Power Factor Correction Systems
Assembly instruction
Complete packages of power factor control
relays (STR-...)
STR - modules are available as follows: with 6 - and with 12 - step
power factor control relay. The module contains the power factor
control relay (RM 9606, EMR 1100 S or EMR 1100), the accom-
panying control terminal strip with control fuse and temperature
limiter as well as the pre-mounted relay cable.
The temperature limiter switches off the contactors at max. 70 °C
over the no-voltage release of the relay (note: the temperature li-
miter has to be set back manually after it has triggered).
The control terminal strip as well as the temperature limiter have to
be mounted on the predetermined position on the mounting plate
with the enclosed mounting material. The xing ange of the tem-
perature limiter has to be included in the safety precaution (this is
fullled when mounting has been done as recommended).
For extension units we have 12 - step control terminal strips
(without control fuse) with temperature limiter.
Important! When connecting extension units to a basic unit the
jumper of T 1 to T 2 of the control clamp (basic unit) has to be re-
moved. In case there is already an extension unit connected to the
basic unit, the jumper T 2 to T 3 of the control clamp (rst extensi-
on unit) has to be removed. Otherwise the temperature monitoring
function of the extension unit is not activated.
Choked power factor correction systems are additionally equipped
with a fan and a temperature controller. The temperature controller
should be mounted in the upper part of the switch board cabinet
and set to 30 °C.
Capacitor modules,
capacitor / reactor modules
The capacitor modules are equipped with low-loss power factor
correction capacitors (encased-single capacitors, switched as
batteries with discharge resistors, discharge on min. 75 V in 60 s),
contactors and a bus bar system with NH 00 - fuses. The capaci-
tor / reactor modules do additionally have a reactor connected in
series. The feeder is connected to the bus bar system, which is
bent rectangularly.
In case the feeder should be connected vertically, a bus con-
nection bracket set is needed. This set is available as accessory
equipment and has to be ordered separately (= CU AW - 1).
The cables of the contactor coil are led on one (1 - 3 steps) resp.
two (4 - 7 steps) 4 - pole plugs (pins).
The connection of the capacitor module with the control terminal
strip is made through a cable with the prefabricated plug (socket),
which is enclosed to the accessories of the modules.
By these connections or by parallel connection of the contactors
with jumpers at the plugs of the capacitor module, several contac-
tors can be switched at the same time. Therefore more capacitor
batteries can be interconnected. This is necessary in case of lar-
ger step power.
At the same step power the stepping is equivalent to the switching
sequence: 1:1:1... . In case further steps are twice as large as the
rst, the switching sequence would be: 1:2:2... .
The switching sequence 1:1:2... states, that the rst two steps
have , for example 25 kVAr and all further steps have 50 kVAr.
Power factor control relays detect these switching sequences au-
tomatically (can also be entered manually).
In case of manual set-up of the minimum operating current (c / k -
value) the minimum step power (= valance 1) and the transforma-
tion ratio of the transformer have to be taken into consideration.
When using a sum current transformer the sum of all currents of
the main transformers during the set-up of the c / k - value has to be
taken into consideration.
Set up of power factor correction systems
for main voltages > 400 V
In case it is planned to use modules resp. power factor correction
systems for a mains voltage of > 400 V, a control transformer with
the adequate power has to be xed for the control unit (contactors,
fans and possibly a power factor control relay).
The coils of the contactors are designed for a mains voltage of
230 V / 50 Hz and 240 V / 60 Hz!
As a back-up fuse for the control transformer a motor circuit brea-
ker instead of the neozed-fuses has to be used on the control
clamp (fuses are only approved up to 400 V!). Control transfor-
mers with a power of 800 VA and an input voltage up to 690 V are
available as accessory equipment.
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