Dynamic DX User Manual

MT
4.3.2 Motors
4.3.2.1 Current Limit
Parameter Possible Values Default Rev HHP Lite Std Adv
Current Limit 10 – 80A 40 A -,A -
 

The Current Limit is the maximum sustained current that the Power Module is
programmed to deliver to the motor.
To protect the electronics of the Power Module, the maximum current will be
reduced further if the Power Module becomes too hot, dependent on the setting of
the
Temperature Rollback parameters (see 4.3.4.7).
Warning:
Do not set Current Limit too high for the type of motor used.
4.3.2.2 Hardware Current Limit Scaler
Parameter Possible Values Default Rev HHP Lite Std Adv
Hardware Current Limit Scaler
0 – 100 % 100 % -,A -
 

Normally the
Current Limit parameter (see 4.3.2.1) limits the current to the motor.
However, the Current Limit software algorithm has a slow response time, which allows
fast high-current transients to slip through. Fast high-current transients can
de-magnetise low current motors, resulting in motor damage.
To protect the motors from fast high-current transients, additional to the slower
software algorithm a very fast hardware algorithm is provided. This algorithm can be
programmed with the Hardware Current Limit Scaler parameter.
The value of Hardware Current Limit Scaler is given as a percentage of the nominal
current rating of the Power Module. For maximum motor protection, set this value to
match the value of the Current Limit parameter.
Current Limit
(see 4.3.2.1)
Hardware Current
Limit Scaler
Maximum
transient current
80 A 100 % 80 – 120A
60 A 75 % 60 – 90 A
40 A 50 % 40 – 60 A
25 A 31 % 25 – 37 A
Settings for a Power Module with a nominal current rating of 80 A
The actual maximum transient current is dependent on the temperature of the Power
Module. If the Power Module is warm, the limit is equal to the value set with Hardware
Current Limit Scaler. If the Power Module is cold, the limit can be up to 50% higher.
Warning:
Do not set the Hardware Current Limit Scaler lower than the software
Current Limit. This will result in a Stall Timeout Fault (see
9.6) and an
emergency stop.
33

Dynamic DX Specifications

General

Brand	Dynamic
Model	DX
Category	Network Router
Language	English