Precision Electric: Online » AC

Dynamic Brake Selection for Sub-Micro & SMV Series Drives

Ryan Chamberlin — Mon, 15 Mar 2010 15:59:38 +0000

Dynamic braking is used when an overhauling load causes regeneration from the motor to occur, especially in situations where the required deceleration time to stop the motor cannot be achieved due to High Voltage nuisance tripping. Most Lenze-AC Tech DB circuits are rated for light-duty use only. The dynamic braking (DB) control circuit is connected to and monitors the fixed DC bus line. When the DC bus reaches 114% of the maximum tolerance, it triggers the chopper circuit in the dynamic brake. The DB circuit will be active whenever the voltage rises on the DC bus. This can occur while the drive is running, while it accelerates or decelerates or even when it is stopped. Using dynamic braking allows a faster deceleration time of a high inertia load. However, fast deceleration of a high inertia load may sometimes cause regeneration and trip the drive into a High Voltage fault. To avoid this, a dynamic brake chopping circuit is switched on when the voltage levels exceed the rated tolerance and brake resistors dissipate the regenerated voltage as excess energy.

Thermal Protection from Overload for the DB Module

Lenze-AC Tech brake modules rated at 0.33 to 10 HP have resistors that are internally mounted. In these modules there is a thermistor that monitors the resistor’s temperature and can be connected back to the drive to trigger a drive fault.

Using a Lenze-AC Tech DB with Another Manufacturer’s Drive

Applications Support is often asked if the Lenze-AC Tech DB module can be used with a non-Lenze AC Tech drive. This is not possible. The Lenze-AC Tech sub-micro drives have specific inputs that are set to trigger the Lenze-AC Tech DB modules. Other VFD manufacturers may encounter problems trying to trigger the DB chopper properly. 1 For the SMVector drives, the dynamic braking module includes a small connector that plugs onto the drive’s DC Bus Board for the B+ and B- connections. A set of mounting instructions is included.

Specifications for these Dynamic Brake Kits and diagrams are available on AC Tech Lenze manual#AN 0039A which can be viewed via PDF at our website at:

http://actech.com/documents/techlib/AN0039A.pdf

Frequency Inverters: Improving AC Motors Productivity

Ryan Chamberlin — Fri, 26 Feb 2010 17:24:27 +0000

Variable frequency inverters are used for electronic speed control of AC induction motors. The needs of the market are wide and varied, and we offer a broad range of standard products for everything from simple speed control to complex; each with a wide range of functionality, small physical size and exceptional performance. Our drives are reliable, flexible to apply, easy to commission, and meet the highest standards of quality. Lenze-AC Tech provide solutions to fulfill nearly any inverter requirement in the power range between 0.25 and 400 kW.

SMV Standard Enclosure

NEMA 1 (IP31)
120V – 600V
0.33 to 30HP ( 0.25 – 22kW)
Open-loop Vector, V/Hz

Washdown Enclosure

NEMA 4X (IP65)
120V – 600V
0.33 to 30HP ( 0.25 – 22kW)
Open-loop Vector, V/Hz

Integral Disconnect

NEMA 4X (IP65)
Integral Motor & Drive Disconnect
0.33 to 10HP ( 0.25 – 7.5kW)
Open-loop Vector, V/Hz

MC Series

120-590V
00.25 to 150 Hp (0.18-110kW)
NEMA 1 (IP31), NEMA 4(X) (IP65), NEMA 12 (IP54)
V/Hz

MCH Series

200-590V
1.0 to 250 Hp (0.75-185kW)
NEMA 1 (IP31), NEMA 4(X) (IP65), NEMA 12 (IP54)
V/Hz

Lenze – AC Tech offers many other products including but not limited to servo drives, gearmotor drives, and more. To learn more about additional Lenze – AC Tech products please contact us.

Lenze-AC Tech Announces Release of Nema 4x AC Drive up to 30HP

Ryan Chamberlin — Fri, 26 Feb 2010 16:56:44 +0000

SMVector frequency inverter – NEMA 4X (IP65)

Lenze – AC Tech’s most technically advanced inverter drive continues it’s tradition of innovative compact inverter design. The performance and flexibility make the SMVector an attractive solution for a broad range of AC Motor applications and with several communications protocols available, networking drives and components into a system solution can be done now or in the future.

The SMVector NEMA 4X (IP65) is available in two enclosure materials – for indoor only use and for indoor/outdoor use. These rugged enclosure options are ideal for many industries including food / beverage, waste water, chemical metering and processing, and pharmaceuticals.

The power ranges of the SMVector in NEMA 4X include:

120/240V – 1Phase Input, up to 1.5 HP (1.1kW)
200/240V – 1 or 3 Phase Input, up to 3.0 HP (2.2 kW)
200/240V – 3 Phase Input, up to 30 HP (22 kW)
400/480V – 3 Phase Input, up to 30 HP (22 kW)
480/600V – 3 Phase Input, up to 30 HP (22 kW)

The SMVector Series can be used with 3-phase AC induction motors and is available in NEMA 1 (IP31) , NEMA 4X (IP65) ¹ and NEMA 4X (IP65) ¹ with an integral disconnect switch. Filtered input versions of the SMV are available in NEMA 4X (IP65) models for compliance with the CE EMC directive.

Programmable digital and analog I/O allow the drive to be configured for many application specific tasks such as multiple preset speeds, electronic braking and motor jogging to name a few. Like all Lenze – AC Tech sub-micro drives, the SMVector uses EPM Memory technology for fast and efficient programming.

Technical documentation for the SMVector Series Drive, and all AC Tech brand drives, is available in our Technical Library.

¹ type 4X (IP65) enclosures are available for either indoor use, suitable for most indoor industrial environments; or indoor/outdoor use that offers UV protection and has higher impact strength at low temperatures.

Lenze-AC Tech Announces Release of the Nema 4X Terminal Cover with Potentiometer

admin — Thu, 07 Jan 2010 17:38:16 +0000

Lenze-AC Tech announces the release of the NEMA 4X Terminal Cover with Speed Potentiometer.

This Lenze-AC Tech product can replace most Hitachi Variable Frequency Drive models SJ200, L100 and L200 series products.

In addition, the following AC Tech-Lenze SMV new HP Ratings are also availabe in NEMA 4X. These models are available in the Indoor Version Only (without disconnect or filters):

15HP & 20HP (200/240V, 3ph input)

15HP, 20HP, 25HP & 30HP (400/480V, 3ph input)

15HP, 20HP, 25HP & 30HP (600V, 3ph input)

Other options for the SMVector include:

Removable Keypad Options Additional Form C Relay Output Module Additional I/O Module (includes 1 Form C relay and 2 Digital Inputs) EtherNet/IP, CANOpen, PROFIBUS DP, DeviceNet and Modbus Communication Options.