Mitsubishi Electric VAR-6A User Manual page 6

Safety Precautions
●
Since this device is not equipped with protective functions against overcurrent
CAUTION
Discharging Resistor
Discharges residual charge when
the capacitor is disconnected.
Discharges down to 50 V or less in
5 minutes.
(DR-Discharging Resistor)
●
●
●
●
●
●
,
overvoltage ground faults
circuits must be prepared separately.
〈Example〉
VT
CT
Ⅰ＞
Wh
VMC
52C1
SR
DR
63C1
High Voltage
（SC） SC
Power Capacitor
（DR）
When a discharging coil (DC-Discharging
Coil) is used, residual charge will be
discharged down to 5 V or less in 5 seconds
when the capacitor is disconnected.
Ⅰ ＞
Overcurrent Relay
Ⅰ
Ground Relay
＞
Overvoltage Relay
U
63C Capacitor Pressure Switch
SR Series Reactor
DR Discharging Resistor
SC
High Voltage Power Capacitor
Install series reactor to the capacitor
by this device.
This device has a constant excitation system that outputs no voltage
that continuously keeps on when capacitor control signal is closed
contact becomes off when capacitor control signal is opened for each bank. One
side of the output signal of from C
7
output signal of from C to C
electromagnetic contactor for disconnection and connection of capacitor
sure to use auxiliary relay such as DC operated type (Model : SRD-T
operated type (Model : SR-T
The maximum current must be under
In case of using by balanced load
Circuits set as Manual ON or Manual OFF will not connect/disconnect capacitor.
When electric discharge coil is instituted
W
, ,
temperature or pressure on capacitor
Hz
Automatic Power Factor Controller
V
VT Secondary Side 110 V AC
COS
W A
CT Secondary Side 5 A AC
Auxiliary Power supply
110 V AC
DS
52C
Ⅰ＞
A
Ⅰ
3
Ground Relay
VMC VMC VMC
52C2 52C3 52C4
SR SR SR
DR DR DR
63C1 63C1 63C1
SC SC SC
＊Type Designations of devices
by the Present Maker
VMC...VZ-E TYPE
SC......KL-8 TYPE
（capacitor）
SR......KR-3 TYPE
（series reactor）
,
which is to be automatically controlled
1 6
to C is COM
12 2
is COM . When connecting with the vacuum
5
) manufactured by Mitsubishi Electric.
1 5
. A on a common terminals.
,
connect at the diagram.
,
set Delay Time for
6
,
protected
Connection Signal
VAR-6A
or
VAR-12A
50 Hz/60 Hz
＞
U
Capacitor
Control Circuit
Over-voltage Relay
Provides protection against
overvoltages on capacitors
since overvoltages will
shorten capacitor lifetimes
and lead to explosion of
capacitors in extreme cases.
Power Fuse
Provides protection against
overcurrent.
Vacuum Electromagnetic Contactor
Connects or disconnects
the capacitor
Pressure Switch
Detects the expansion
of capacitor case
Series Reactor (SR-Series Reactor)
・ Has 6 % of a capacitor
・ Impress transient phenomenon and
limits the fifth harmonic waves.
13 % series reactors are used when
voltage distortion exceeds 5.5 %.
The capacitor is protected by
tripping circuit breaker for 52C
or vacuum electromagnetic
contactor for 52C1 to 52C4 with
each protection relays and
disconnecting the capacitor from
the circuit.
1
a contact
,
while the
1
and the other side of the
,
be
5
) or AC
5
minutes.
,