Hitachi SJ300 Series - Manual (Page 41)

Appendix A - Auto-tuning Procedure
41
Chapter 2 Explanation of Function
Appendix A – Auto-tuning Procedure
SJ300EL
Elevator Inverter Auto-tuning Procedure
It is necessary to perform the SJ300EL motor auto-tuning procedure to ensure optimal
performance of the inverter when operating in the sensorless vector (SLV) or vector control with
feedback modes. The procedure determines and records the electrical characteristics of the
attached motor. The procedure is similar to that of the general purpose SJ300 inverter. We
recommend you familiarize yourself with the general procedure in Chapter 4 of the SJ300
manual before proceeding with auto-tuning.
There are two general ways that auto-tuning can be carried out in elevator applications. Whether
or not the elevator cables can be removed from the motor pulley will determine which method
should be used.
AUTO-TUNING WITH ELEVATOR CABLE DISCONNECTED
If the cable can be disconnected from the motor, the online auto-tuning can be performed in the
same manner as the standard SJ300 inverter, allowing the motor shaft to rotate (H001 = 02).
This is also referred to as DYNAMIC auto-tuning.
See page A-3 .
AUTO-TUNING WITH ELEVATOR CABLE CONNECTED TO MOTOR SHAFT
If the cable CANNOT be disconnected, perform auto tuning by the following procedure instead.
The motor shaft will NOT rotate in this case.
1. Place the necessary weight in the elevator car so the counter weight and car are
balanced.
2. Perform STATIC auto tuning according to the normal SJ300 procedure, but with
H001 = 01 (no motor rotation). See page 43 .
3. After confirmation of normal termination, set H002 = 01 to command the inverter to use
the auto-tuned motor values.
4. The next steps will fine-tune I
0
(motor no load current) parameter (H033) while running
the actual system. First, enter an estimated I
0
value for the motor depending on type as :
4-pole motor – motor nameplate current x 0.35
6-pole motor – motor nameplate current x 0.45
5. Operate the car at a low speed (less than 50% of contract speed)