ECKELMANN VS 3000 User Manual

Version 2.02 15.05.2007 Function of VS 3000
44
3.36.5 Sequence of joint Z2 discharge gas defrosting
Signal: Start delay-
for drain
heating5 to
30 min
Unload to
one stage
Speed =
Minimum
Pumpdown
to suction
pressure at
LP Low
Defrost time
10 to 30 min
Defrost termina-
tion
1 Drain heater Z2 coldrooms No start delay if power failure oc-
curs during defrosting and in sep-
arate defrost
2 SV2.2/1 and SV2.2/2 close
suction line
4 min monitoring time for pump-
down. SV opens 10 to 100 sec
after SV3.2. Z2 Low LP alarm dis-
abled
3 SV1 common discharge
line
SV3.2/1, SV3.2/2 discharge feed
closed 5 s ec later
4 SV3.2/1, SV3.2/2 discharge
gas feed
Z2 coldrooms disabled with elec-
tric defrost. Defrost termination by
temperature or defrost duration on
NT cases
5 Defrost command to Z2 re-
frigeration points via bus
6 Disable Z2 refrigeration
points via bus
Start on defrost termination. End
30 sec after first Z2 compressor
starts. Max. 5 min duration.
7 Setpoint toggle Z1 pack (no
shift)
AL 300/CI 3000 displays A before
t0 setpoint in overview
8 Forced cooling of all Z1 re-
frigeration points via bus
9 Disable LP Measuring Loop
Error alarm
5 min after opening suction line
10 Disable Z2 compressors
1.5 min before opening suc-
tion line when defrost dur-
ation equal to max. defrost
time
Pump down
or disable
compressors
Without oil equalizer:
Enable compressors when
t0_Z2 < t0_Enable
With oil
equalizer:
Enable compressors when
t0_Z2 < (t0_Z1 + 2K)
Max. disable after defrost 5 min.
Min. disable 10 sec

ECKELMANN VS 3000 Specifications

General

Brand	ECKELMANN
Model	VS 3000
Category	Controller
Language	English