L1
L2
L3
K L
K L
K L
K L
K L
K L
1
2
91 92 93
L1 L2 L3
95
130BB510.11
Figure 2.10 External CT Wiring
The filter supports all standard CTs with 1 A or 5 A
secondary rating. CTs should have an accuracy of 0.5% or
better to reassure sufficient accuracy.
130BP094.10
0.0%
300-21 CT Secondary
Rating
[1] 5A
0.00
1 (1)
300-2*
CT Settings
Figure 2.11 CT Secondary Rating
2.5.3 Control Wiring Input/Output
The active filter allows external control signals for either
input control to the filter or to receive feedback from the
filter. Control wiring to the active filter, depending on type,
can connect to the following.
•
FC control board
•
AFC
•
CT input terminal
•
Power card
The active filter supports the following.
•
3 inputs (terminal 18, 19, 20)
•
2 programmable in/output (terminal 27, 29)
External control signals are all wired to the FCA terminal
MK102.
Digital inputs and outputs
Digital signals are a simple binary 0 or 1 which, in effect,
act as a switch. Digital signals are controlled by a 0 to 24 V
DC signal. A voltage signal lower than 5 V DC is a logic 0
(open). A voltage higher than 10 V DC is a logic 1 (closed).
Digital inputs to the filter are switched commands such as
start, stop, and reset.
•
Digital inputs to connection MK102 (18, 19, 20, 27
and/or 29) can be programmed for external start,
stop and/or reset of the unit or to receive an
external signal for filter sleep mode.
•
(For the LHD units, terminals 18 and 20 are wired
to the drive terminal 29 and 20 to allow the drive
to start and stop the filter when drive goes into
standby or off modes. The LHD filter should be in
Hand On (local) mode for proper operation.
•
Digital input terminal 32 and 33 are pre-wired
and configured for feedback from the Line power
contactor (CBL28). These are not for external use
and cannot be reconfigured.
•
Digital output signals on terminal 27 and 29 can
be used for external THDi or THDv readout to an
external controller or system. To allow for this
option, pulse reference signals need to be
programmed for terminals 27 and 29.
•
Terminals 12 and 13 provide 24 V DC low voltage
power, often used to supply power to the digital
input terminals (18-33).
•
The terminal 37 safe stop function can be used to
stop the filter in emergency stop situations. In
the normal operating mode when safe stop is not
required, the regular stop function is used. Use of
safe stop on terminal 37 requires that the user
satisfies all provisions for safety including relevant
laws, regulations and guidelines.
2.5.4 Serial Communication Wiring
Serial communication to the filter can be supported
through different terminals.
•
RS-485/EIA-485 terminal
•
USB connector
•
MK103 termination
•
Optional add-on communication protocol
connections
Operator Interface and Acti...
VLT Advanced Active Filter AAF006 D and E Frames Service Manual
MG90Z122 - VLT
®
is a registered Danfoss trademark
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