SK 500E – Users Manual for Frequency Inverters
148
BU 0500 EN-3021
P552
[-01]
[-02]
CAN master circle
(CAN master cycle time)
S
0 … 100 ms
{ all 0 }
In this parameter, the cycle time for the CAN/CANopen master mode and the CANopen encoder
is set (see P503/514/515):
[-01] =
CAN Master function
, cycle time for CAN/CANopen Master functionality
[-02] = CANopen absolute encoder
, cycle time of CANopen absolute encoder
According to the Baud rate set, there are different minimum values for the actual cycle time:
Baud rate
Minimum value t
Z
Default CAN Master
Default CANopen Abs.
10kBaud
10ms
50ms
20ms
20kBaud
10ms
25ms
20ms
50kBaud
5ms
10ms
10ms
100kBaud
2ms
5ms
5ms
125kBaud
2ms
5ms
5ms
250kBaud
1ms
5ms
2ms
500kBaud
1ms
5ms
2ms
1000kBaud:
1ms
5ms
2ms
The range of values which can be set is between 0 and 100ms. With the setting 0 “Auto” the
default value (see table) is used. The monitoring function for the CANopen absolute encoder no
longer triggers at 50ms, but rather at 150ms.
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P554
Chopper min. threshold
(Minimum chopper threshold)
S
65 ... 101 %
{ 65 }
The switching threshold of the brake chopper can be influenced with this parameter. An optimized
value for numerous applications is set in the factory setting. This parameter can be increased for
applications where pulsating energy is returned (crank drives) to minimise brake resistance power
dissipation.
An increase in this setting leads to a faster overvoltage switch off of the FI.
The setting
101%
also switches off the brake chopper at the 65% switching threshold. In addition,
with this setting, monitoring is also active if the FI has not been enabled. I.e. for example if the link
circuit voltage in the FI increases above the threshold in "Standby" status (e.g. due to a mains
fault), the brake chopper is activated. However, in case of an FI fault, the brake chopper is
generally inactive.
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P555
Chopper P limitation
(Chopper power limitation)
S
5 ... 100 %
{ 100 }
With this parameter it is possible to program a manual (peak) power limit for the brake resistor.
The switch-on delay (modulation level) for the chopper can only rise to a certain maximum
specified limit. Once this value has been reached, irrespective of the level of the link voltage, the
inverter switches off the current to the resistor.
The result would be an overvoltage switch-off of the FI.
The correct percentage value is calculated as follows:
%
100
*
*
[%]
2
max
max
U
P
R
k
BW
=
R = Resistance of the brake resistor
P
maxBW
= Momentary peak power of the brake resistor
U
max
= FI chopper switching threshold
1~ 115/230 V
⇒
440 V=
3~ 230 V
⇒
500 V=
3~ 400 V
⇒
1000 V=
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Summary of Contents for BU 0500
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