Operation and Maintenance Instructions
Envicooler
2001-03-09
Page 5
Air handling with the focus on LCC
1.3.3 Compressor Protection
If the safety circuit alarm trips the compressor will stop and a red LED will light up. A
flow monitor supervises the water flow in the cooling medium circuit. On insufficient
flow the monitor stops the compressors and initiates an alarm across a stepping
switch. The flow monitor alarm can be reset by setting the selector switch S1 in the 0
position. The safety circuit alarm will trip if any of the following four conditions arises:
•
High pressure in the system, HP
•
Low pressure in the system, LP
•
Tripped protective motor switch Q
•
Tripped thermocouple in the compressor
The group alarm safety circuit has output terminal blocks. If the safety circuit alarm
trips repeatedly, get in touch with an authorised refrigeration service company.
1.3.4 Technical Description
The compressor power cubicle of the EVC unit contains the following:
•
Main switch
•
Protective motor switch
•
Contactors
•
Auxiliary relays
•
Controller
•
Selector switch
•
Flow monitor
The cubicle is mounted inside the EVC unit and has been internally prewired and
tested at the factory.
L1 L2 L3 N PE
Power supply
3*x 400 V + N 50 Hz
Size
Rec. fuse
Rec. cable section
EVC-1610
EVC-2410
EVC-3110
EVC-4020
EVC-4820
EVC-6220
EVC-7830
EVC-9330
20 AT
25 AT
35 AT
50 AT
50 AT
63 AT
80 AT
100 AT
4 mm
2
6 mm
2
10 mm
2
16 mm
2
16 mm
2
25 mm
2
35 mm
2
50 mm
2
Envicooler
251 252
External start signal
Potential-free, NO
253 254
Group alarm
Potential-free, NO
C1 C2 C3
C4
((
!
))
SET
AL
prg
o
C
X
C
440C
Dixell
1 2
Set point
To show the set point: press the SET key.
To change the set point: press the SE T key for
at least 2 sec. Alter the setting by pressing the
arrow up or arrow down key. Then press the
SET key to save your setting.
Running period – compressors
Press and hold the clock button
for at least 3 sec. Shows the run-
ning period of each com pressor.
Flow m onitor alarm
If a buzzer sounds and a
red LED is lit, the flow
m onitor alarm has
tripped.
In-operatio n indication
A red LED indicates that
the com pressors are
running.
Input cables
EVC Selector sw itch
O
= EVC switched off
I
= EVC start m ode
To reset the flow
m onitor alarm
Press the switch to
O
;
then press it to
I
again.
Safety circuit alarm
If a red LED is lit, the safety circuit of
the relevant com pressor has tripped.
To reset the safety circuit
Press the reset button on the high
pressure switch or low pressure
switch. Reset the protective m otor
switch
.
I O
255 256
In-operation indication
C1, C2, C3
Potential-free, NO
257 258 259 260
LJ 990520
*) If the order of phases is wrong, the machine will run unusually loud.
