Danfoss VLT 6000 HVAC Instrukcja Obsługi Pobierz pdf (Strona 26)

VLT

6000 HVAC

MG.60.B1.02 - VLT is a registered Danfoss trademark

2.05 Protective Features

A. Class 20 I

t electronic motor overload protection

for single motor applications and thermal-

mechanical overloads for multiple motor

applications.

B. Protection against input transients, loss of AC line

phase, short circuit, ground fault, overvoltage,

undervoltage, frequency converter

overtemperature and motor overtemperature. The

frequency converter shall display all faults in plain

text. Codes are not acceptable.

C. Protection of frequency converter from sustained

power or phase loss. The frequency converter

shall incorporate a 300 msec control power loss

ride through to eliminate nuisance tripping.

D. The frequency converter shall incorporate a motor

preheat circuit to keep the motor warm and

prevent condensation build up in the stator.

E. The frequency converter shall incorporate a run

permissive function, which will exports a "run

permissive standby" signal to a digital output,

when a start signal is applied to the frequency

converter. The frequency converter must not start

until it receives a "ready" signal from an external

contact.

F. The frequency converter shall incorporate 4 skip

frequencies with adjustable bandwidth, to prevent

mechanical resonances from destroying the

equipment.

G. To prevent breakdown of the motor winding

insulation, the U

PEAK

must be below 1000 V. The

supplier shall include with the quotation the U

PEAK

values of the frequency converter.

H. The frequency converter shall catch a rotating

motor operating forward or reverse up to full

speed to prevent nuisance tripping.

I. A thermistor input must be available in the

frequency converter.

J. The frequency converter shall incorporate

constant torque start to prevent nuisance tripping.

K. Automatic adjustment of the ramp time, to prevent

tripping, must be incorporated in the frequency

converter.

C. The frequency converter shall include Automatic

Motor Adaptation (AMA), to optimize motor

performance, improve start capabilities and

compensate for motor cable variances. AMA shall

be carried out at motor standstill with no need for

detaching the load from the motor.

D. The frequency converter and options shall be

tested to ANSI/UL Standard 508. The complete

frequency converter, including all specified

options, shall be listed by a nationally recognized

testing agency such as UL, C-UL, ETL or CSA.

E. The frequency converter shall have a DC link

reactor integrated to minimize power line

harmonics. There shall be reactors in both the

positive and negative rails. Frequency converters

without a DC link reactor shall provide 3%

impedance AC line reactors.

F. The frequency converter's full load amp rating

shall meet or exceed NEC Table 430-150.

G. The frequency converter shall be able to provide

full rated output current continuously, 110% of

rated current for 60 seconds and 160% torque for

up to 5 seconds for high inertia and high friction

loads.

H. An automatic energy optimization feature shall be

provided as standard in the frequency converter.

This feature shall reduce voltages when the motor

is lightly loaded and minimise the motor losses.

I. For additional energy savings the frequency

converter must be able to turn itself off, when

operation does not serve a purpose as determined

by the control signal. To prevent the frequency

converter from turning on and off all the time, a

Boost setpoint must be selectable.

J. The frequency converter fan must automatically

turn off at low temperatures.

K. Unlimited output power circuit switching must be

possible without the need for control circuit

interlocking and without causing damage to the

frequency converter.

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