Parker ac890 - Page 483

D-87 Programming
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D
Parameter Descriptions
MAX PHASE
PREF: 134.19
Default: 0.00
Range: 0.00 t
o 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 TOR
QUE
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 follow
ing 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 to100.0000A/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.
INERTIA
PREF: 134.23
Default: 0.0010
Range: 0.0000 to 100.0000
Set the motor’s inertia. The units for t
his parameter are set by the INERTIA SCALE parameter.