Daikin DPS028A - Page 75

12. Click on the “Modbus
Status” menu
13. If the drive return drive is
wired correctly and is
communicating then the
SF MB status will show
“OK” while the RF MB
status will show “Fault”.
Verify wiring connections
and 3-phase power to the
ECM if both SAF and RF
status show “Fault.”
14. Click on the “ECM Cong” menu
15. Set “ECM cong” to
“SetAdd2”
16. The controller will revert back to the “ECM Cong” menu
but now the SF MB Status will show fault while the RF
MB Status will show ok.
17. Hit the middle rectangular button to go back to the main
menu.
18. Click on the “Unit
Conguration” menu and
set the SAF type back to
the original setting.
19. Scroll up and set “Apply
changes” to yes.
20. Reset MMPs for the supply and energy recovery drive to
observe ER MB Status and SF MB Status show “OK”
ECM Smoke Purge or Ventilation Override
Microtech III has been congured via modbus to perform a
ventilation override if terminals Din2 and GND at Terminal strip
3 on the ECM are made. Install an isolation relay that would
make a dry NO contact across the return/exhaust fan Din2 and
GND per Detail A on page 83.
Figure 69: Smoke Purge Wiring
In a smoke situation, the eld wired smoke detector would
eliminate 24VAC to the DI4 terminal at the Microtech controller
issuing an emergency fault at the Microtech keypad. The entire
unit would shut down in which case the eld would need to
congure the NO to close upon a smoke shutdown and allow
the return/exhaust fan to run. Setting the speed of the drive
during ventilation override is described below.
Setting the RF/EF max vent speed:
1. After entering the
controller password 6363,
click on “Commission Unit”
2. Scroll down and click on
“RF/EF Set-Up”
3. Scroll down to
“MaxVentSpd” and select
the desired speed for the
ECM during a smoke
shutdown.
SF MB Status = Supply Fan Modbus
RF MB Status = Return Fan Modbus
ER MB Status = Energy Recovery
Modbus
eCM MoTor
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