User manual

µC
2
SE process chiller +030220416 - rel. 2.2 - 25.01.2013
AHt: high temperature on plant switch-on warning. The warning does not activate
the relay and displays the "AHt" message.
ALt: low temperature on plant switch-on warning. The warning does not activate
the relay and displays the "Alt" message.
ELS/EHS: warning low/alarm high power supply voltage warning. If the power
supply voltage is too high or too low, the relative message appears on the display.
Correct operation of µC
2
SE is not guaranteed. The low voltage only leads to the
execution of the loads switch-off request. Any switch-on requests remain pending.
High voltage leads to switch-off of all excited relays.
L: low load condition warning. The warning does not activate the relay and displays
the "L" message; reset is automatic.
Driver
All of the driver alarms that block the unit are self-resetting, for µC
2
SE. Therefore
the possibility to select self-reset of the entire system must be selectable from the
driver itself via the relevant parameters. µC
2
SE can give the Go Ahead command
according to the usual alarms reset procedure from keyboard.
Ed1: tLAN communication error with the Driver.
The alarm is generated after a fixed time (5 s) from when µC
2
SE has lost contact
with the Driver. In this case, the unit is inhibited for safety reasons.
SH1: low overheating alarm.
The low overheating of circuit 1 alarm, stops circuit 1 for safety reasons after a fixed
period of time (5 s). The risk is that the compressors are flooded.
nO1: MOP warning (maximum operational pressure).
The warning appears on the display.
LO1: LOP warning (minimum operational pressure).
The warning appears on the display.
HA1: evaporator high temperature warning. The warning appears on the display.
EP1: EEPROM driver error. The circuit is inhibited for safety reasons, as there is no
driver status.
ES1: probes driver error. The circuit is inhibited for safety reasons, as there is no
driver status.
EU1: Valve open error EVD 1 start I, in system start-up, the driver detects the valve
is still open, the alarm has passed to µC
2
SE, which switches the compressors and
fans off.
Eb1: EVD battery alarm. The EVD battery alarm inhibits compressor start-up to
prevent the risk of liquid return from the circuit and relative fans.
8.3 Alarm digital inputs/outputs
Alarm digital inputs
The following digital inputs cannot be configured (see wiring diagram):
The configuration of the digital inputs as for flow switch/pump thermal
overload/general alarms with manual/automatic reset can be performed from
parameter. If the device connected to the digital input intervenes, the alarm occurs
with that displayed described in the alarms table.
Alarm digital outputs
The following digital output cannot be configured.
µC
2
SE: the function of digital outputs as alarm can be configured from parameter
(P25…P28). On occurrence of any of the alarms in the alarms table, the output
selected as alarm output switches-over.
I/O expansion board: the function of digital outputs as alarm can be configured
from parameter (P42…P46). In this case, the output only switches-over if the
selected alarm occurs.
Par. Description
Def Min Max U.M.
P19 Low temperature alarm threshold
10
-40 176 K/°
F
P19 Relative low temperature alarm
threshold
2
0 100 °C/°F
P20 High/low temperature on switch-on
protection
0/1=disabled/enabled
00 1 -
H24 High/low temperature alarm effect
0: No compressor stop
1: Stop due to high temperature
alarm
2: Stop due to low temperature
alarm
3: Stop due to high or low
temperature alarm
00 3 -
ON
OFF
t
ALt
B1
P19
Key
P19 Low temperature at switch-on alarm se
t
Al
t
Low temperature on switch-on warning
B1 Temperature probe
t
Time
Par. Description
Def Min Max U.M.
P21 Alarm relay output logic
0/1=Normally unexcited/excited
0 0 1 -
P25 Digital output 2 selection
10 = Alarm
0 0 11 -
P26 Digital output 3 selection
See P25
0 0 11 -
P27 Digital output 4 selection
See P25
0 0 11 -
P28 Digital output 5 selection
See P25
0 0 11 -
P42 Digital output 11 selection
0 = not used
1…5 = Ad1…Ad5
6 = Circuit 1 high pressure alarm
8 = Circuit 1 low pressure alarm
10 = Circuit 1 thermal overload
12 = Flow switch alarm
13 = Low temp. alarm
14 = High temp. alarm
15 = Low temperature alarm at start-up
16 = High temperature alarm at start-up
17 = Pump thermal overload
18 = Do not select
0 0 18 -
P43 Digital output 12 selection
See P42
0 0 18 -
P44 Digital output 13 selection
See P42
0 0 18 -
P45 Digital output 14 selection
See P42
0 0 18 -
P46 Digital output 15 selection
See P42
0 0 18 -
ID3 High pressure alarm inpu
t
ID4 Low pressure alarm inpu
t
NO1 Compressor outpu
t
38