Daikin DPS025 - Variable Speed Scroll Compressor

VFD Compressor Emergency Stop Control
If the VFD compressor enable output signal has been ON for
30 seconds and the controller fails to receive the VFD run
verication input, VFD Compressor Emergency Stop Control is
activated. When this function is active, VFD compressor enable
output will be turned OFF for 5 seconds and then turned
ON and ramp VFD compressor speed to 60Hz. If controller
receives a VFD run verication input, a log event is set on VFD
Emergency Stop Control. If controller fails to receive the VFD
run verication input after 3 attempts in 30 minutes, the VFD
compressor is locked out and the problem is logged.
Once active the VFD Compressor Emergency Stop Control
function remains active until one of the conditions are met.
• VFD compressor enable output signal has been ON for
30 seconds and VFD compressor status Input is ON
• VFD compressor is OFF
If the controller fails to receive the VFD run verication input
after the VFD compressor enable output signal has been ON
for 30 seconds, the circuit is shut OFF on VFD Compressor
Emergency Stop Control alarm.
Whenever this protection function becomes active a VFD
Compressor Emergency Stop Control event is recorded in the
Event Log with date and time stamp. Whenever this protection
function returns to normal a VFD Compressor Emergency Stop
Control return to normal event is recorded in the Event Log
with date and time stamp.
Variable Speed Scroll Compressor
WARNING
The compressor must only be used for its designed
purpose(s) and within its scope of application (refer
to the Operating Limits). Consult the Application
Guidelines. Under all circumstances, the EN378 (or
other applicable local safety regulations) requirements
must be fulfilled.
Daikin units with variable speed inverter compressor are
engineered with xed speed compressor in such a way that the
unit delivers only the required energy to satisfy space conditions
and provides you with exceptional energy savings. It improves
comfort through precise temperature and humidity control.
Variable speed compressor enhances energy efciency and
capable of providing unit capacity modulation down to 20% and
reduces compressor cycling and wear on compressor.
Daikin rooftop units with variable speed Inverter compressors
are provided with Internal Permanent Magnet (IPM) motors.
Compressors are designed to vary capacity by modulating
the speed of the scroll set. The speed ratio for the IPM motor
compressor is 4:1 (25 rps to 100 rps). Condenser fan modulation
and an oil management/monitoring system are provided for
reliable operation. The VFD compressor will always be rst one
ON and last one OFF.
Figure 31: Compressor Nameplate Information
Figure 32: Compressor Components
A. Model number
B. Serial number
C. Refrigerant
D. Supply voltage to CDS303 frequency converter
E. Housing service pressure
F. Factory charged lubrication
G. Compressor frequency and MaxMust trip current
refrIgeraTIon sysTeM
www.DaikinApplied.com 33 IM 1125-7 • REBEL ROOFTOPS