frako RM 2106 User manual
RM 2106 / 2112
2
Figure 1 Front view
aDisplay for active capacitor stages
bDisplay for inductive or capacitive
operating status
cDigital displays
dLED indicates regenerative power
eDisplay for current or historical alarms
fLED lights up in setup mode
gLED lights up in manual mode
hMultifunctional button
(see operating instructions)
iSelection key for manual mode, setup
mode or automatic mode
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Figure 2 Rear view
jConnection for the current transformer
kOptional connector for improved
measurement of harmonic wave
lConnector for power supply to the
control relay
mConnectors for the control contacts that
switch the contactors. The shared pole
is connected to terminal ´L´.
nTypical connection
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Table of Contents
1 Introduction 9
1.1 How to use these operating
instructions 9
1.2 Scope of functions 9
2 Installation and connection 11
2.1 Installation 11
2.2 Voltage connection 11
2.3 Current transformer connection
12
2.4 ”Meas” measuring voltage
connection 12
2.5 Switching contacts 12
2.6 Alarm contact 13
2.7 Single phase connection 14
2.8 Extended connection 15
2.9 Connection with voltage
transformer 16
2.10 Connection in special cases 17
3 Start-up 19
3.1 Initial start-up 19
3.2 Subsequent start-up 20
3.3 Maintenance 21
4 Control relay setup 23
4.1 Target power factor setting -1- 25
4.2 Overcurrent switch off -2- 27
4.3 Switching contact as alarm
contact -3- 27
4.4 Automatic response current
identication -4- 28
4.5 Response current -5- 28
4.6 Relative value of the switch
outputs -6- 30
4.7 Service -7- 31
5 Functioning and operation 33
5.1 Automatic control mode 33
5.2 Displaying the total harmonic
distortion factor 33
5.3 Check System 33
5.4 Manual mode 34
6 Alarms and troubleshooting 35
6.1 Connection errors 35
6.1.1 E3 - No capacitors 35
6.1.2 E1 - Defect capacitor stages 35
6.1.3 E2 - Incorrect connection 35
6.1.4 I = 0 - No current in current path
36
6.2 Connection messages 36
6.2.1 A2 - Incorrect connection that
can be corrected internally 36
6.2.2 A1 - Relative value of the switch
output 36
6.3 Alarms in automatic control
operation 36
6.3.1 E4 - Harmonic overcurrent in the
capacitor 37
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Safety and Warning Notices.
Important !
Read this before commissioning !
■The operating instructions should be read carefully before the device is assembled,
installed and put into operation.
■Installation and commissioning should only be carried out by appropriate specialists in
accordance with existing regulations and provisions
■The operator must ensure that all operatives are familiar with these operating instructions
and proceed accordingly
■The device conducts mains voltage and should not be opened
■If the device is obviously damaged, it should not be installed, connected or commissioned
■If the device does not work after commissioning, it should be disconnected from the mains
again
■Any other laws, standards, guidelines, etc. regarding this product must be observed
The commissioning and safety information for the power factor correction system should
also be observed.
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Introduction 9
1 Introduction
The reactive power control relay RM 2112
and RM 2106 respectively is capable of
measuring the reactive power and active
power of the connected mains network.
Working in conjunction with a power factor
correction system, the device controls the
programmed target power factor by activating
or deactivating capacitors.
1.1 How to use these operating
instructions
Important:
It is essential that you read section 2 “Instal-
lation and connection” and section 3 „Start-
up“ before installing the control relay.
The functions of the control relay are also
described in brief in section 1.2 „Scope of
functions“.
The setting options for the control relay are
described in section 4 „Control relay setup”.
Section 5 „Functioning and operation“
explains how the control relay works and how
to operate it.
Section 6 „Alarms and troubleshooting“
describes alarms and error messages of the
control relay. Troubleshooting information is
also provided there.
1.2 Scope of functions
Below is a brief overview of the various
functions of the device:
■12 switching contacts at RM 2112 and
6 switching contacts at RM 2106
■Power factor display
■Total harmonic distortion factor display
(voltage thd)
■Semi-automatic connection detection
■Automatic detection of the capacitor stages
■Comprehensive connection analysis
■Patented characteristic avoiding over-
compensation for low active power
■Four-quadrant regulation
■Cyclic switching of all capacitor stages
of the same capacity
■Reactive power requirement-dependent
switching delay time
■Optional monitoring of the harmonic
overcurrent in the capacitor
■Deactivation at zero voltage or zero current
■Alarm signals for:
- failure to reach the target power factor
- overcurrent in the capacitor
- defects at capacitor stages
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Installation and connection 11
2 Installation and connection
The reactive power control relay RM 2112
and RM 2106 respectively can be connected
in a number of different ways. The main
connection methods are described below.
Important information:
The control relay should be disconnected
from the mains during installation.
2.1 Installation
The reactive power control relay is installed
from the front in a control panel space
measuring 138 x 138 mm and is xed in place
using the mounting screws of the front panel.
As accessories (protection kit; see section
8) insulated xing screws are available.
These can be used to install the control
relay into switchgear cabinets and cubicles
of protective class II. Also a sealing ring is
part of the protection kit, which must be used
when installing the control relay in switchgear
cabinets and cubicles of protection class IP 54.
The pre-assembled xing clamps ensure
speedy and secure assembly. The electrical
connection is created by means of plug-in
connectors which are also included in the
delivery.
2.2 Voltage connection
Reactive power control relay obtains its
voltage supply via terminals ”L” and ”N” (see
gure 2, item ’l’).
A phase conductor is to be connected to
terminal ”L” and neutral conductor to terminal
”N”. For advanced connection variations see
sections 2.7 to 2.10.
Important information:
The reactive power control relay is designed
for voltage supplies of up to 240 V AC.
The connections for the supply voltage are
to be fused externally with 4 A max.
In the case of mains networks that do not
facilitate voltage tapping in the 220 V AC
to 240 V AC range (either phase/phase or
phase/neutral), a voltage transformer must
be used for the power supply for the control
relay. (See section 2.9 )
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RM 2106 / 2112
12
2.3 Current transformer connection
Outputs S1 and S2 of the current transformer are
connected to terminals S1 and S2 (Figure 2, item
’j’) of the control relay. To keep the load of the
current transformer as low as possible, the feed
lines should have a adequate cross section.
It is permissible for connector S1 or S2 of the
current transformer to be grounded.
Caution:
The nominal current in the current transformer
path may not exceed 5 A.
Note:
After connection it is necessary to remove
the short-circuit jumper on the current
transformer, if present.
2.4 ”Meas” measuring voltage connection
This connection can be used to switch the
control relay to a different measuring procedure
for monitoring overcurrent (see section 2.8 ).
This terminal ”Meas” (Figure 2, item ’k’) is not
used in the standard connection.
Important information:
The nominal voltage between the ”Meas” and
”N” connectors may not exceed 240 V AC.
The voltage between the ”Meas” and ”L”
connectors may not exceed 420 V AC.
If ”Meas” is connected directly to a phase
conductor, then this is to be secured exter-
nally with a maximum of 4 A.
2.5 Switching contacts
The shared pole of all switching contacts
(Figure 2, item ’m’) is connected to terminal
”L” of the voltage supply.
Important information:
The outputs of the switching contacts do
not have oating potential.
When the switching contacts are switched, the
same voltage is applied as is used to supply
voltage to the control relay (connection ”L”).
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Installation and connection 13
The contactor relays of the capacitor stages
are operated (supplied) via the switching
contacts of the control relay.
2.6 Alarm contact
Switching contact 12 at RM 2112 (switching
contact 6 at RM 2106) can be used either as
a control output for a capacitor stage or as an
alarm contact. The relevant selection is made
in setup mode under -3-.
In the event of an alarm, switching contact 6
is closed.
It should be noted that, even when operating
as an alarm contact, this switching contact
continues to have potential binding to the
supply voltage of the control relay. If a oating
potential contact is required, use an additional
contactor relay.
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RM 2106 / 2112
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Figure 3 Single phase connection
2.7 Single phase connection
The connection diagram above shows the
same connection as the one printed on the
back of the control relay.
The voltage signal for power factor measurement
is received in parallel with the voltage supply.
The terminal ”Meas” is not in use.
In this connection variant, only the 5th, 7th,
11th and 13th harmonics of the voltage are
used to calculate the harmonic overcurrent in
the capacitor.
This connection variant can be chosen if the
above-mentioned harmonics are sufcient
for monitoring overcurrent or if overcurrent
monitoring has been completely switched off
(setup code -2-).(see section 4.2)
Current transformer and terminal ”L” should
be attached to the same phase conductor:
Either L1, L2 or L3.
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Installation and connection 15
Figure 4 Extended connection
2.8 Extended connection
This type of connection offers a more precise
measuring procedure for the overcurrent in
the capacitor.
In this case, the terminal ”Meas” is attached
to another phase conductor of the AC mains
network. The voltage signal for the internal
measurements is tapped between terminal
”L” and terminal ”Meas”.
Because the voltage signal is recorded between
two phase conductors to which the capacitors
are also connected, the dU/dt measuring
procedure can be used for calculating the
overcurrent.
This means that all frequencies up to the 31st
harmonic are taken into account calculating
harmonic overcurrent in the capacitor (see
also section 4.2).
The total harmonic distortion factor of the
voltage (thd) is also measured between the
phase conductors in this type of connection.
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RM 2106 / 2112
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Figure 5 Connection with voltage transformer
2.9 Connection with voltage transformer
The connection diagram above shows how
the control relay is connected together with a
control transformer.
Important information:
The control voltage of the transformer may
not exceed 240 V AC.
If the voltage signal is tapped by the control
transformer between two phase conductors,
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Installation and connection 17
connection must be as shown in the diagram.
The measuring procedure then is similar to
that for the extended connection (see section
2.8).
If the control transformer taps the voltage
signal between a phase conductor and
neutral, the terminal ”Meas” must remain
unused.
Figure 6 Connection in special cases
2.10 Connection in special cases
The type of connection shown above should
be used if the voltage between the phase
conductors does not exceed 240 V AC.
The following general principles apply:
If the terminal ”Meas” remains unused, the
voltage for terminals ”L” and ”N” must be
connected to a phase conductor and to the
neutral conductor.
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RM 2106 / 2112
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If the terminal ”Meas” is used, the voltage
for terminals ”Meas” and ”L” must be
connected each to a phase conductor.
For all types of connections (gure 3 to 6)
it is also possible to connect the current
transformer in phase conductors L2 or L3.
In this case, the voltage connections to the
phase conductors should be exchanged
accordingly.
If the control relay operates with automatic
response current recognition, connection
errors would be reported.
If response current recognition is deactivated,
then an error in the connection will lead
to functional errors during subsequent
operation.
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Start-up 19
3 Start-up
After installation has been carried out as
described in section 2, the control relay can
be started.
Important information:
Make sure that the connector terminals of
the control relay are no longer accessible
(e.g. by means of a locked door or a cover
hood).
3.1 Initial start-up
During initial start-up the control relay attempts
to determine the type of connection and the
size of the stages. After about 5 seconds, ”---”
appears on the display (gure 1, item ’c’). The
stages are switched on and off in succession.
This can take up to 15 minutes.
Important:
If the control relay does not behave as
described above, the device should be
switched off and the installation should be
checked.
It may be that the device has already been
used and behaves as described in section 3.2.
If the measuring process is not complete
after 15 minutes, then an error has probably
occurred.
Important information:
The device should always be switched off
before carrying out wiring or installation
activities.
(For help in troubleshooting see section 6).
Note:
The control relay needs to be connected
to at least one capacitor stage to switch in
order to determine the type of connection.
Make sure that both the control circuit and at
least one capacitor stage are fully functional.
It is also possible to abort the measuring
procedure by switching off the automatic
connection and responce current
identication. This takes place in setup mode
-4- and simultaneously requires the manual
programming of the stage parameters (see
section 4.4).
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RM 2106 / 2112
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After measurement the control relay indicates
the results it has determined on the display
(c).
Flashing messages that begin with E(e.g.
E2), indicate an error. Message ”I=0” also
indicates an error after initial start-up.
In such cases the entire control system is to be
switched off and the error must be eliminated.
(For troubleshooting see section 6.)
In some circumstances the control relay
displays the message ”A2” after identication
of the connection type. This means that there
are deviations from the types of connection
shown that do not restrict the control process.
This message is acknowledged automatically
after about 30 seconds or can be acknowledged
by pressing any key.
The control relay always displays ”A1”
after identication of the connection type. A
stage indicator (a) also ashes. The value
displayed alternately with ”A1” in the display
is the determined value for the indicated stage
(switching contact).
This message is acknowledged automatically
for each stage after about 15 seconds or can
be acknowledged earlier by pressing any key.
When all messages have been acknowledged,
the control relay begins the automatic
regulating process. The current power factor
appears on the display.
If the power factor displayed does not
correspond to the actual power factor, the
identication of the connection must be
repeated. This is activated by pressing
the ”Select” and ”Voltage THD” keys
simultaneously for at least 3 seconds (check
system).
3.2 Subsequent start-up
The control relay begins with its normal regulatory
program immediately after a power failure.
If the ”Select” and ”Voltage THD” keys are
pressed simultaneously for at least 3 seconds
(check system), then the control relay carries out
connection identication again. It then behaves
in the same way as in the initial start-up (see
section 3.1).
This requires that automatic connection
identication should be activated. ( setup mode
-4-; see section 4.4)
The programmed control parameters are
stored in a non-volatile memory and can be
altered as necessary. (see chapter 4)
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