Danfoss VLT 6000 HVAC User Manual

VLT
®
6000 HVAC
53MG.60.B1.02 - VLT is a registered Danfoss trade mark
Installation
■■
■■
■ RFI switch
Mains supply isolated from earth:
When the VLT frequency converter is supplied from an
isolated mains source (IT mains), the RFI switch must
be closed (OFF). In the OFF position, the internal RFI
capacitors (filter capacitors) between the chassis and
the intermediate circuit are cut out so as to avoid
damaging the intermediate circuit and to reduce the
earth leakage currents (see IEC 1800-3).
The position of the RFI switch can be seen from
pages 57-59.
NB!:
When the RFI switch is set to OFF parameter
407 Switching frequency max is allowed to be
set to factory setting.
NB!
The VLT 6011/460 V has no RFI switch, since
the factory setting is ON.
NB!
The RFI switch is not to be operated with
mains supply connected to the unit. Check
that the mains supply has been disconnected before
operating the RFI switch.
NB!
The RFI switch disconnects the capacitors
galvanically; however, transients higher than
approx. 1,000 V will be bypassed by a spark
gap.
Reliable galvanic isolation (PELV) is lost if
the RFI switch is placed in the OFF
position. This means that all control in- and
outputs can no longer be considered low-voltage
terminals. In addition, the VLT 6000 HVAC EMC
performance will be reduced if the RFI switch is
placed in the OFF position.
Mains supply connected to earth:
The RFI switch must be ON for all installations on
earthed mains supplies.
■■
■■
■ High voltage test
A high voltage test can be carried out by short-
circuiting terminals U, V, W, L
1
, L
2
and L
3
and ener-
gizing by max. 2.5 kV DC for one second between
this short-circuit and the chassis.
NB!
The RFI switch must be closed (position ON)
when high voltage tests are carried out .
The mains and motor connection must be interrupted
in the case of high voltage tests of the total installa-
tion if the leakage currents are too high.
■ ■
■ ■
■ Heat emission from VLT 6000 HVAC
The tables on page 45-47 show the power loss P
Φ
(W)
from VLT 6000 HVAC. The maximum cooling air
temperature t
IN, MAX
is 40° at 100% load (of rated
value).
■■
■■
■ Ventilation of integrated VLT 6000 HVAC
The quantity of air required for cooling frequency
converters can be calculated as follows:
1. Add up the values of P
Φ
for all the frequency
converters to be integrated in the same panel.
The highest cooling air temperature (t
IN
) present
must be lower than t
IN, MAX
(40°C).
The day/night average must be 5°C lower
(VDE 160).
The outlet temperature of the cooling air must not
exceed: t
OUT, MAX
(45° C).
2. Calculate the permissible difference between the
temperature of the cooling air (t
IN
) and its outlet
temperature (t
OUT
):
∆t= 45° C-t
IN
.
3. Calculate the required
quantity of air = m
3
/h
Insert ∆t in Kelvin
The outlet from the ventilation must be placed above
the highest-mounted frequency converter.
Allowance must be made for the pressure loss across
the filters and for the fact that the pressure is going to
drop as the filters are choked.
∆t
ΣP
ϕ
x 3.1

Danfoss VLT 6000 HVAC Specifications

General

Brand	Danfoss
Model	VLT 6000 HVAC
Category	DC Drives
Language	English