Parameter
structure
Keypad and
display
Parameter
x.00
Parameter
description format
Advanced parameter
descriptions
Macros
Serial comms
protocol
Electronic
nameplate
Performance RFC mode
Menu 5
Unidrive SP Advanced User Guide
125
Issue Number: 10 www.controltechniques.com
This parameter defines the required switching frequency. The drive may automatically reduce the actual switching frequency (without changing this
parameter) if the power stage becomes too hot. The switching frequency can reduce from 12kHz to 6kHz to 3kHz, or 16kHz to 8kHz to 4kHz. An
estimate of the IGBT junction temperature is made based on the heatsink temperature and an instantaneous temperature drop using the drive output
current and switching frequency. The estimated IGBT junction temperature is displayed in Pr
7.34
. If the temperature exceeds 135°C the switching
frequency is reduced if this is possible (i.e >4kHz) and this mode is enabled (see Pr
on page 131). Reducing the switching frequency reduces the
drive losses and the junction temperature displayed in Pr
7.34
also reduces. If the load condition persists the junction temperature may continue to
rise. If the temperature exceeds 145°C and the switching frequency cannot be reduced the drive will initiate an O.ht1 trip. Every 20ms the drive will
attempt to restore the switching frequency if the higher switching frequency will not take the IGBT temperature above 135°C.
The following table gives the sampling rate for different sections of the control system for different switching frequencies.
200V
kHz
400V
kHz
575V
kHz
690V
kHz
SP0201
16
SP0401
16
SP3501
8
SP4601
8
SP0202
16
SP0402
16
SP3502
8
SP4602
8
SP0203
16
SP0403
16
SP3503
8
SP4603
8
SP0204
16
SP0404
16
SP3504
8
SP4604
8
SP0205
16
SP0405
16
SP3505
8
SP4605
8
SP1201
16
SP1401
16
SP3506
8
SP4606
8
SP1202
16
SP1402
16
SP3507
8
SP5601
8
SP1203
16
SP1403
16
SP5602
8
SP1204
16
SP1404
16
SP6601
6
SP2201
16
SP1405
16
SP6602
6
SP2202
16
SP1406
16
SPMA1601
6
SP2203
16
SP2401
16
SPMA1602
6
SP3201
12
SP2402
16
SPMD1601
6
SP3202
12
SP2403
16
SPMD1602
6
SP4201
8
SP2404
16
SPMD1603
6
SP4202
8
SP3401
16
SPMD1604
6
SP4203
8
SP3402
16
SP5201
8
SP3403
12
SP5202
8
SP4401
8
SPMD1201
6
SP4402
8
SPMD1202
6
SP4403
8
SPMD1203
6
SP5401
8
SPMD1204
6
SP5402
8
SP6401
6
SP6402
6
SPMA1401
6
SPMA1402
6
SPMD1401
6
SPMD1402
6
SPMD1403
6
SPMD1404
6
3, 6, 12kHz 4, 8, 16kHz
Open-loop
Closed-loop
vector
Servo
Regen
Level 1
3 = 167
μ
s
6 = 83
μ
s
12 = 83
μ
s
125
μ
s
Peak limit
Current controllers
Level 2
250
μ
s
Current limit
and ramps
Speed controller and ramps
Sequencing and
Synchronization
Level 3
1ms
Voltage controller
Level 4
4ms
Time critical user interface
Background
N/A
Non-time critical user interface
Summary of Contents for unidrive sp
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