Parker ac890 - Page 437

Programming
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D Page D-87
8
9
10
A
B
C
D
E
1
2
3
4
5
6
7
Parameter Descriptions
MAX PHASE
PREF: 134.19 Default: 0.00 Range: 0.00 to 90.000 degrees
Set the motor’s phase shift advance at maximum current. If this parameter is unknown, value must be set to 0.
The current setpoint I is separated into two current setpoints Iq and Id, obeying the following rule - see PHASE above.
MAX TORQUE
PREF: 134.20 Default: 12.80 Range: 0.00 to 30000.00 Nm
Set the motor’s torque at maximum current.
● KT
PREF: 134.21 Default: 1.376 Range: 0.0000 to
100.0000 Nm/A
Torque constant (Kt, Nm/A rms).
This parameter is used to compute the current demand given a torque demand :
Current demand = Torque demand / KT
In order to have correct feedbacks the following equation MUST be true:
PERM TORQUE = KT * PERM CURRENT
On a PMAC motor, the ratio between the BACK EMF and the KT is always around 60:
BACK EMF (Volts rms/1000rpm) ≈ 60 * KT (Npm/Arms)
IFMB
PREF: 134.22 Default: 0.0 Range: -100.0000 to
100.0000
A/Nm
3
Set the motor’s parameters to compute current setpoint from torque setpoint.
IFMBtorqueKTtorquecurrent *][/][][ 3
+
=
If IFMB is unknown, the value must be set to 0.