ABB ACQ80, Руководство по прошивке

Страница: 52 / 390

52 Program features
Note: Fault D4B0 cannot be reset until selected DI in parameter
82.02 Dry run
source
is low.
Dry run protection through minimum load current
The dry run protection through minimum load current (
82.02 Dry run source
=
Min load current
) detects the dry run condition of the pump based on the
minimum load current value defined in the parameter
82.46 Dry run current limit
.
The drive trips on the fault
D4B0 Running dry
whenever the
• actual current of the motor is less than the dry run current limit set in
parameter
82.46 Dry run current limit
,
• actual speed of the motor is greater than the minimum speed set in
parameter
79.51 Pump minimum speed
, and
• both the conditions exists for the time set in parameter
82.47 Dry run trip
monitor time
.
You can define the fault reset time with parameter
82.48 Dry run reset time
.
Settings
Parameter group
82 Pump protections
(page
239
).
82.47 Dry run trip
monitor time
82.47 Dry run trip
monitor time
82.48 Dry run
reset time
and
21.22 Start delay
82.02 Dry
run source
detected
82.02 Dry
run source
detected
82.02 Dry run
source
goes
OFF before
82.47 Dry run
trip monitor
time
elapses.
82.47 Dry run trip
monitor time
elapses
and
82.02 Dry run
source
is still ON and
displays
D4B0 Running
dry
warning
Drive
and
Pump
ON
Drive
ON
and
Pump
OFF
Scenario 1 - False alarm
Scenario 2 - Actual dry run