Hitachi L200 Series, Инструкция по эксплуатации

Страница: 109 / 280

L200 Inverter
Conf
igur
ing
Dr
iv
e P
a
ra
m
e
ters
3–37
Miscellaneous Settings
The miscellaneous settings include scaling factors, initialization modes, and others. This
section covers some of the most important settings you may need to configure.
B032: Reactive current setting – Each L200 inverter model is designed for a particular
motor size (hp/power rating). The inverter calculates the motor current while assuming
that the motor is matched to the inverter’s size. When using a differently sized motor (or
two or more motors in parallel), the inverter must be calibrated for this motor variation.
Adjusting parameter B032, Reactive Current Setting, will correct the inverter’s motor
current calculation. The inverter uses the current calculation for the following functions:
• D002 – Output current monitor
• B012 – Level of electronic thermal setting
• B212 – Level of electronic thermal setting, 2nd motor
• B022 – Overload restriction setting
The current calculation accuracy is normally ±20% under the following conditions:
• A single motor with standard frame size and characteristics is connected
• The inverter’s output frequency is at 50% or higher of the maximum output frequency
• The inverter’s output current is within the rated current
However, it will be necessary to calibrate the current calculation via B032, Reactive
Current Setting, if any of these conditions exist:
• The motor is smaller than the standard maximum recommended for the inverter
• The motor is a two-pole motor type
• Two or more motors are connected in parallel to the inverter (be sure to multiply the
current by the number of motors when setting B032)
If you do not know the reactive or no-load current for your particular motor, you can
calibrate the L200 as follows:
1. Connect the motor directly across the AC line with no load attached to the shaft.
WARNING: Use a disconnect switch or breaker to ensure that you do not connect the
motor or inverter to live wiring. Otherwise, there is the danger of electric shock.
2. Run the motor, and measure the no-load current with an AC current clamp, recording
the value.
3. Disconnect the motor from the AC line connection, and connect the motor to the
L200 inverter output (still with no load attached).
4. Run the motor at the base frequency (value of parameter A003), and monitor the
motor current with function D002.
5. If the D002 display value does not match the current clamp value recorded in Step 2,
increase or decrease parameter B032 until the best match is achieved.