Danfoss EET Series User Manual

uHi
uLi
uLo
Danfoss
80G408
V
uHi
V
uLo
uLi
Maximum voltage limit above which the
compressor is switched o
Supply voltage
Minimum voltage limit below which the
compressor is switched o
Minimum voltage limit above which the
compressor can start
Functions
Voltage protection
The voltage protection feature protects the compressor against high and low voltage uctuations by limiting the
compressor operation within specied voltage limits. Whenever the supply voltage goes beyond the dened
voltage limits set in the controller, it will switch the compressor OFF, and resume the operation when the voltage
falls under the operating range.
Figure 1: Voltage protection
Compressor protection against short cycling
This feature protects the compressor from short ON-OFF cycles. The EET controller ensures that the compressor is
switched ON and OFF for a minimum time specied under Minimum run time (Crt) and Minimum stop time (cSt)
except during voltage and condenser protection.
Figure 2: Compressor protection against short cycling
Danfoss
80G409
min. run time
ON
OFF
CUT-IN
CUT-OFF
min. stop time
time
Temperature Power to compressor
time
Zero Cross Technology
The Zero Cross Technology controls the relay’s switching time by ensuring that the relays switch ON or OFF close to
the 0th position of the voltage curve. This ensures reduced relay contact welding, increased relay life and reduced
switching noise. This feature should only be used when the compressor is directly driven by the EET relay and no
external contactor is used.
© Danfoss | Climate Solutions | 2023.07 BC320944106159en-000301 | 5
Refrigeration controller, type EET series

Danfoss EET Series Specifications

General

Brand	Danfoss
Model	EET Series
Category	Controller
Language	English