Enclosure with corrosion-
resistant back channel
For additional protection from corrosion in
harsh environments, units can be ordered in
an enclosure that includes a stainless steel
back channel, heavier plated heat sinks and an
upgraded fan.
This option is recommended in salt-air environ-
ments, such as those near the ocean.
Mains shielding
Lexan® shielding can be mounted in front of
incoming power terminals and the input plate
to protect from accidental contact when the
enclosure door is open.
Space heaters
and thermostat
Mounted in the cabinet interior of drives with
enclosure sizes D and F and controlled via an
automatic thermostat, space heaters controlled
via an automatic thermostat prevent conden-
sation inside the enclosure.
The thermostat default settings turn on the
heaters at 10 °C (50 °F) and turn them off at
15.6 °C (60 °F).
Cabinet light with
power outlet
A light can be mounted on the cabinet interior
of drives with enclosure size F, to increase
visibility during servicing and maintenance.
The light housing includes a power outlet for
temporarily powering laptop computers or
other devices. Available in two voltages:
230 V, 50 Hz, 2.5 A, CE/ENEC
120 V, 60 Hz, 5 A, UL/cUL
RFI filters
VLT® Series drives feature integrated Class A2
RFI filters as standard. If additional levels of
RFI/EMC protection are required, they can be
obtained using optional Class A1 RFI filters,
which provide suppression of radio frequency
interference and electromagnetic radiation in
accordance with EN 55011.
On drives with enclosure size F, the Class A1
RFI filter requires the addition of the options
cabinet.
Marine-use RFI filters are also available.
Insulation Resistance
Monitor (IRM)
Monitors the insulation resistance in un-
grounded systems (IT systems in IEC terminol-
ogy) between the system phase conductors
and ground. There is an ohmic pre-warning
and a main alarm setpoint for the insulation
level. Associated with each setpoint is an SPDT
alarm relay for external use. Only one insulation
resistance monitor can be connected to each
ungrounded (IT) system.
Integrated into the drive’s Safe Torque
Off circuit
LCD display of insulation resistance
Fault memory
INFO, TEST and RESET key
Disconnect
A door-mounted handle allows for the manual
operation of a power disconnect switch to en-
able and disable power to the drive, increasing
safety during servicing. The disconnect is inter-
locked with the cabinet doors to prevent them
from being opened while power is still applied.
Circuit breakers
A circuit breaker can be remotely tripped, but
must be manually reset. Circuit breakers are
interlocked with the cabinet doors to prevent
them from being opened while power is still
applied. When a circuit breaker is ordered as an
option, fuses are also included for fast-acting
current overload protection of the AC drive.
Contactors
An electrically controlled contactor switch
allows for the remote enabling and disabling
of power to the drive. An auxiliary contact on
the contactor is monitored by the Pilz Safety
Module if the IEC Emergency Stop option is
ordered.
Manual motor starters
Provide 3-phase power for electric cooling
blowers that are often required for larger
motors. Power for the starters is provided from
the load side of any supplied contactor, circuit
breaker or disconnect switch. If a Class 1 RFI
filter option is ordered, the input side of the
RFI provides the power to the starter. Power is
fused before each motor starter and is off when
the incoming power to the drive is off. Up to
two starters are allowed. If a 30 A, fuse-protect-
ed circuit is ordered, then only one starter is
allowed. Starters are integrated into the drive’s
Safe Torque Off circuit.
Unit features include:
Operation switch (on/off)
Short circuit and overload protection with
test function
Manual reset function
30 A, fuse-protected
terminals
3-phase power matching incoming mains
voltage for powering auxiliary customer
equipment
Not available if two manual motor starters
are selected
Terminals are off when the incoming power
to the drive is off
Power for the fused-protected terminals will
be provided from the load side of any sup-
plied contactor, circuit breaker, or discon-
nect switch If a Class 1 RFI filter option is
ordered, the input side of the RFI provides
the power to the starter.
Residual Current Device
(RCD)
Uses the core balance method to monitor
ground fault currents in grounded and
high- resistance grounded systems (TN and
TT systems in IEC terminology). There is a
pre-warning (50% of main alarm setpoint) and
a main alarm setpoint. Associated with each
setpoint is an SPDT alarm relay for external
use. Requires an external “window-type”
current transformer (supplied and installed by
customer).
Integrated into the drive’s
Safe Torque Off circuit
IEC 60755 Type B device monitors, pulsed
DC, and pure DC ground fault currents
LED bar graph indicator of the ground fault
current level from 10-100% of the setpoint
Fault memory
TEST / RESET key
Safe Torque Off with
Pilz Safety Relay
Available for drives with enclosure size F.
Enables the Pilz Relay to fit in the enclosure
without requiring an options cabinet.
Emergency Stop with Pilz
Safety Relay
Includes a redundant 4-wire emergency stop
pushbutton mounted on the front of the
enclosure, and a Pilz relay that monitors it
in conjunction with the drive’s Safe Torque
Off circuit and contactor position. Requires a
contactor and the options cabinet for drives
with enclosure size F.
Brake Chopper (IGBTs)
Brake terminals with an IGBT brake chopper cir-
cuit allow for the connection of external brake
resistors. For detailed data on brake resistors
please see the VLT® Brake Resistor MCE 101
Design Guide, MG.90.Ox.yy, available at
http://drivesliterature.danfoss.com/
Regeneration terminals
Allow connection of regeneration units to
the DC bus on the capacitor bank side of the
DC-link reactors for regenerative braking. The
enclosure size F regeneration terminals are
sized for approximately 50% of the power
rating of the drive. Consult the factory for
regeneration power limits based on the
specific drive size and voltage.
Load sharing terminals
These terminals connect to the DC-bus on the
rectifier side of the DC-link reactor and allow
for the sharing of DC bus power between
multiple drives. For drives with enclosure
size F, the load sharing terminals are sized for
approximately 33% of the power rating of the
drive. Consult the factory for load sharing limits
based on the specific drive size and voltage.
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