BeiJer HVAC H2 Installation & User Manual Download

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User Guide Revision 1.12

8.4.

PID Pipe Prime (Fill) Mode with Pipe Break Detection.

Pump prime mode allows starting of the pump in a safely controlled manner, to ensure consistent filling and pressurisation of pipe work and
systems. Low pressure warnings are ignored during priming to allow the system to prime correctly, whilst a failsafe timeout prevents the
pump from continuing to run in the event of a failure to prime. This helps to prevent the effects of water hammering (such as bursting water
pipes) or damage to fountain / sprinkler heads.

Operational Overview:

The Pipe Fill function with Burst Pipe detection is commissioned using the following two parameters:

P3-16: Pump Prime Time

P3-17: Burst Pipe Threshold

These parameters require security level 1 (P1-14 = 101 Default) to access.

The Pipe Fill function with Burst Pipe detection is available when the drive is operating in PID mode only. The PID function
should be commissioned in the normal way and as described in this user guide prior to enabling the Pipe Prime function.

The Pipe Fill function with Burst Pipe detection is enabled by setting a value other than 0 in parameter P3-16 (Pump Prime Time). The time
set in P3-16 should be sufficient for the PID feedback to exceed the Burst Pipe Threshold value (P3-17) under normal operating conditions.
The Burst Pipe Threshold should be set to a value just below the minimum feedback level seen by the system during normal operation.

Each time the drive is enabled whilst in PID control or is switched to PID control, the drive will monitor the PID feedback level for the time
entered in P3-16. If the PID feedback level does not exceed the threshold entered in P3-17 before the time in P3-16 expires then the drive will
trip with "Pr-Lo" (pressure low) trip.
In direct PID mode, (P3-04 = 0) PID feedback should be less than or equal to the Burst Pipe threshold before the pump prime time (P3-16)
expires. In inverse PID mode (P3-04 = 1) PID feedback should be larger than or equal to the threshold before the pump prime time (P3-16)
expires.

Failure of the Pump prime mode indicates a leak or burst pipe within the pump system and will result in the drive shutting down the pump.
During normal operation the system pressure is still continuously monitored against the Burst Pipe Threshold so that a burst pipe during
normal operation will likewise result in the drive tripping ‘low pressure’ and shutting the pump down

100

Soft Fill mode for Pipe Fill Operation:

When the pump is first started the feedback is low or zero and this can cause the PID loop to react quickly and to ramp the drive aggressively.
Good response level might be required during normal operation (once the system is primed) but could cause issues of water hammering or
other mechanical damage during start up.
In order to provide a soft Fill of the system to allow the pipe filling to take place the drive can be configured to start at a preset speed and to
run for a pre-defined time period at this speed before switching to PID operation. This function is enabled using the Boost of Wake function
described in section 7.2.8.

P6-11 sets the Speed Hold Time on enable, or the time the soft fill mode will operate.
P2-07 sets Preset speed 7 / Boost speed 1, or the speed the motor will operate whilst in soft fill mode.

Once configured the soft fill function will operate each time the drive is enabled, or wakes from standby operation.

Quick Setup Overview:



Set Basic parameters P1-01 to P1-10.



Set Parameter P1-14 = 101 to allow access to advanced parameters in menu 8



Set the PID control menu 3 parameters (see section 8)



Set the Pump Prime Time in parameter P3-16 (Normally established through monitoring the system during normal operation)



Set the Burst Pipe Threshold in parameter P3-17 (Normally established through monitoring the system during normal operation)

