ATV61 71 QUESTIONS
Q: Can ATV61/71 be used in a common DC bus installation?
A: Yes, Connection to the VSD DC bus is readily available.
Various protection precautions will be required depending on the application.
Q: What IP ratings are available for ATV61 and ATV71?
A: All drives are available as either IP20 wall mount, IP31 with
Frame Mount kit and conformity kit, or IP54. Customised IP54 solutions are also
available to meet specific customer requirements.
Q: Are ATV61
and ATV71 Flux Vector Drives?
A: Open Loop Flux Vector is the
standard operating mode for all ATV61 and ATV71 drives. This can be changed to
Closed Loop with the use of an encoder card and an encoder, or standard V/Hz
Q: What Communication Protocol options are available for
A: Standard protocols supplied are Modbus RTU and
Can-open. Additional protocols are available as low cost option cards that
simply click into place behind the operator face panel on the drive. Protocols
include: Fipio, Modbus/Unitelway, Ethernet TCP/IP, Modbus Plus, Profibus DP,
DeviceNet, INTERBUS. In addition, the following protocols are available for
ATV61: LONWorks, Metasys N2, Apogee FLN, BACnet.
Q: How the
voltage rise at the motor terminals be limited?
A: Voltage rise
is a function of the dV/dt (rate of voltage rise) at the VSD end as well as
cable length (transmission line theory). The ATV61/ATV71 range will limit the
dV/dt so that the voltage rise at the motor terminals will not exceed 2x DC bus
volts (= 1175V for a 415V system) If further limitation is required, motor
chokes (Output chokes) will limit dV/dt to 500V/microsecond.
Are there any restrictions on motor cable length?
capacitance will provide an additional loading on the VSD as high frequency
currents charge and discharge this capacitance along the cable length. The
longer the cable, the higher the load and nuisance tripping of the VSD can
occur. The use of motor output chokes (inductors) will significantly increase
cable length, however there are limitations. The use of a Sinusoidal output
filter will increase motor output cable length to 1000 metres, however
Sinusoidal filters should not be used with EMC cables. Motor Chokes and
Sinusoidal Filters are part of the standard accessory range for ATV61 and ATV71
Q: Can Harmonics be reduced?
A: there are
several solutions available to reduce or mitigate harmonic currents drawn from
the supply by VSDs, over and above the standard inclusions with ATV61 and ATV71.
This can take the form of Passive filters or Active Harmonic Filters which can
reduce THDi to less than 5%. Harmonic Filters are also available as a standard
Q: Can regenerated energy be absorbed by the incoming
A: With the use of a Network Braking Unit, any
regenerated energy from the motor (or motors in case of a common DC bus) can be
fed directly back into the incoming supply. Network Braking Units are available
as a standard product to match ATV71
Q: Can parameter settings be
transferred from one drive to another?
A: Yes, and there are
several ways to do this. Firstly, using the standard Operator panel which is
compatible on all ATV61 and ATV71 drives. This can store up to four (4)
parameter sets that can be uploaded from one drive and downloaded to another.
Another option is to use PowerSuite, which is a PC based programming software
that is available for setting (pre-programming), reading and loading parameters
to the entire Telemecanique Drives and Softstarter range. I It’s oscilloscope
function is an ideal tool for diagnostics and commissioning and adds further
functionality. Prameters can also be automatically downloaded to the drive
through the Faulty Device Replacement (FDR) function, available with ATV61 and
ATV71. This works in conjunction with a Schneider PLC and enables parameters to
be stored on the PLC via an Ethernet connection. Parameters are continually
monitored. Should a drive require replacement for maintenance purposes for any
reason, by setting the correct IP address on the replacement drive all
parameters are loaded directly into the new drive without the need for further
Q: Can the Operator panel be remote mounted?
A: Yes, we can provide a remote mount kit comprising a mounting
base and a connection cable. This is available as either IP54 and IP65.
Q: Is a dynamic braking switching module incorporated in
A: ATV61 up to 220kW and ATV71 up to 160kW all have
a dynamic brake transistor built into the drive to switch an external dynamic
brake resistor. For drives above this rating, an external dynamic braking unit
is required which is available as a standard product
Q: Is the DC
A: Yes, the Altivar 61/71 DC bus is readily
accessible via terminals and can be connected to incorporate dynamic braking
resistors or for common DC bus applications.
Q: What are the EMC
levels for the Altivar 61?
A: The Altivar 61/71 fully conforms to
IEC/EN 61800-3 as the applicable reference standard as well as C-Tick.
Additional EMC filters can be used where a higher category standard is required
(eg Class B EMC requirement)
Q: What is the Power Removal safety
function used for?
A: The Power Removal function prevents the
unintended start of a motor. This function inhibits the VSD output stage and
therefore cuts the power to the motor. Power Removal is only an operational
security and does not provide electrical isolation (no galvanic isolation). This
function conforms to the machine standard EN954-1 category 3 and to the
installation standard IEC/EN61508-1 SIL2. In addition, the safety function of
the Altivar 61/71 conforms to international standards relating to machine safety
(IEC62061), which is not necessarily the case for some competitors
Q: What is the difference between the ATV61/ATV71 reinforced and
A: All drives have a protective coating on all
PCB’s – Conformal coating is available as an option for drives up to 75kW – this
option makes the ATV61/71 a reinforced version. However for all drives above
75KW the product is reinforced in standard. The principal differences are that
in a reinforced drive we provide – The conformal coating of all the boards – The
tinning of the copper bars – The treatment of the plastics against the corrosive
nature of certain oils
Q: Why do you provide as standard two (2)
“local bus” communication protocols on the same RJ45 connector?
A: The ATV61/ATV71 has two protocols on the same RJ45 connector –
MODBUS RTU and CANopen. The CANopen RJ45-Sub-D adapter permits the conformance
of this connection to the Schneider Electric standard.
Q: Why are
there two (2) RJ45 connectors on the ATV61/71 product?
RJ45 situated on the front face is meant for the connection of the graphic
terminal. The RJ45 situated on the terminal board is meant for the connection to
the communication network. This makes it possible to connect the Altivar 61 to a
local bus via an integrated connector and conserve the connection of the graphic
Q: Are the fans on the ATV61/71 controlled by the
A: Yes, the fan is powered automatically as a function of
the thermal state of the drive. This reduces fan motor noise when stopped and
the increases fan life for applications that don’t run continuously
Q: Can Altivar 61 (variable torque drives) be used on constant
A: Yes, the motor command laws can be used
on constant torque applications (V/Hz law without slip compensation). However,
the Altivar 61 is optimized for variable torque applications and limited to 120%
current overload for 60s. Select the ATV61 with the required overload capability
If a higher overload is required.
Q: What is common between
Altivar 61 and Altivar 71?
A: The hardware and size of IP20 are
common up to 75KW in 415V drives. From 90KW 415V, Altivar 61 is generally one
frame size smaller than an equivalent kW rating in the ATV71 range, but all
hardware remains the same. The control board I/O is common – the firm ware is
not. Encoder cards and controller insider card are mainly dedicated for Altivar
71. However they could be used with Altivar 61. In addition, the following
options are common – Extension I/O cards – Communication card – PowerSuite –
CANopen adaptor – EMC filters – DC Chokes – Output (Motor Chokes) – Sinus
filters – Braking resistors
Q: What are the main differences
between Altivar 61 and Altivar 71?
A: Altivar 61 is designed for
variable torque applications (eg. centrifugal pumps and fans) and Altivar 71 is
for constant torque applications (eg.conveyors, hoists, blowers). ATV61 has an
current overload capacity of 120% for 60 seconds, whereas ATV71 can provide a
150% overload for 60seconds. The firmware provides the main difference and
enables access to specific functions relevant to the drive type and application.
For example, ATV71 firmware allows access to function screens for: Hoisting
applications including traverse control, limit switch management, brake logic
control, and hoist speed management with weight measurement. Load Sharing,
Positioning using sensors, and Synchronous Motor Control are also specific
functions available in ATV71. ATV61 firmware provides dedicated functions for
pump and fan applications such as flow limit detection, an energy saving law.
Altivar 61 also allows the use of dedicated (optional) Pump Application Cards
for complete management of single, dual or multi-pump applications. In addition
to all the standard and optional communications protocols available in ATV71,
ATV61 also has communication cards for LonWorks, BACnet, METASYS N2, APOGEE FLN