Hioki ST5520-01 User manual

ST5520･ST5520-01 Instruction Manual
INSULATION TESTER
ST5520-01
INSULATION TESTER
ST5520
Instruction Manual
Aug.2015 Revised edition 2
ST5520A981-02 15-08H
EN

i
Contents
Introduction........................................................................................1
Verifying Package Contents.............................................................1
Safety Notes.......................................................................................3
Usage Notes.......................................................................................7
1 Overview 15
1.1 Product Overview and Features ...........................................15
■Overview ............................................................................................15
■Features.............................................................................................16
1.2 Parts Names and Functions..................................................17
1.3 MeasurementWorkow.........................................................19
1.4 ScreenCongurationandOperationOverview ..................20
■Measurement screen..........................................................................20
■Settings screen...................................................................................21
2 Preparations 23
2.1 Connecting the Power Cord..................................................23
2.2 Connecting the Measurement Leads ...................................24
■Removing and attaching the sleeves .................................................25
2.3 ConnectingtotheEquipmenttobeMeasured....................26
2.4 Turning the Power On and Off ..............................................26
■Turning on the power .........................................................................26
■Turning off the power..........................................................................26
2.5 Pre-OperationInspection ......................................................27
■Checking the insulation resistance test..............................................28
■Checking the contact check function..................................................29
3 Basic Settings 33
3.1 Setting the Test Voltage.........................................................34
ST5520A981-02
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3.2 Setting the Range...................................................................36
3.3 SwitchingtheMeasurementSpeed(FAST/SLOW) .............38
3.4 SettingtheTestDurationandResponseTime....................39
■Setting how long to apply the test voltage..........................................39
■Setting the response time...................................................................41
3.5 JudgingMeasuredValues(Comparatorfunction) ..............44
3.6 Setting the Test Mode............................................................46
3.7 AnnouncingtheJudgmentResultsUsingaBeepSound.47
4 Testing 49
4.1 Starting Measurements .........................................................49
4.2 During Measurement .............................................................51
4.3 MeasuredValueDisplay ........................................................52
4.4 CompletingMeasurement .....................................................53
4.5 AutomaticDischargeFunction .............................................54
5 Useful Functions 55
5.1 CheckingFaultyContactandContactStatus(Contact
checkfunction).......................................................................56
■Connecting test leads.........................................................................58
■Example of connection to equipment to be measured.......................58
■2-terminal contact check function.......................................................59
5.2 CheckingShortCircuitbeforeApplyingtheSetVoltage
(Shortcircuitcheckfunction) ...............................................60
5.3 Enabling/DisablingtheKeyOperations...............................65
5.4 SettingtheKeyOperationSound.........................................67
5.5 PreventingOperationErrorsattheStartofTesting
(Doubleactionfunction)........................................................68
5.6 AdjustingtheScreenContrast .............................................69
5.7 AdjustingtheBacklight .........................................................70
5.8 SettingtheFrequencyofPowerSupplyManually..............71
5.9 InitializingtheSystem(Reset) ..............................................72

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Contents
5.10 Default Setting List ................................................................73
6 Saving and Loading Measurement Conditions
(Memoryfunction) 75
6.1 Saving the Measurement Conditions
(Panelsavefunction) .............................................................76
6.2 Loading the Measurement Conditions
(Panelloadfunction)..............................................................77
6.3 Changing the Panel Name.....................................................78
6.4 Deleting the Panel Data .........................................................79
7 ExternalControl(EXT.I/O) 81
7.1 ExternalInput/OutputTerminalandSignals........................82
■Switching between current sink (NPN) and current source (PNP).....82
■Connector type and signal pinouts.....................................................83
■Signal descriptions.............................................................................86
7.2 Timing Chart...........................................................................88
7.3 InternalCircuitConguration ...............................................96
■Electrical specications ......................................................................98
■Connection examples.........................................................................99
7.4 Setting the TEST Signal OFF Timing..................................101
7.5 Checking External Control..................................................103
■Performing an I/O test (EXT.I/O test function)..................................103
7.6 UsingAnalogOutput ...........................................................104
■Connecting the output cord..............................................................105
■Setting the analog output .................................................................105
7.7 Interlock Function................................................................106
7.8 UsingtheSwitchedProbe...................................................108
■Connecting the 9299 Switched Probe..............................................109
7.9 AccessoryConnectorAssembly ........................................ 111
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Contents
8 Communications(RS-232Cinterface) 113
8.1 Interface Overview and Features........................................113
8.2 Using the RS-232C Interface...............................................114
■Setting communications conditions..................................................114
■Connecting the RS-232C cable........................................................115
8.3 AutomaticallyExportingMeasuredValuesattheEnds
ofTests(Dataoutputfunction) ...........................................117
8.4 ControllingtheInstrumentandAcquiringDatawith
Commands............................................................................119
■Remote and local states...................................................................119
■Displaying communications commands (Communications monitor
function)............................................................................................120
8.5 DataFormatTable ................................................................125
8.6 Command Reference ...........................................................126
9 Specications 151
■Environment and safety....................................................................151
■Output (output accuracy)..................................................................151
■Resistance measurement ................................................................153
■Input .................................................................................................154
■Guaranteed accuracy.......................................................................154
■Test duration ....................................................................................155
■Response time .................................................................................156
■Functions..........................................................................................156
■External interface .............................................................................159
■Other specications..........................................................................162
■Accessories......................................................................................164
■Options.............................................................................................164
10 Maintenance and Service 165
10.1 Maintenance .........................................................................165
10.2 Troubleshooting ...................................................................167

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Contents
■Error display and solutions...............................................................171
Appendix Appx.1
Appx.1 BlockDiagram.......................................................Appx.1
Appx.2 ContactCheckFunction.......................................Appx.2
Appx.3 OutputVoltageandMeasurementResistance...Appx.3
Appx.4 InuenceofCapacitiveLoad ...............................Appx.4
Appx.5 InuenceofCableLength ....................................Appx.6
Appx.6 InuenceofNoise .................................................Appx.7
Appx.7 RackMounting ....................................................Appx.10
Appx.8 DimensionalDiagram .........................................Appx.14
Index Ind.1
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Contents

1
Introduction
Introduction
Thank you for choosing the HIOKI ST5520/ST5520-01 Insulation Tester. To obtain
maximum performance from the product, please read this manual rst, and keep it
handy for future reference.
The ST5520-01 is equipped with the BCD output function of the ST5520. The artwork
of the ST5520 is used in this manual.
Verifying Package Contents
When you receive the instrument, inspect it carefully to ensure that no damage
occurred during shipping. In particular, check the accessories, panel switches,
and connectors. If damage is evident, or if it fails to operate according to the
specications, contact your authorized Hioki distributor or reseller.
Check the package contents as follows.
ST5520 or ST5520-01
Insulation Tester .........................................1Power cord .................................................1
Instruction Manual......................................1
EXT.I/O connector (pin contacts)................1
EXT.I/O connector cover.......................1 set
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Verifying Package Contents
Options
The following options are available for ST5520/ST5520-01. Contact your authorized
Hioki distributor or reseller when ordering.
L2200 Test Lead L9257 Connection Cord
9299 Switched Probe 9094 Output Cord (analog output)
9637 RS-232C Cable (9pin-9pin/1.8 m) 9638 RS-232C Cable (9pin-25pin/1.8 m)

3
Safety Notes
Safety Notes
This instrument is designed to conform to IEC 61010 Safety Standards, and has been
thoroughly tested for safety prior to shipment. However, using the instrument in a way
not described in this manual may negate the provided safety features.
Before using the instrument, be certain to carefully read the following safety notes.
DANGER
Mishandling during use could result in injury or death, as well
as damage to the instrument. Be certain that you understand the
instructions and precautions in the manual before use.
WARNING
With regard to the electricity supply, there are risks of electric shock,
heat generation, re, and arc discharge due to short circuits. If
persons unfamiliar with electricity measuring instruments are to use
the instrument, another person familiar with such instruments must
supervise operations.
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Safety Notes
Notation
In this manual, the risk seriousness and the hazard levels are classied as follows.
DANGER Indicates an imminently hazardous situation that will result in death or
serious injury to the operator.
WARNING Indicates a potentially hazardous situation that may result in death or
serious injury to the operator.
CAUTION Indicates a potentially hazardous situation that may result in minor
or moderate injury to the operator or damage to the instrument or
malfunction.
IMPORTANT Indicates information related to the operation of the instrument or
maintenance tasks with which the operators must be fully familiar.
Indicates a high voltage hazard.
If a particular safety check is not performed or the instrument is
mishandled, this may give rise to a hazardous situation; the operator
may receive an electric shock, may get burnt or may even be fatally
injured.
Indicates prohibited actions.
Indicates the action which must be performed.
*Additional information is presented below.
[ ] Indicates set items and buttons on the display in [ ].
SET
(Boldface) Bold-faced alphanumeric characters in the text indicate characters
shown on the operation keys.

5
Safety Notes
Symbols afxed to the instrument
Indicates cautions and hazards. When the symbol is printed on the instrument,
refer to a corresponding topic in the Instruction Manual.
Indicates that dangerous voltage may be present at this terminal.
Indicates the power “ON”.
Indicates the power “OFF”.
Indicates DC (Direct Current).
Indicates AC (Alternating Current).
Symbols for various standards
Indicates the Waste Electrical and Electronic Equipment Directive (WEEE
Directive) in EU member states.
Indicates that the instrument conforms to regulations set out by the EC Directive.
Accuracy
We dene measurement tolerances in terms of f.s. (full scale), rdg. (reading), and
dgt. (digit) values, with the following meanings:
f.s. (Maximum display value, scale length) The maximum display value or the full length of the scale. This is usually the
maximum value of the currently selected range.
rdg. (Reading or displayed value) The value currently being measured and indicated on the measuring
instrument.
dgt. (Resolution) The smallest displayable unit on a digital measuring instrument, i.e., the input
value that causes the digital display to show a “1” as the least-signicant digit.
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Safety Notes
Measurement categories
To ensure safe operation of measuring instruments, IEC 61010 establishes safety
standards for various electrical environments, categorized as CAT II to CAT IV, and
called measurement categories.
DANGER
•Using a measuring instrument in an environment designated with
a higher-numbered category than that for which the instrument
is rated could result in a severe accident, and must be carefully
avoided.
•Using a measuring instrument without categories in an environment
designated with the CAT II to CAT IV category could result in a
severe accident, and must be carefully avoided.
CAT II: When directly measuring the electrical outlet receptacles of the primary
electrical circuits in equipment connected to an AC electrical outlet by a
power cord (portable tools, household appliances, etc.)
CAT III: When measuring the primary electrical circuits of heavy equipment (xed
installations) connected directly to the distribution panel, and feeders from
the distribution panel to outlets
CAT IV: When measuring the circuit from the service drop to the service entrance,
and to the power meter and primary overcurrent protection device
(distribution panel)
T Outlet
CAT II
Internal
wiring
Distribution panel
Service entrance
Service drop
CAT IV
Power meter
CAT III
Fixed installation

7
Usage Notes
Usage Notes
Follow these precautions to ensure safe operation and to obtain the full benets of
the various functions.
Preliminary checks
DANGER
If the probe or the instrument is damaged, there is a risk of electric
shock. Before using the instrument, perform the following inspection.
•Before using the instrument, check that the coating of the probes
are neither ripped nor torn and that no metal parts are exposed.
Using the instrument under such conditions could result in electric
shock. Replace the probes with those specied by our company.
•Before using the instrument the rst time, verify that it operates
normally to ensure that no damage occurred during storage or
shipping. If you nd any damage, contact your authorized Hioki
distributor or reseller.
Installation
Installing the instrument in inappropriate locations may cause a malfunction of
instrument or may give rise to an accident. Avoid the following locations.
For details on the operating temperature and humidity, refer to the specications.
(p. 151)
CAUTION
•Exposed to direct sunlight or high temperature
•Exposed to corrosive or combustible gases
•Exposed to water, oil, chemicals, or solvents
•Exposed to high humidity or condensation
•Exposed to high quantities of dust particles
•Susceptible to vibration
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Usage Notes
Installation precaution
CAUTION
Do not position the instrument on an unstable table or inclined surface. If
the instrument falls or tips, a malfunction of the instrument or injury may be
caused.
Handling the instrument
DANGER
To avoid electric shock, do not remove the instrument's case. The
internal components carry high voltage and high temperature.
WARNING
Customers are not allowed to modify, disassemble, or repair the
instrument. Doing so may cause re, electric shock, or injury.
CAUTION
•To avoid damage to the instrument, protect it from vibrations and physical
shock when transporting and handling. Be especially careful to avoid
physical shock from dropping.
•To avoid damage to the instrument, do not apply voltage or current to
EXT.SW terminal, analog output terminal, or maintenance terminal.
This instrument may cause interference if used in residential areas. Such use must
be avoided unless the user takes special measures to reduce electromagnetic
emissions to prevent interference to the reception of radio and television
broadcasts.

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Usage Notes
Handling the cords and leads
DANGER
To avoid electric shock, be careful to avoid shorting live lines with the
test leads.
WARNING
Before using the instrument, check that the coating of the cords are
not either ripped or torn and that no metal parts are exposed. If any
damage is found, contact your authorized Hioki distributor or reseller
to prevent electric shock.
CAUTION
•To avoid damage to the instrument, do not short connectors or output
components or input voltage.
•To avoid damage to the instrument, do not apply voltage or current to the
analog output terminal or EXT.SW terminal.
•Avoid stepping on or pinching the cables, which could damage the cable
insulation.
•To avoid breaking cables or lead wires, do not bend or pull them at the
base.
•Bare conductors could be exposed if the insulation melts. Do not touch
the heat sources.
To avoid electric shock and damage to the instrument, observe the cautions
listed below when connecting the analog output terminal, RS-232C
connector, and EXT.I/O terminal.
•Always turn off the power on the instrument and on any devices to be
connected before making connections.
•Be careful to avoid exceeding the rating of the analog output terminal,
RS-232C connector, or EXT.I/O terminal signal.
•During operation, a wire becoming dislocated and contacting another
conductive object can cause serious hazard. Use screws to secure the
external connectors.
•Properly isolate the devices and equipment to which the analog output
terminal, RS-232C connector, and EXT.I/O terminal are connected.
•To avoid damaging the cord, grasp the plug, not the cord, when
unplugging the output connector.
•The cables can become hard in the environment at a temperature of 0°C
or lower. When the cables are bent or pulled, the coating of the cables
may become damaged or may break.
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Usage Notes
IMPORTANT
When using the instrument, be sure to use the connecting lead wires, etc.
specied by our company. When other cords and lead wires are used, accurate
measurement may not be possible because the connection becomes poor, etc.
Before connecting the power cord
WARNING
•To avoid electric shock and to maintain the safety specications
of this instrument, connect the power cord provided only to a
3-contact (two-conductor + ground) outlet.
•Use only the designated power cord with this instrument. Use of
other power cords may cause re.
CAUTION
To avoid damaging the power cord, grasp the plug, not the cord, when
unplugging it from the power outlet.
IMPORTANT
Turn off the power before disconnecting the power cord.
Before connecting measurement leads
DANGER
To avoid electric shock and short circuit accidents, turn off all power
of the measurement target before connecting measurement leads.
WARNING
To avoid electrical accidents, use the designated wires or ones with more
than enough dielectric strength and current capacity.
UL1032 AWG18
Twisted wires 75 wires × φ0.12 mm

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Usage Notes
Before connecting switched probes
CAUTION
To avoid damage to the probes, do not bend or pull the probe base.
To ensure safe operation, use only the probes specied by our company.
Residual risk
WARNING
The test leads generate high voltage. To avoid electric shock, do not
touch the metal ends of the test leads.
CAUTION
The ends of the probes are sharp. Be careful to avoid injury.
Before connecting data cables
WARNING
•Failure to fasten the connectors properly may result in sub-
specication performance or damage to the equipment.
•Always turn off both devices when connecting and disconnecting
an interface connector. Otherwise, an electric shock accident may
occur.
Before switching between current sink (NPN) and current source (PNP)
CAUTION
Do not operate the EXT.I/O mode switch (NPN/PNP) while the instrument is
on.
Congure the NPN/PNP setting to accommodate externally connected
equipment.
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Usage Notes
Before connecting EXT.I/O
WARNING
•External power cannot be supplied to the instrument’s EXT.I/O
connector. Do not apply external power. (The ISO_5V pin of the EXT.
I/O connector is a 5 V (NPN)/-5 V (PNP) power output.)
To avoid electric shock or damage to the equipment, always observe
the following precautions when connecting to the EXT.I/O connector.
•Always turn off the main power switch on the instrument and on any
devices to be connected before making connections.
•Be careful to avoid exceeding the ratings of external terminals.
(p. 159) During operation, a wire becoming dislocated and
contacting another conductive object can cause serious hazard.
Use screws to secure the external connectors.
CAUTION
To avoid damage to the instrument, observe the following cautions:
•Do not short circuit ISO_5V and ISO_COM.
•When connecting the relay coil to the EXT.I/O output terminal, be sure to
install diodes to absorb current-electromotive force.
Before turning the power on
WARNING
•While insulation resistance is being measured or the START key is
pressed, hazardous voltage may be generated in the measurement
terminal. To avoid electric shock, do not touch the measurement
leads.
•Before turning the instrument on, make sure that the supply voltage
matches that indicated on its power connector. Connection to an
improper supply voltage may damage the instrument and present
electrical hazard.
CAUTION
•Avoid using an uninterruptible power supply (UPS) or DC/AC inverter with
rectangular wave or pseudo-sine-wave output to power the instrument.
Doing so may damage the instrument.