Siemens EK 726 Series Wartungshandbuch PDF herunterladen (Seite 72)

ENGINEERING INFORMATION AND INSTRUCTIONS

MICROMASTER

MICROMASTER Vector

MIDIMASTER Vector

SIEMENS DA 64 – 2002/2003

Version D 3/48

3.15 MICROMASTER Vector

braking resistors

These braking resistors are used with the MICROMASTER

Vector drive inverters. They enable high inertia loads to be

quickly decelerated. When the motor and load decelerate, the

excess energy is fed back to the drive inverter and is stored in

the DC link capacitors. This causes the DC link voltage to

increase. The drive inverter is shutdown (tripped) when this

DC link voltage exceeds a specific value. The drive inverter

dissipates the excess energy in the externally mounting

braking resistor.

The resistor case is manufactured out of extruded aluminum

to dissipate the heat generated when braking/decelerating.

Mounting holes: 2 x 5.5 mm

Depth

1 m, 2 core shielded

cable with

6.3 mm Faston

connectors

Mounting holes: 4 x 5.5 mm

Depth

1 m, 2 core shielded

cable with

6.3 mm Faston

connectors

The resistors must be installed in a vertical position and

secured to a metal surface (> 0.5 m

) using two/four M5

screws.

They are cooled by convection so that a minimum 100 mm

clearance must be provided above and below the components

to allow an unimpeded air flow. The resistor must be mounted

at least 50 mm from the side of the inverter to prevent the

units from being overheated.

The thermal cut-out switch, supplied with the braking resistor,

should be mounted directly onto the resistor body.

Resistor

Continuous

rating

Peak

power

Resistance

(tol. ± 10%)

Peak

voltage

Dimensions Weight Inverter type

Order No. W

(5% duty

cycle)

mm kg

6SE3290-0CA87-2RA0

40 800 200 200 190 57 28 - 54 1.3 MMV12 - MMV75

MMV12/2 - MMV75/2

6SE3290-0CB87-2RA0

80 1600 100 450 280 271 57 28 - 54 1.7 MMV110 - MMV150

MMV110/2 - MMV150/2

6SE3290-0CC87-2RA0

200 4000 40 338 330 80 20 40 54 3.1

MMV220 - MMV300

MMV220/2 - MMV400/2

6SE3290-0DA87-2RA0

80 1600 400 280 270 57 28 - 54 1.7 MMV37/3 -MMV150/3

6SE3290-0DB87-2RA0

150 3000 200 900 280 271 83 23 40 54 2.5 MMV220/3 - MMV300/3

6SE3290-0DC87-2RA0

400 7500 85 400 390 103 28 40 52 3.8 MMV400/3 - MMV750/3

When braking, the inverter dissipates the braking energy of the motor and load to the externally mounted resistor. The lower the value of

the external resistor, then the greater the braking power. The resistors are able to dissipate large amounts of energy for short periods, but

when used continuously, the rating is considerably less. Standard braking resistors are designed for a 5% load duty cycle. To protect

the resistor and the inverter from overload, the MICROMASTER Vector ‘Braking chopper’ (P070) limits the duty cycle (ratio of "Time

ON" to "Time OFF") to 5% (12 seconds in 4 minutes!). This reduces the maximum dissipation level of the resistor.

The resistor must be adequately rated to withstand the resulting power dissipation. However, it may not have less than 40

W for

230V and 80

W for 400V drive units. It must also be ensured that the resistor has the required voltage strength. If an unsuitable

resistor is used, this could be destroyed as a result of the pulsed voltage.

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