Carel E2V S0 Series - Page 21

Code +030220811- rel. 1.0 – 26.04.2007
20
SHOWCASES - COLD ROOMS
Multiplexed
With
compressor
on board
Perturbed
system
Shset
Superheat set point °C 11 6 11
K prop
PID: proportional gain - 15 15 25
Ti
PID: integration time s 150 100 250
PID
Td
PID: derivative time s 5 2 5
LowSH
LowSH prot.: threshold °C 5 2 5
LowSH Ti
LowSH prot.: integration time s 15 10 25
LOP
LOP prot.: threshold °C 0
-45 °C (LT)
-25 °C (NT)
0
LOP Ti
LOP prot.: integration time s 0 10 0
MOP
MOP prot.: threshold °C
-15 °C (LT)
+5 °C (NT)
-15 °C (LT)
+5 °C (NT)
-15 °C (LT)
+5 °C (NT)
MOPTi
MOP prot.: integration time s 20 20 30
MOP HiTsurr
MOP prot.: maximum
superheated gas temperature
limit
°C 30 30 30
MOP Delay
MOP prot.: activation delay at
start
s 60 30 60
HiTcond
HiTcond prot.: threshold °C 0 60 0
PROTECTORS
HiTcond Ti
1
HiTcond prot.: integration time s 0 20 0
Tab. 8.a – Recommended parameters for SHOWCASE and COLD ROOM applications (RETAIL)
REFRIGERATION
WITH SUBCRITICAL CO
2
Multiplexed
showcases/cold rooms
with subcritical CO
2
Condenser on R404a
for subcritical CO
2
2
SHset
Superheat set point °C 13 7
K prop
PID: proportional gain - 20 15
Ti
PID: integration time sec 400 150
PID
Td
PID: derivative time sec 5 5
LowSH
LowSH prot.: threshold °C 7 3
LowSH Ti
LowSH prot.: integration time sec 15 10
LOP
LOP prot.: threshold °C 0 0
LOP Ti
LOP prot.: integration time sec 0 0
MOP
MOP prot.: threshold °C -15 °C 0
MOP Ti
MOP prot.: integration time sec 20 0
MOP HiTsurr
MOP prot.: maximum
superheated gas temperature
limit
°C 30 0
MOP Delay
MOP prot.: activation delay at
start
sec 60 0
HiTcond
HiTcond prot.: threshold °C 0 0
PROTECTORS
HiTcond Ti
HiTcond prot.: integration time sec 0 0
Tab. 8.b – Recommended parameters for SHOWCASE and COLD ROOM applications WITH SUBCRITICAL CO
2
1
The HiTcond protection can only be enabled if the condenser probe is connected to the driver and its value is sent
via LAN. Otherwise the Integration time must be set to 0.
2
Only to be used with electronic valves for superheat control on plate exchangers with R404a for cascade
condensers of compressor racks with subcritical CO
2
.
control