Figure 12: Internal Power supply
STO1
STO2
VDO
SCOM
COM
CC-000210
Figure 13: External Power supply
STO1
STO2
+
24 V
-
SCOM
CC-000211
Compressor and drive control
Typical control architecture
230V or
24V ~
Crankcase
heater
T1
T2
T3
PE
L1
L2
L3
PE
Fuses or
circuit
breaker
RS 485
Modbus
LP
DGT
Discharge
pressure
Suction
pressure
Low pressure
switch
Discharge gas
thermostat
Unit controller
STO1
STO2
VDO
SCOM
COM
Digital
input
HP
High pressure
switch
Digital
input
Digital
input
Analog
input
Analog
input
1 RS485 +
2 RS485 -
3 GND
R
S
T
PE
U
V
W
PE
3 Phase
Power input
50Hz
Motor output
LCP
CDC100
CC-000200
STO function
If STO function is
configured,
internal power supply can be used, as shown in
Figure 12: Internal Power supply
or
external 24 V power supply Can be used, as shown in
Figure 13: External Power supply
.
Compressor start and stop, speed control
Speed limit guarantees compressor reliability and must be respected. In drive control logic, default setting
values have been
qualified
by Danfoss. It is not recommended to change default values.
© Danfoss | Climate Solutions | 2023.08
AB392939083370en-000202 | 27
Scroll compressors, VCH115 | Frequency converter