
Chapter 5 - DIAGNOSTICS AND FAULT FINDING
584S Frequency Inverter
5-1
Chapter 5
DIAGNOSTICS AND FAULT FINDING
INTRODUCTION
The 584S Frequency Inverters provide comprehensive diagnostic, alarm and trip facilities. These facilities minimise
the possibility of damage to the drive, motor and associated components under unusual or fault conditions. The
diagnostics and alarm information, available at the MMI display, enables ready identification of these conditions. In
the event that a fault is traced to the drive, the drive should be returned to the manufacturer - no corrective
maintenance should be attempted.
DIAGNOSTICS
The Diagnostics menu allows the user to monitor the operation of the drive. Diagnostics that can be monitored are
described in the following paragraphs. These diagnostics are read-only.
Speed Setpoints
There are two total speed setpoint diagnostics available in the Diagnostics menu:
SPEED SP (Hz)
This displays the speed setpoint in Hz.
SPEED SP (RPM)
This displays the speed setpoint in RPM. In order for this diagnostic to
operate correctly, information concerning the number of motor pole-pairs has
to be entered in the
SETUP PARAMETERS
menu (see
SPEED FEEDBACK
chapter 4).
The manual and auto setpoints are also available:
AUTO SP (Hz)
This displays the auto setpoint in Hz. When the MANUAL/AUTO digital
input (terminal 27) is connected to +24V (terminal 18 ), the total speed
setpoint becomes equal to the auto setpoint.
MANUAL SP (Hz)
This displays the manual setpoint in Hz. When the MANUAL/AUTO digital
input (terminal 27) is connected to 0V (terminal 19), the total speed setpoint
becomes equal to the manual setpoint.
LOCAL SP (Hz)
This displays the local setpoint in Hz. When the local mode is selected the
total speed setpoint becomes equal to the local setpoint.
Drive Frequency
The output
DRIVE FREQUENCY
is displayed in Hz.
Motor Current
MOTOR CURRENT
is displayed as a percentage of the drive output current. This can be scaled to read as a
percentage of the motor rated current using the
OP CURRENT CAL
parameter described in Chapter 4.
NOTE: The
MOTOR CURRENT
diagnostic may show a different value to the
MOTOR LOAD
diagnostic, especially on light loads. This is because even on no-load the motor draws typically 30%
magnetising current.
Motor Load
The estimated
MOTOR LOAD
(torque) is displayed as a percentage of the drive output current. It is assumed that
100% load corresponds to 100% output current. This can be scaled to read as a percentage of the motor rated
current using the
OP CURRENT CAL
parameter described in Chapter 4.
Overload Status
The
OVERLOAD STATUS
indicates to the user whether the current limit is active or not.
NORMAL
indicates that the current limit is
not
active.
OVERLOAD
indicates that the current limit
is
active.
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