Active Fan On Stand-By - Mitsubishi Electric s-MEXT-G00 006 Technical Manual

TM_s-MEXT_ME28relC_00_12_19_EN
20.5

ACTIVE FAN ON STAND-BY

Adjustment is available only for units with stand-by management activated.
The function allows the use of dynamic standby: during standby, reserve units do not keep the fan off, but keep it running at the speed set in parameter P26.17. When the
Master decides to turn on the unit in AFS mode, it returns to adjustment mode and the unit that will go into stand-by stops, and it keeps the fan running at the speed set in
parameter P26.17.
The following functions are used to manage the LAN network:
•
Management of back-up units (Stand-by).
•
Active Fan on Stand-by (AFS).
Both functions manage the LAN network as follows:
1. Management of the back-up units and their activation is managed by the Stand-by function (P26.03) according to its own rules (described in the chapter on
stand-by management) for switching the back-up units on/off.
2. Operation of the units in stand-by is managed by the AFS function (P26.16) which controls dynamic stand-by.
The diagram below represents the operating mode described above.
The parameters for enabling and configuring the Active Fan on Stand-by function are in the "Lan" menu, which can be accessed by entering the "Service" password.
For the default values, see the parameters table.
ATTENTION
The menu can be viewed only at the Master unit (Address 1).
Technical manual
UNIT 3 UNIT 4
UNIT 2
LAN
StandBy units: 2
AFS Speed: 70%
Active Fan on Stand by (AFS)
MA S TER
UNIT 10
UNIT 9 UNIT 8
!
UNIT 3 UNIT 4
UNIT 2
LAN
StandBy units: 2
AFS Speed: 70%
Active Fan on Stand by (AFS)
MA S TER
UNIT 10
UNIT 9 UNIT 8
!
UNIT 4
UNIT 3
UNIT 2
LAN
StandBy units: 2
AFS Speed: 70%
Active Fan on Stand by (AFS)
MA S TER
UNIT 10
UNIT 9 UNIT 8
Figure 20-6: Graph showing operation of the Active Fan on Stand-by
70%
70%
UNIT 5
U1 = On U2 = On
U6 = U7 = On
AFS ON
UNIT 6
UNIT 7
70%
UNIT 5
U1 = On U2 = On
U6 = U7 = On
AFS ON
UNIT 6
UNIT 7
UNIT 5
U1 = On U2 = On
U6 = On U7 = Fail U8 = On
UNIT 6
!
!
UNIT 7
114
Unit Status
U3 = On U4 = On U5 =
AFS ON
U8 = On U9 = On U10 = On
Unit Status
U3 = On U4 = Fail U5 = On
!
U8 = On U9 = On U10 = On
Unit Status
U3 = On U4 = Fail U5 = On
! !
U9 = On U10 = On
TRANSLATION OF THE ORIGINAL INSTRUCTIONS