installation &
operating instructions
3750 Pulpress
Pressurisation unit
16
23.0 warnings and alarms
The 3750 constantly monitors its own performance and
will alarm in the event that a fault is detected. These alarms
are communicated through the
hmi and can be monitored
in complete detail by a
bms system through the Modbus or
BACnet connection.
In addition, a basic monitoring can be setup using the volt
free contacts.
The
3750-single system has 9, whereas twin system has
13 volt-free contacts (vfc) for communicating faults in the
unit or the system alarms it is fitted to. Pump Run VFCs are
provided as Optional.
The General/Common alarm (G) -
NO3 (Main) is triggered
by any kind of alarm on the unit which may requires
immediate attention.
The other alarms indicate a major fault with either the
3750
itself or the system it is monitoring. These alarms should be
acted on immediately and could be appropriate to use as a
Boiler Interlock.
23.1 break tank low/high water level
23.1.1 low water level
The low water level alarm will be activated when the break
tank level low switch tripped.
functions
• All pump(s) will stop running
• Activates LLL alarm on display
• Activates Low water alarm and Common Alarm VFCs.
note
This is a major alarm. In Low level alarm condition the system
will stop (pumps) until the water level returns to normal.
Once level rises above the switch, the unit will then auto
reset and operate as normal.
23.1.2 high water level
The high water level alarm will be activated when the break
tank high level switch tripped.
functions
• Activates HLL alarm on display
• Activates High water alarm and Common Alarm VFCs.
note
This is a minor alarm. In High Level alarm condition the sys-
tem will not stop, pumps operation will be unaected.
Once level drops below the switch, the unit will then auto
reset and operate as normal.
23.2 low system pressure
The low system pressure alarm will be activated when the
pressure at the respective transducer drops below the value
set for low pressure Parameter.
functions
• Activates LPr alarm on display
• Activates Boiler Interlock alarm on display
• Activates Low system pressure, Boiler interlock and
Common Alarm VFCs.
note
This is a major alarm. The unit will stop pumping to the
system with the low pressure until the pressure returns to
normal, if the low pressure is due to a system leak, it needs to
be rectified and system fill pressure restored.
The unit will then auto reset and operate as normal.
23.3 high system pressure
The high system pressure alarm will be activated when the
pressure at the transducer rises above the value set for High
Pressure Parameter.
functions
• Activates HPr alarm on display
• Activates Boiler Interlock alarm on display
• Activates High system pressure, Boiler interlock and
Common Alarm VFCs.
note
This is a major alarm. The unit will stop pumping to the sys-
tem with the high pressure alarm until it returns to normal.
The unit will then auto reset and operate as normal.
23.4 transducer failure
The transducer failure alarm will be activated when the trans-
ducer loses its signal.
functions
• All pump(s) will stop running
• Activates SF alarm on display
• Transducer failure – if the sensor exceeds check values,
activates Common Alarm contact (G)
note
This is a major alarm. The system will stop all pumps, fault
must be rectified before the unit can operate as normal.
This alarm must be manually reset.
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