5 DETERMINATION OF CAPACITY WITHIN AN APPLICATION ........................................ 17
5.1LEAK AG E CAPACITANCE IN A CONNECTED NETWORK .......................................................... 17
5.2LEAK AG E CAPACITANCE IN A DISCONNECTED NETWORK ..................................................... 18
5.3LEAKAGE CAPACITANCE USING THE SIM-QMKII FAULT FINDING FUNCTION ........................ 18
DEIF A/S Page 2 of 18
Page 3
SIM-Q MKII Installation/operation instructions
1 General information
1.1 Warnings, legal information and safety
1.1.1 Warnings and notes
Throughout this docum ent, a num ber of warnings and notes with he lpful user i nfor m ation will be
presented. To ensure that these are noticed, they will be highlighted as follows in order to
separate them from the general text.
Warnings
Warnings indicate a potentially dangerous situation, which could result in death,
personal injury or damaged equipment, if certain guidelines are not followed.
Notes
Notes provide general information, which will be helpful for the reader to bear in mind.
1.1.2 Legal information and disclaimer
DEIF takes no responsibility for installation or operation of the product. If there is any doubt about
how to install or operate the product, please contact DEIF.
The unit is not to be opened by unauthorised personnel. If opened anyway, the warranty
will be lost.
Disclaimer
DEIF A/S reserves the right to change any of the contents of this document without prior notice.
The English version of this document always contains the most recent and up-to-date information
about the product. DEIF does not take responsibility for the accuracy of translations, and
translations might not be updated at the same time as the English document. If there is a
discrepancy, the English version prevails.
1.1.3 Safety issues
Installing and operating the unit may imply work with dangerous currents and voltages. Therefore,
the installation should only be carried out by authorised personnel who understand the risks
involved in working with live electrical equipment.
Be aware of the hazardous live currents and voltages. Do not touch any AC
measurement inputs as this could lead to i njury or death.
1.1.4 Electrostatic discharge a wareness
Sufficient care must be taken to protect the terminal against static discharges during the
installation. Once the unit is installed and connected, these precautions are no longer necessary.
1.1.5 Factory settings
The product is del ivered from factory with certain f actory settings. T hese are bas ed on average
values and are not necessarily the correct settings for the product. Precautions must be taken to
check the settings before running the product.
DEIF A/S Page 3 of 18
Page 4
SIM-Q MKII Installation/operation instructions
1.2 About the installation instructions
1.2.1 General purpose
The general purpose of this document is to gi ve the user important i nf ormation to be used in th e
installation of the unit.
Make sure to read this document before starting to work with the unit. Failure to do this
could result in human i njury or damage to the equipment.
1.2.2 Intended users
These Installation Instr uctions are mainl y intended for the oper ator and the person res ponsible
for the design and install ation. In most cases, this would be a pa nel builder desi gner. Naturall y,
other users might also find useful information in the document.
1.2.3 Contents and overall structure
This document is divid ed into chapters, and i n order to make the str ucture simple and eas y to
use, each chapter will begin from the top of a new page.
DEIF A/S Page 4 of 18
Page 5
SIM-Q MKII Installation/operation instructions
2 Description
2.1 G ener al description of SIM-Q MKII
The SIM-Q MKII is intende d for insulation monitor ing on a single-phas e or a 3-phase IT po wer
system with or without ne utral. The specia l characteristic of an IT power system is the fac t that
no live conductor is connected directly to earth. The SIM-Q MKII is connected to the power system
by connecting the term inal m arked P to one of the phases (or the neutr al). The FE in put is the n
connected to the safety cable. To be able to m onitor an y kind of insu lation failur e, all acces sible
conductive building structures must be connected to the cable marked FE (functional earth).
DEIF A/S Page 5 of 18
Page 6
SIM-Q MKII Installation/operation instructions
3 Installation
3.1 Connection
If a test function is wanted, an arrangement based on a resistor and a push-button can be
mounted as illustrated in the dr awings b elow. The value of the resist or can be a ny value from 0
Ω to the max. allowed insulation value. The SIM-Q MKII can be supplied from the IT system under
supervision, but it can also be supplied from another source, for example a 24 V DC source; see
the label for supply information.
The following functions can be selected by means of the switch that is available at the front of the
SIM-Q MKII: Monitoring, fault finding and test.
3-phase, AC 1-phase, AC
1-phase, DC
Recommended fuse size: max 2 A.
With the switch in m onitoring mode, the SIM-Q MKII will run a fast measur ing mode the firs t 15
seconds after a power-up. This mode can be used to perform a switchboard test. When a known
resistor is connected for testing, the auxiliary supply is disconnected and reconnected at the same
time (not shown in the illustration) . The response t ime for m easuring the known r esistor will b e
approximately 6 seconds. The two red LEDs will be ill uminated, bu t the rela y contact will not be
activated. After 15 seconds, the SIM-Q MKII automatically changes to normal monitoring mode.
As an alternative, the test c an be carried out in fault f inding mode. The res ponse time will be 1
second, and if the set point is exc eeded the rela y outp ut will be act ivate d. If t he switch is moved
to the “Test” position, an inter nal function test of the SIM-Q MKII is carried out. The r eading on
the scale during the test is 0 Ω, and the relay output is activated.
DEIF A/S Page 6 of 18
Page 7
SIM-Q MKII Installation/operation instructions
Type: 80 to 152 V AC
Type: 176 to 288 V AC
Type: 320 to 576 V AC
X1, X2: 100 V AC ±20 %
X1, X2: 220 V AC ±20 %
X1, X2: 400 V AC ±20 %
X1, X3: 110 V AC ±20 %
X1, X3: 230 V AC ±20 %
X1, X3: 450 V AC ±20 %
X1, X4: 127 V AC ±20 %
X1, X4: 240 V AC ±20 %
X1, X4: 480 V AC ±20 %
3.1.1 Connection of AC auxiliary supply
Label for AC version
DEIF A/S Page 7 of 18
Page 8
SIM-Q MKII Installation/operation instructions
Type: 18 to 30 V DC
X1: - 0 V DC Zero
X2: + 24 V DC ±25 %
3.1.2 Connection of DC auxiliary supply
Label for DC version
3.2 Dimensions
DEIF A/S Page 8 of 18
Page 9
SIM-Q MKII Installation/operation instructions
Note: On SIM-Q MKII
Example:
3.3 Changing t he default settings
The SIM-Q MKII can be re configured by means of four j umpers. (The original configurat ion is
marked on the label). The j umpers are placed on the PCB behind t he rear cover , under the s et
point potentiometer. See the drawing below for clarification.
with LF option, S1
must always be in the
2000 μF position!
DIP#1 = STANDARD/CUSTOM
DIP#2 = 500 μF/2000 μF
DIP#3 = 0 to 1 MΩ/0 to 10 MΩ
DIP#4 = ND/NE
DIP#1 can be set to O FF (STANDARD), an d the SIM-Q MKII will load its se ttings from a hard-
coded memory area. If it is set to ON (CU STOM), the SIM-Q M KII will load its set tings from a
configurable memory area that is used for custom settings and is set up b y DEIF upon ordering.
DIP#2 can be set to either OFF (500 μF) or ON (2000 μF). The chosen setting will determine the
maximum leakage capacitance. Note that this will also change the measuring time. See the
chapter “Calculation of capacity within an application” for determination of the needed max.
capacity setting.
DIP#3 can be configured to OFF (measuring range 0 to 1 MΩ) with 22 kΩ on the scale centre, or
it can be set to ON (measuring ran ge 0 to 1 0 MΩ) with 220 kΩ on the sc ale c entre. Notice that a
change in measuring range also involves a change of scale.
DIP#4 settings will determine the SIM-Q MKII rela y output. If it is set t o OFF (N D), the out put is
configured as a normally de-energised contact. If it is set to ON (NE), the output is configured as
a normally energised contact.
Use electrostatic discharge protection!
Sufficient care must be taken to protect the PCB against static discharges during the
configuration. Once the unit is installed and connected, these precautions are no longer
necessary.
DEIF A/S Page 9 of 18
• Standard is selected (all jumpers are active).
• Max. 500 μF leakage capacitor is selected.
• 1 MΩ is selected as measuring range.
• ND is selected as relay function.
Page 10
SIM-Q MKII Installation/operation instructions
1114020xxxA
3.4 Confi gur ati on of the measuring range
The SIM-Q MKII can be configured for measuring range 1 MΩ to 0 MΩ (1000 to 0 kΩ) with 22 kΩ
on the scale centre, or for 10 MΩ to 0 MΩ with 220 kΩ on the scale centre. T he figure above
shows the position of the switch f or selection of either 1 MΩ or 10 MΩ m easurin g range. Notice
that a change of measuring range also involves a change of scale. Change of scale can be done
by following the instructions below.
Figure 2
• Interrupt signal/supply to the terminals before you exchange the scale.
• Push the scale cover towards the rear edge.
• Remove the scale by means of a screwdriver or the like.
• Insert the new scale and press gently till it snaps into place.
• Push the scale cover back again; after this the unit is ready for mounting.
3.5 Adjustment of the set point
The warning set point is adjusted on the rear of the
housing by means of a s cr ewdriver , see t he f igur e
to the right. Also in test mode, the actual set point
is shown on the meter , and it can be rec onfigur ed
on the rear of the housing. When you power up the
product, the first 10 seco nds (def ault) are used to
show the actual s et point that is configured o n t he
meter.
Two ranges available:
13 kΩ to 200 kΩ or 40 kΩ to 1.5 MΩ.
See example on the label to the right.
Typical setting:
Insulation resistance cor responding to position of the red marking pointer or lower limit of the
section marked with red o n the instrum ent sc ale. Typicall y, the insulation alarm lim it is 1 kΩ per
volt. For example, 400 V system voltage could have an alarm limit of 0.4 MΩ.
If needed, the precise set point can be pre-set in the product from DEIF before delivery (fixed set
point). See data sheet, section "Order specifications".
If you want precise alarm settings, a known resistor corresponding to the red section on the
instrument scale must be connected between P and PE. Then adjust the potentiometer until alarm
is transmitted. For fast response, set the switch on the front in the fault-finding position.
DEIF A/S Page 10 of 18
Page 11
SIM-Q MKII Installation/operation instructions
3.6 Fuse
Recommended fuse for auxiliary supply X2, X3, X4 is max. 2 A.
3.7 WARNING - Megger test during commissioning
If the installation is to be tested by means of a high-voltage "MEGGER", the SIM-Q MKII must be
disconnected at terminal "p " before testing is carrie d out. Ignoring this m ay result in damage to
the SIM-Q MKII if the test v oltage is hig her than 10 00 V AC/DC. Besid es, the insulation test will
be affected by the built-in DC voltage generator im pedanc e (ap prox imately 250 kΩ).
DEIF A/S Page 11 of 18
Page 12
SIM-Q MKII Installation/operation instructions
Power
Status
AAL mode: Measurement is not steady.
DIM mode: Last measurement failed.
Warning
Measured insulation resistance is higher than set
point.
Measured insulation resistance is lower than set
mode during power-up).
Short flash
(25 %, 500 mHz)
Measured insulation resistance is higher than set
point but relay is still active. (OFF delay).
Measured insulation resistance is lower than set
point and relay is activated.
4 Operation
4.1 LED indi cators
The SIM-Q MKII is equipped with three LED indicators: two green LEDs and one yellow LED
placed as the lowest one. The LED colours are as described in the table below:
Top LED
OFF
ON
MCU not yet initialised, or no power.
Power on product and MCU has initialised.
Power-up sequence.
No valid measurement.
Valid measurement.
Middle LED
Flashing
OFF
ON
Flashing
Bottom LED
OFF
Long flash
(75 %, 500 mHz)
point but relay is not active. (ON delay). (AAL
ON
The next paragraphs explain more about LEDs in combination with the meter and switch
positions.
DEIF A/S Page 12 of 18
Page 13
SIM-Q MKII Installation/operation instructions
Start-up monitoring mode
Power LED is flashing
Start-up monitoring mode
Power LED is flashing
Start-up monitoring mode
Power LED is on
Change from other mode
Power LED is on
Valid measurement
Power LED is on
Valid measurement
Power LED is on
Measurement failed
Power LED is on
Relay is set according to last valid measurement
4.1.1 Normal mode
Fast measurement
(Fast mode measurement)
Show set point
DIM-Q measurement
to monitoring mode
Warning LED is set according to insulation
resistance and set point
Stat us LED is flashing (1 Hz 50 % duty cycle)
Meter shows the measured resistance in fast mode
Relay is deactivated independently of the measured
insulation resistance
“Power-up fast mode” is programmable in the range
0 to 30 s. Default = 0 s
Warning LED is off
Stat us LED is flashing (0.5 Hz 50 % duty cycle)
Meter shows the set point
Relay is deactivated
“Power-up set point” is programmable in the range 0
to 30 s. Default = 15 s
Status LED is flashing
Warning LED is off
Meter is at unlimited insulation resistance
Relay is deactivated
Status LED is flashing
Warning LED is off
Meter is at unlimited insulation resistance
Relay is deactivated
Insulation resistance is
higher than set point
Insulation resistance is
lower than set point
Resistance drop
Resistance jump
Fail to converge, max.
measurement time
DC error
Status LED is on => valid measurement
Warning LED is off => no insulation error
Meter shows the measured insulation resistance
Relay is deactivated
Status LED is on => valid measurement
Warning LED is on => insulation error
Meter shows the measured insulation resistance
Relay is activated
Stat us LED is fl ashi ng (1 flash 3 breaks) =>
resistance drop
Stat us LED is flashi ng (2 flashes 2 breaks) =>
resistance jump
Stat us LED is flashi ng (2 Hz, 50 % duty cycle) =>
fail to converge, max. measurement time
Status LED is flashing (3 flashes 1 break) => DC
error measurement
Warning is set according to last valid measurement
Meter shows last valid measurement
DEIF A/S Page 13 of 18
Page 14
SIM-Q MKII Installation/operation instructions
Power up in fault finding mode
Power LED is flashing
Change from other state to fault
Power LED is on
Measured insulation resistance is
Power LED is on
Measured insulation resistance is
Status LED is on => valid data
Measured insulation resistance is
Power LED is on
Measured insulation resistance is
Power LED is on
4.1.2 Fast mode
Show set point
finding mode
lower than set point and input is
steady
higher than set point and input is
steady
Status LED is flashing (0.5 Hz 50 %
duty cycle)
Meter shows the set point
Relay is deactivated
Warning LED is off
“Power-up set point” is programmable
in the range 0 to 30 s. Default = 15 s
Status LED is flashing
Warning LED is off => no insulation
error
Meter shows unlimited insulation
resistance
Relay is deactivated
Status LED is on => valid data
Warning LED is on => insulation error
Meter shows the measured insulation
resistance
Relay is activated
Warning LED is off => no insulation
error
Meter shows the measured insulation
resistance
Relay is deactivated
higher than set point but is not
steady
Insulation resistance is changed more
than 1 %/min.
lower than set point but is not
steady
Insulation resistance is changed more
than 1 %/min.
Status LED is flashing => resistance is
not steady. The more constant the
light, the closer to a valid result
Warning LED is off => no insulation
error
Meter shows the measured insulation
resistance
Relay is deactivated
Status LED is flashing => resistance is
not steady. The more constant the
light, the closer to a valid result
Warning LED is on => insulation error
Meter shows the measured insulation
resistance
Relay is activated
DEIF A/S Page 14 of 18
Page 15
SIM-Q MKII Installation/operation instructions
Test mode
Power LED is on
4.1.3 Test mode
Status LED is on
Warning LED is on
Meter shows insulation resistance set
point
Relay is activated
4.2 Response time graphs
The response time of the SIM-Q MKII is dependent on several different factors such as
configuration, settings, capacity in the system and, of course, the resistance itself. The total
response time is op posite proportional with the capacit y and the resistance . This means that if
great capacitance and insulation resistance is present in the application, there will be a long
measuring time before the cycle is finished. If the capacity or the resistance gets smaller, the SIM-
Q MKII will reduce the response time.
To comply with IEC 61557-8, the response time must be lower than 30 minutes, which is marked
as the blue area in the graph below.
Outside the blue area, the product will s till perform but it will not meet the 30 minutes res ponse
time limit stated in IEC 61557-8.
So, when you select a set point (Ran) in systems with 2000 µ F s ett in g, be a w are of the resulting
response time.
DEIF A/S Page 15 of 18
Page 16
SIM-Q MKII Installation/operation instructions
Graph above: There are no restrictions when you select set point (Ran) in 500 µF settings.
Graph above: Beware of response time when you select set point (Ran) in 2000 µF settings.
If the installation contains frequency converters that wor k below 20 Hz, the SIM-Q MKII with option
LF should be used instead, as it provides reliable measurements down to 5 Hz.
4.3 Technical specifi cati ons
See the data sheet, document no. 4921230028.
DEIF A/S Page 16 of 18
Page 17
SIM-Q MKII Installation/operation instructions
5 Determination of capacity within an application
5.1 Leakage capacitance in a connected network
Measuring of the leakage capacitance in a connected network using a voltmeter and an ammeter
(SL = PE).
Single phase:
CE = A/(V × 2 × phi × f). Phi is 3.14 and f is the frequency in Hz.
3 phases:
CE = A/(V × √3 × 2 × phi × f).
Example for a 3-phase system:
The current is measured to 30 A and the voltage is measured to 400 V:
CE = 30 A/400 V × √3 × 2 × 3.14 × 50 Hz = 137 μF per phase, total CE is 3 × 137 μF = 411μF.
For a 4-wire network, the CE total = CE × 4.
DEIF A/S Page 17 of 18
Page 18
SIM-Q MKII Installation/operation instructions
5.2 Leakage capacitance in a disconnected network
Measuring of the l eakage capacitance in a d is c onnected network us ing a mA meter, a voltmeter
and an AC source with a known frequency.
CE total = mA/(V × 2 × phi × f). Phi = 3.14 and f is the frequency in Hz.
In the example below, the mA is measured to 100 mA and the voltage from the AC sour ce is
measured to 50 V AC:
CE total = 0.1 A/50 V × 2 × 3.14 × 50) = 6.3 μF.
5.3 Leakage capacitance using the SIM-Q MKII fault finding function
The fault-finding functio n of the SIM-Q MKII c an be used to estim ate the size of the leakage
capacitor. Notice that this method can only be used when no insulation error is present.
Set the switch in fault finding position.
Discharge the leakage capacitor by short-circuiting P and PE by means of a low impedance load,
for example a bulb suitable for the AC voltage level on the system.
Open the short circuit between P and PE. Then measure the time (t) that elapses until the
instrument indicates approximately 0.5 (0.05) MΩ on the scale.
By using the formula C = t/0.3, the approximate leakage capacitor in μF can be calculated.
Example: t = 10 seconds, C = 33 μF.
DEIF A/S Page 18 of 18
Loading...
+ hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.