User manual

µC
2
SE process chiller +030220416 - rel. 2.2 - 25.01.2013
6 CONTROL
6.1 Anti-freeze
The anti-freeze probe is B2. The anti-freeze set-point A01 represents the
temperature below which the machine passes to anti-freeze mode: alarm A1
activates and switches the alarm output. The value of A01 is limited by A07. A03 is
the intervention delay time of the anti-freeze alarm when starting the machine.
6.2 Anti-freeze automatic switch-on
The parameter A10 has effect if the unit is in stand-by.
A10 = 1: auxiliary heater (if enabled) and pump are on at the same time on the
basis of the set point A04;
A10 = 2: do not select;
A10 = 3: heaters only on, on the basis of the set point A04.
6.3 Anti-freeze with EVD
4
With the EVD
4
driver connected, A14 represents the evaporation temperature
transmitted by the driver, below which the anti-freeze alarm is activated; when the
alarm is active, the compressors in the circuit affected are switched off, while the
pump remains on to reduce the possibility of freezing. Reset (manual or automatic,
see par. P05) only occurs when the water temperature exceeds A14+A02.
6.4 Compressors management
6.4.1 Digital outputs at relay (par. c01, c02, c03, c04,
c05)
The parameters in question regard the minimum operating times or switch-off
times of the same output or different outputs, with the purpose of protecting the
compressor and preventing regulation oscillations.
!
For the times set to become operational, switch the controller off and back
on again after programming.
6.4.2 Protection for the output at relay (par. c01, c02,
c03)
c01 establishes the minimum activation time of the output, independently from
request. c02 establishes the minimum switch-off time if the output, independently
from request. c03 establishes the minimum time between two successive switch-
ons of the same output.
6.4.3 Protection for outputs with different relays (par.
c04, c05)
c04 establishes the minimum time that must pass between successive switch-ons
of 2 compressors. By delaying the connection, line overloads are prevented due to
close or simultaneous peaks, c05 establishes the minimum time that must pass
between the switch-off of the two compressors.
ON
OFF
t
ALARM
S3
A14 + A02
A14
A1
Key
A
14
Anti-freeze EVD
4
alarm set-point
A02 Differential
S3
EVD
4
evaporation temperature probe
t
Time
Par. Description
Def Min Max U.M.
A01 Anti-freeze alarm se
t
-poin
t
3 A07 A04 °C/°F
A07 Anti-freeze alarm se
t
-point
limit
-40 -40 176 °C/°F
A02 Anti-freeze alarm
differential
5 0.3 122 °C/°F
A03 Anti-freeze alarm delay
time from switch-on
0 0 150 s
A01
B2
ON
A02
OFF
Key
A01 Anti-freeze set-poin
t
A02 Anti-freeze differential
B2 Anti-freeze probe
Par. Description
Def Min Max U.M.
A10 Anti-freeze automatic switch-on
0 = Disabled
1 = Heaters and pumps on
simultaneously on A4
2 = Do not select
3 = Heaters on at A4
0 0 3 -
Par. Description
Def Min Max U.M.
A14 Anti-freeze EVD
4
alarm set poin
t
3 A07 A04 °C/°F
A02 Anti-freeze alarm differential 5 0,3 122 °C/°F
Par. Description
Def Min Max U.M.
c01 Compressor minimum switch-on time 60 0 999 s
c02 Compressor minimum switch-off time 60 0 999 s
c03 Delays between switch-ons of the same
compressor
360 0 999 s
Par. Description
Def Min Max U.M.
c04 Switch-on delay between 2 compressors 10 0 999 s
c05 Switch-off delay between 2 compressors 0 0 999 s
c03
ON
OFF
ON
OFF
t
CMP1
CMP2
c01 c02
c05c04
Key
t
Time CMP1/2 Compressor 1/2
21