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9 MANAGEMENT OF THE ON/OFF INPUTS
9.1 Automatic machine operation control
This control allows customers to remotely prevent the machine from operating.
- The On/Off LED flashes when this control is on.
- Message on display: SHUT OFF BY MACHINE AUTO CONTROL
Contact state: closed or connected by a jumper (automatic machine operation control = Yes)
9.2 Load shedding control
The load shedding controls on the main board are used to turn off
the stages on circuit 1.
The load shedding controls on the main board are used to turn off
the stages on circuit 2.
The stages to
b
e shut off are selected
b
y:
- Balancing the runtimes (P175 = Automatic) and the number of closed
inputs. Associated message:
“NO. STAGES TO BE SHUT OFF”.
The controller turns off the stages that have been running the longest.
- Or they can be shut off selectively (P175 = Selective): Input 1 on
circuit 1 turns off stage 1 on circuit 1. Input 2 on circuit 1 turns off
stage 2 on circuit 1. Input 1 on circuit 2 turns off stage 1 on circuit 2.
Input 2 on circuit 2 turns off stage 2 on circuit 2, and the following
message appears: "STAGE x CIRCUIT x TURNED OFF".
State of on/off contact: open at rest
These stages can also be shut off via the Modbus protocol (bits
515 to 518). Refer to the communication protocol section at the
end of these instructions.
- If P175 = Selective, OR is placed between the on/off inputs and
the information from the bus.
- If P175 = Automatic, the compressors will be shut off by the
greatest number of inputs between the on/off inputs and the bus.
Load shedding is cancelled if no information is sent
b
y the
b
us for more than 6 hours.
9.3 Water flow switch
The information is sent to an open on/off input on the water flow
switch.
Changing the fault management mode resets the number of water
flow faults.
9.3.1 Management for water-to-water units in cooling mode, air-to-water units and reversible air-to-water units
- The water flow switch is read 10 second after pump 1 or 2 is authorised
to turn on if P25 = 2 and while at one of the pumps is running.
The contact must remain open for at least 3 seconds in order to
detect a fault.
- If a water flow fault occurs during the 1-minute circulation delay
(after the last control stage), it will not be managed as a fault but
the pump will be shut off.
If
3 shutdowns occur in 1 hour
If a fault occurs:
- Pump shut off, compressor and electric stages shut off
- 1-minute time delay (10 seconds in test mode).
- Saved in fault memory
- Machine fault output not active
- Water flow fault relay on optional board in Off position
- General fault LED on console flashes
- Number of faults over a 1-hour period managed.
Display:
Resetting: The fault is automatically acknowledged after the 1-minute time delay.
If
3 shutdowns occur in 1 hour
If a fault occurs:
- Pumps shut off, compressor and electric stages shut off
- Saved in fault memory
- Machine fault output on
- Water flow fault relay on optional board in On position
- General fault LED on console lit steady
- Number of faults over a 1-hour period managed.
Display:
Resetting: Press the
Reset
button.
If reversible air-to-water +
b
oiler (P111 =
b
oiler)
A) If P27 = Yes (pump controlled by boiler operation):
- If a flow switch fault occurs on the heat pump, the boiler is
authorised to turn on.
B) If P27 = No (pump controlled only by on/off):
- If a flow switch fault occurs on the heat pump, the boiler is shut off.
9.3.2 Management for water-to-water units in heating mode
A time delay is necessary to manage this fault.
This time delay is:
- Determined by P109 if P108 = depending on control mode
- 10 seconds if P108 = depending on On/Off.
The water flow switch is read after this time delay, after pump 2 is
turned on and while pump 2 is running.
- If a water flow fault occurs during the 1-minute circulation delay
(after the last control stage), it will not be managed as a fault but
the pump will be shut off.
If
≤ 3 stops in 1 hour
If a fault occurs:
- Pump 2 is shut off
- Thermodynamic stages shut off; auxiliary heaters may remain on
- Saved in fault memory
- Fault output off
- General fault LED on console lit steady
- Time delay increased by 10 seconds before water flow fault read
- The time delay value obtained is stored in memory so that it
can be applied the next time the pump is turned on.
- The increased time delay is reset if P109 is changed.
Display:
Resetting: The fault disappears automatically after 1 minute
W A T E R F L O W F A U L T
X C U T ( S ) I N 1 H
M A C H I N E O F F
W A T E R F L O W F A U L T
W A T E R F L O W F A U L T
X C U T ( S ) I N 1 H
Содержание Magister 2 Series
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