User manual

µC
2
SE process chiller +030220416 - rel. 2.2 - 25.01.2013
E1...E4: probe error detected also with machine in Stand-by. The presence of a
probe alarm leads to the deactivation of the compressor, the condenser fan, pump
and heater; the alarm relay and display flashing are activated. In the event of
external probe fault and compensation function enabled, the unit continues to
operate correctly, the function deactivates, a warning is activated via the alarm relay
and the message appears on the display from E1 to E4 for probes B1 to B4.
Hc1, Hc2: compressors/pumps operating hour limit exceeded warning. When the
number of operating hours for the compressor exceeds the maintenance threshold
(see par. c14), the maintenance request signal is activated.
EPr, EPb: EEPROM error
It is a parameters memorisation problem in the non-volatile machine memory
(EEPROM); µC
2
SE continues to make the regulations with the data present in the
volatile memory (RAM) if it is EPr, where there is a physical copy of all data. The
configuration is lost if a power-cut occurs. The alarm relay is not activated. If the
“EPb” error occurs on switch-on, the controller remains blocked.
EL1: zero crossing error warning. If the controller detects errors in the power
supply voltage, it is possible to lose control of fan speed. In this case, the display
will show the warning, the fans will be ordered at maximum speed only if at least
one compressor is active. Reset will be automatic, so as not to penalise unit
operation. The function is enabled only with F02= 3.
A1: anti-freeze alarm. A07 establishes the minimum limit that can be used to set
the anti-freeze alarm set point (A01). The alarm is detected via the evaporator
output water probe (B2) or, if there is an electronic expansion valve driver (EVD)
connected in tLAN, on the basis of the evaporation temperature communicated by
the driver itself. The temperature of the water leaving the evaporator is compared
with the alarm threshold A01, while the evaporation temperature is compared with
the threshold A14. The compressors are switched off immediately; the condenser
fan is activated along with the alarm relay and flashing display. Whenever µC
2
SE is
in stand by the alarm condition is not detected, but just the heaters are managed.
Reset depends on parameter P05:
1. in the event of automatic reset, the unit re-starts automatically if the temperature
is above the value of A01+A02 or A14+A02.
2. in the event of manual reset, the unit re-starts manually also if the alarm is active.
After time A03, the unit blocks again if the alarm remains.
Ht: high temperature warning. Signalling is activated if the threshold is exceeded
(read by B1), which is stated in parameter P16. This is delayed on switch-on by the
parameter P17 and causes switch-on of the alarm relay without deactivation of the
outputs and reset is automatic when the conditions that generated it have been
removed.
Lt: low temperature warning. This alarm can be reset manually or automatically
and this depends on parameter P05. The effect of the Ht/Lt alarms on the
compressor depends on parameter H24.
Par. Description
Def Min Max U.M.
P01 Flow switch alarm delay at pump
start-up
20 0 150 s
P02 Flow alarm delay in normal
conditions
5 0 120 s
P03 Low pressure alarm delay at
compressor start-up
40 0 200 s
ON
OFF
ON
OFF
t
AL
FL
P01, P02
OFF
ON
CMP
Key
t
time
Par. Description
Def Min Max U.M.
A
01
A
nti-freeze alarm set poin
t
3,0
A07
A
04 °C/°F
A
07
A
nti-freeze alarm threshold limi
t
-40
-40 176 °C/°F
A
02
A
nti-freeze alarm differential
5,0
0,3 122 °C/°F
A
03
A
nti-freeze alarm delay time
from switch-on
0
0 150 s
ON
OFF
t
A1
B2
A01+A02
A01
ON
OFF
t
A1
S3
A14+A02
A14
Key
B2 Evaporator output probe S3
EVD
4
driver evaporation probe
Par. Description
Def Min Max U.M.
P16 High temperature
threshold alarm
28
-40 176 °C/°F
P16 Relative high temperature
threshold alarm
16
0 100 °C/°F
P17 High temperature on
switch-on alarm delay
30
0 250 min
ON
OFF
t
Ht
B1
P16
P16 - 2
P17
Unit
Power ON
Key
P16 High temperature alarm
threshold
H
t
High temperature alarm
B1 Temperature probe
t
Time
37