Vacon 10 PFC, Руководство пользователя

Страница: 62 / 82

60
•
VACON
P
ARAMETER DESCRIPTIONS
Tel. +358 (0)201 2121 • Fax +358 (0)201 212 205
10
• Autochange can take place if the number of auxiliary pumps running is
equivalent to the value in parameter 2.8 and controlled drive frequency is
lower than the value in parameter 2.9.
• If the value in parameter 2.9 is 0.0 Hz, autochange can only take place when
on standby (Stop and Snooze) regardless of the value in parameter 2.8.
2.10 A
UXILIARY PUMP START FREQUENCY
When the pump controlled at this output frequency, or higher, and the time set
in P2.11 has elapsed, an auxiliary pump will be connected.
2.11 A
UXILIARY PUMP START DELAY
The time that must elapse before an auxiliary pump is connected when the
main pump is at its maximum level of output, if required by the system.
2.12 A
UXILIARY PUMP FREQUENCY
When the controlled pump runs at this output frequency, or a lower value, and
the time set in P2.13 has elapsed, an auxiliary pump will be disconnected.
2.13 A
UXILIARY PUMP STOP DELAY
Time that must elapse before an auxiliary pump is disconnected, when the
controlled pump is at its minimum level of output.
2.14 S
NOOZE FREQUENCY
Frequency converter cuts out automatically if running frequency drops below
the snooze level, set by this parameter, for a longer period of time than estab-
lished in parameter 2.15. While Stopped, the PI controller changes the fre-
quency converter to Start mode when the current value drops below or
exceeds (see parameter 2.17) the wake-up Level set in parameter 2.16.
2.15 S
NOOZE DELAY
The minimum amount of time that frequency should remain below the snooze
Level before the frequency converter cuts out.
2.16 W
AKE
-
UP LEVEL
The wake-up level defines the level that the current value must drop below or
exceed before the Start mode of the frequency converter is restored.
2.17 W
AKE
-
UP FUNCTION
This parameter defines whether Start mode is restored when the signal of the
current value drops below or exceeds wake-up Level (parameter 2.16).
2.18 PI
HYSTERESIS
In installations where the level of noise produced by the transducer may not
allow the system to ever go into snooze mode, this parameter can help offset
this effect.