently ‘dumped’ until the B0 DUMP
button is pressed or the TTL signal is removed.
Operation and Testing 3
E7002, E7012, and E7014 Emergency Discharge Unit 17
Periodic Testing
It is recommended that the quench and B0 dump currents
are periodically tested to ensure correct operation.
The following test loads must be attached in place of the
service cable.
Magnet quench heater current
1To test the magnet quench heater current, press the
emergency discharge button on the front panel. The
button will illuminate.
A minimum of 10V must be developed across the ‘magnet
quench heater’ load, which indicates that 1A of current
is flowing. This current flows for ~30 seconds, then
stops.
2The remote quench buttons must also be tested. They are
tested in the same manner.
B0 dump switch heater current
1Remove the top panel of the unit.
2To test the B0 dump switch heater current, press the B0
DUMP button.
The B0 DUMP ON LED will illuminate and a minimum of
1V must be developed across the ‘B0 shield switch
heater’ load indicating that 100mA of current is flowing.
WARNING
Do not reconnect the service cable during this time as a magnet
quench will result.
18 E7002, E7012, and E7014 Emergency Discharge Unit
3Operation and Testing
3The current can be adjusted using VR2 mounted on the
PCB. Press the B0 DUMP button to stop the flow of
current.
Check the batteries
Check the dated ‘tested’ label on the batteries to ensure that
they are within their service life (refer to Battery Care
section).
When you are done
1Refit top panel to unit.
2Reconnect service cable.
3Press the TEST button.
4Verify that the HEATER OK and BATTERY OK LEDs
illuminate.
19
Agilent E7002, E7012, and E7014 Emergency Discharge Unit
Reference Guide
Agilent Technologies
4
Troubleshooting
Problems 20
Solutions 21
In this section, some common problems are discussed that
will help the Installation Engineer to find the source of the
problem and ensure the proper operation of the unit.
20 E7002, E7012, and E7014 Emergency Discharge Unit
4Troubleshooting
Problems
Front panel display conditions can give an indication of the
problem.
Display Possible Fault
No POWER LED. •Loss of F1, F2 (rear panel mounted) or
F3 (PCB mounted). *
HEATER OK LED not illuminated
when TEST button is pressed. •Loss of F4 (PCB mounted)*.
Heater and cable resistance > 18Ω.
Heater open circuit.
BATTERY OK LED not illuminated
when TEST button pressed. •Batteries not fully charged or require
replacing **
(ensure that batteries have charged for
at least 24 hours prior to testing)
B0 DUMP ON LED not illuminated •B0 shield switch heater open circuit
when B0 dump circuit operated
This manual suits for next models
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