CG Drives & Automation 01-7318-01r1 Options 155
13. Options
13.1 Supply voltage
measurement board
(SVMB)
The Voltage measurement board monitors the grid voltage
and provides useful information to the frontend. This
option can improve the starting of the active frontend and
allows the AFR/VFXR/FDUL to withstand the momentary
dips in the supply voltage. The voltage measurement board
can also be useful for synchronizing the AFE to the grid
during the case when VSI is loaded. Without this board
there can be problems in synchronizing to the grid if VSI is
heavily loaded.
SVMB ver.2 is mandatory for AFG (grid code) functionality.
13.2 Liquid cooling
AC drive modules in frame sizes E - O and F69 - T69 are
available in a liquid cooled version. These units are designed
for connection to a liquid cooling system, normally a heat
exchanger of liquid-liquid or liquid-air type. Heat exchanger
is not part of the liquid cooling option.
Drive units with parallel power modules (frame size
G - T69) are delivered with a dividing unit for connection of
the cooling liquid. The drive units are equipped with rubber
hoses with leak-proof quick couplings.
The Liquid cooling option is described in a separate manual.
13.3 I/O Board
Each I/O option board 2.0 provides three extra relay outputs
and three extra isolated digital inputs (24V). The I/O Board
works in combination with the Pump/Fan Control, but can
also be used as a separate option. Maximum 3 I/O boards
possible. This option is described in a separate manual.
13.4 Brake chopper
It is required to use brake resistor with AFR/AFG if AFR/
AFG will be used for a limited regeneration. In this case part
of the energy goes back to the grid and remaining part of the
energy burns across the brake resistor. The brake resistor
must be mounted outside the drive. The choice of the
resistor depends on the application switch-on duration and
duty-cycle. This option can not be after mounted..
The following formula can be used to define the power of
the connected brake resistor:
Where:
P
resistor
required power of brake resistor
Brake level V
DC
is the DC brake voltage level
(see Table 30)
Rmin minimum allowable brake resistor
(see Table 31 and Table 32
ED effective braking period. Defined as:
t
br
Active braking time at nominal braking
power during a 2 minute operation
cycle.
Maximum value of ED = 1, meaning continuous braking.
Part number Description
01-5178-00 Supply voltage measurement board ver.1
01-5178-50
Supply voltage measurement board ver.1
with coated board.
01-6681-00
Supply voltage measurement board ver.2
01-6681-50
Supply voltage measurement board ver.2
with coated board.
Part number Description
01-3876-01 I/O option board 2.0
WARNING!
The table gives the minimum values of the
brake resistors. Do not use resistors lower
than this value. The AC drive can trip or even
be damaged due to high braking currents.
Table 30
Supply voltage (V
AC
)
(set in menu [21B]
Brake level (V
DC
)
220–240 380
380–415 660
440–480 780
500–525 860
550–600 1000
660–690 1150
NOTE: This instruction manual provides help only if brake
resistor is to be mounted on AFR/AFG unit. Please
consult standard FDU/VFX instruction manual if brake
resistor is to be connected on VSI side of FDUL/VFXR/
FDUG/VFXG.
P
resistor
=
(Brake level V
DC
)
2
R
min
x ED
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