EN - 39
10 V
P197 P198
0 V
10 V
P197-5K P198-5K
0 V
Condenser
water outlet
temp.
Condenser
water outlet
temp.
Display:
A fault does not appear on the controller if the machine is turned off by this limit.
15.8 Soft stop via the On/Off button:
Pressing the On/Off button while the machine is on will cause the compressors to drop to 50% capacity.
Fifteen seconds later, each compressor is turned off in turn at 5 second intervals. The fans turn off at the same time as the compressor on the
corresponding circuit. The pumps turn off 1 minute after the last compressor shuts off.
The following message appears during this phase:
The machine can also be completely shut off by pressing the On/Off button twice in less than 10 seconds. Only the pumps will be turned off 1
minute after the last compressor shuts off.
16. CONTROLLING A THREE-WAY VALVE ON THE HOT WATER CIRCUIT FOR HYDROCIAT UNITS
This function is activated by assigning the three-way valve value to parameter P26 (programmable output).
The valve must be connected between terminals 2 (0 V) and 3 (10 V) on terminal block J4 on expansion board 3 (ADD3) of the Xtraconnect 2.
Parameters P197 and P198 are used to define the valve control slope.
If only one circuit is used, it must heat water to a temperature greater than P98 (35°C) so that the valve will open completely. To ensure this,
lower the three-way valve's control slope by 5°C as illustrated below:
2 circuits on 1 circuit on
A limitation logic is used, in cooling mode, to start up the machine and, if the valve opening time is too long, to reduce the compressor capacity for 2 minutes:
- If the condensing temperature rises to above 50°C during the first 2 minutes after a compressor restarts, the compressor is forced to lower its capacity for 2
minutes.
Nevertheless, we recommend selecting a three-way valve with the fastest possible fully-closed to fully-open time for the dry cooler circuit or other applications.
17. MASTER/SLAVE CONTROL OF TWO PARALLEL-CONNECTED MACHINES
For a master/slave setup involving two parallel-connected machines, the machines must be connected by a Bus link and one must be
designated as the master machine in control of the slave machine.
Menu 12 (Master/Slave) appears when parameter P28 is set to 'Yes'.
Designation of master machine:
Important: alone one machine may be configured as the master on each loop. If the master machine has already been configured and you try
to configure the slave machine as the master, the slave machine's parameter will be locked and not be accessible.
Parameter P808 sets the minimum time delay between the turning-on of machines 1 and 2.
MACHINE STOPPED COOLING
MODE
LOW LIMIT EXT. TEMP
OPERATING STOP
P26 PROG. OUTPUT 0-10V
3 WAY VALVES
P197 OUTLET LINK TO
P26 VALUE AT 0V xx.x°
P198 OUTLET LINK TO
P26 VALUE AT 10V xx.x°
12- MASTER/SLAVE
P800 MASTER MACHINE
ON LOOP YES
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