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Function:
This parameter gives the monitoring limit of the power
transmitted to the brake resistor.
Description of choice:
The monitoring limit is determined as a product of the
maximum duty cycle (120 sec.) that will occur and the
maximum power of the brake resistor at that duty cycle
according to the following formula.
For 200-240 V units:
P
=
397
2
×
t
R
× 120
For 380 - 500 V units:
P
=
822
2
×
t
R
× 120
For 525 - 600 V units:
P
=
958
2
×
t
R
× 120
For 525 - 690 V units:
P
=
1084
2
×
t
R
× 120
403
Power monitoring
(POWER MONITORING)
Value:
Off (OFF)
[0]
Warning (Warning)
[1]
Trip (TRIP)
[2]
Function:
This parameter allows monitoring of the power trans-
mitted to the brake resistor. The power is calculated
on the basis of the resistor ohm value (parameter 401),
the intermediate circuit voltage and the resistor run-
ning time. If the power transmitted over 120 sec. ex-
ceeds 100% of the monitoring limit (parameter 402)
and
Warning
[1] has been selected, a warning will
come up on the display. The warning will disappear if
the power goes below 80%. If the calculated power
exceeds 100% of the monitoring limit and
Trip
[2] has
been selected in parameter 403
Power monitoring
, the
adjustable frequency drive will cut out while giving an
alarm. If power monitoring has been selected as
Off
[0]
or
Warning
[1], the brake function will remain active,
even if the monitoring limit has been exceeded.This
may lead to thermal overload of the resis tor. It is also
possible to have a warning via the relay/digital outputs.
The typical measuring accuracy of the power monitor-
ing depends on the accuracy of the resistor ohmic
value (better than ± 20%).
NOTE
The power dissipation during quick dis-
charge does not form part of the power
monitoring function.
Description of choice:
Select whether this function is to be active (
Warning/
Alarm
) or inactive (
Off
).
404
Brake check
(BRAKE TEST)
Value:
Off (OFF)
[0]
Warning (WARNING)
[1]
Trip (TRIP)
[2]
Function:
In this parameter a testing and monitoring function can
be integrated which will give a warning or an alarm. On
power-up it will be tested whether the brake resistor is
disconnected. The test of whether the brake resistor is
disconnected is carried out during braking, while the
test of whether the IGBT is disconnected is carried out
when there is no braking. A warning or trip disconnects
the brake function.
The testing sequence is as follows:
1.
If the intermediate circuit voltage is higher
than the brake starting voltage, discontinue
the brake check.
2.
If the intermediate circuit voltage is unstable,
discontinue the brake check.
3.
Carry out a brake test.
4.
If the intermediate circuit voltage is lower
than the starting voltage, discontinue the
brake check.
5.
If the intermediate circuit voltage is unstable,
discontinue the brake check.
6.
If the braking power is higher than 100%, dis-
continue the brake check.
VLT
®
5000 Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
126
MG.51.C5.22 - VLT
p
is a registered Danfoss trademark.
Содержание VLT 5000 Series
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Страница 196: ...RELATIVE VLT 5000 Series MG 51 C5 22 VLT p is a registered Danfoss trademark 193 List of functions ...
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