Danfoss Metasys N2 Design Guide

drive’s built-in clock. This battery back-up provides stable
use of all timed actions used by the drive.
•
3 analog inputs, each congurable as both
voltage and temperature input.
•
Connection of 0–10 V analog signals as well as
PT1000 and NI1000 temperature inputs.
•
3 analog outputs, each congurable as 0–10 V
outputs.
6.2.4
VLT
®
PTC Thermistor Card MCB 112
The VLT
®
PTC Thermistor Card MCB 112 provides extra
motor monitoring compared to the built-in ETR function
and thermistor terminal.
•
Protects the motor from overheating.
•
ATEX-approved for use with Ex-d motors.
•
Uses Safe Torque O function, which is approved
in accordance with SIL 2 IEC 61508.
6.2.5
VLT
®
Sensor Input Option MCB 114
The MCB 114 option protects the motor from being
overheated by monitoring the temperature of motor
bearings and windings.
•
3 self-detecting sensor inputs for 2 or 3-wire
PT100/PT1000 sensors.
•
1 extra analog input 4–20 mA.
6.3
Motion Control and Relay Cards
This section describes the motion control and relay card
options that are available with the VLT
®
AutomationDrive
series. For ordering numbers, refer to chapter 13.2 Ordering
Numbers for Options/Kits.
6.3.1
VLT
®
Extended Relay Card MCB 113
The MCB 113 option adds inputs/outputs for increased
exibility.
•
7 digital inputs.
•
2 analog outputs.
•
4 SPDT relays.
•
Meets NAMUR recommendations.
•
Galvanic isolation capability.
6.4
Brake Resistors
In applications where the motor is used as a brake, energy
is generated in the motor and sent back into the drive. If
the energy cannot be transported back to the motor, it
increases the voltage in the drive DC line. In applications
with frequent braking and/or high inertia loads, this
increase can lead to an overvoltage trip in the drive and,
nally, a shutdown. Brake resistors are used to dissipate
the excess energy resulting from the regenerative braking.
The resistor is selected based on its ohmic value, its power
dissipation rate, and its physical size. Danfoss oers a wide
variety of dierent resistors that are specially designed to
Danfoss drives. For ordering numbers and more
information on how to dimension brake resistors, refer to
the VLT
®
Brake Resistor MCE 101 Design Guide.
6.5 Sine-wave Filters
When a drive controls a motor, resonance noise is heard
from the motor. This noise, which is the result of the motor
design, occurs every time an inverter switch in the drive is
activated. The frequency of the resonance noise thus
corresponds to the switching frequency of the drive.
Danfoss supplies a sine-wave lter to dampen the acoustic
motor noise. The lter reduces the ramp-up time of the
voltage, the peak load voltage (U
PEAK
), and the ripple
current (ΔI) to the motor, which means that current and
voltage become almost sinusoidal. The acoustic motor
noise is reduced to a minimum.
The ripple current in the sine-wave lter coils also causes
some noise. Solve the problem by integrating the lter in a
cabinet or enclosure.
For ordering numbers and more information on sine-wave
lters, refer to the Output Filters Design Guide.
6.6
dU/dt Filters
Danfoss supplies dU/dt lters which are dierential mode,
low-pass lters that reduce motor terminal phase-to-phase
peak voltages and reduce the rise time to a level that
lowers the stress on the insulation at the motor windings.
This is a typical issue with set-ups using short motor
cables.
Compared to sine-wave
lters, the dU/dt lters have a cut-
o frequency above the switching frequency.
For ordering numbers and more information on dU/dt
lters, refer to the Output Filters Design Guide.
Options and Accessories Ove...
VLT
®
HVAC Drive FC 102
44 Danfoss A/S © 11/2017 All rights reserved. MG16C302
6
6

Danfoss Metasys N2 Specifications

General

Brand	Danfoss
Model	Metasys N2
Category	DC Drives
Language	English