Specifications

PFCC
10 CVHE-SVN03D-EN
Rule 1
Simultaneously disconnect
capacitors and load from line power.
If the capacitors are not switched off-
line when the load is disconnected,
they continue to add capacitance to
the electrical distribution system. A
“leading” power factor—too much
capacitance—may eventually
develop. This overcorrection causes
poor voltage regulation, i.e., voltage
is high when the circuit is unloaded,
then drops as loads are added.
Rule 2
Size motor overload protection to
account for capacitor-supplied
current.
Overloads are typically set to
measure the total current drawn by
the motor. When PFCCs are used,
they become the source of part of
that current. If the current they
provide isn’t registered by the
overload protectors, potentially
damaging amperage can reach the
motor. The simplest way to ensure
that the overloads “see” all current
supplied to the motor is to position
the PFCCs upstream of the overloads
as shown in Figure 2.
If the capacitor connection points
are downstream of the overload
devices, route the PFCC leads
through the overloads as shown in
Figure 3. This assures that the
overloads register both line and
capacitor-supplied current.
Figure 2. PFCCs Installed Downstream of
Starter Contactor, Upstream of Overload
Figure 3. PFCC Wires Routed Through Overload Protectors
3-Phase
Capacitor
P
ower
C
ircuit
Motor Starter
Contactor
Overload
Protectors
Motor
1
2
3
Fuses
Enclosed
Capacitor
Unit
Fusible
Safety Switch
or
Suitable Breaker
3-Phase
Capacitor
P
ower
C
ircuit
Overload
Protectors
1
2
3
Enclosed
Capacitor
Unit
Fusible
Safety Switch
or
Suitable Breaker
Motor
Starter
Contactor
Motor
Fuses