DAB PUMPS PWM 201, Инструкция по установке и обслуживанию

Страница: 95 / 635

ENGLISH
93
5.1.3 Setting the direction of rotation
Once the pump has started up, the user must ensure that the direction of rotation is correct (the direction is usually indicated by
an arrow on the pump casing). To start up the motor and check the direction of rotation, simply switch on a utility.
From the same menu as RC (MODE SET – "Installer menu") press MODE and scroll through the menus to RT. In these
conditions, b and – enable the user to invert the direction of motor rotation. The function is also enabled when the motor
is running.
If it is not possible to see the direction of motor rotation, proceed as follows:
Method to check rotation frequency
- Access parameter RT as described above.
- Turn on a utility and observe the frequency that is shown on the status bar at the bottom of the utility control page, to ensure that the
operating frequency is less than the rated frequency of the pump FN.
- Without changing collection, modify parameter RT by means of b or – and check frequency FR again.
- The correct RT parameter is that which requires, compared to collection, a lower frequency FR.
5.1.4 Setting the setpoint pressure
From the main menu, press and hold MODE and SET simultaneously until “SP” appears on display. In these conditions, buttons
“+” and “–“ enable respectively increase and decrease of the required pressure value.
The regulation range depends on the sensor used.
Press SET to return to the main page.
5.1.5 System with flow sensor
From the installer menu (the same used to set RC, RT and FN) scroll through the parameters using MODE to reach FI.
To work with the flow sensor set FI to 1. Use MODE to scroll through to the next parameter FD (pipeline diameter) and set the
diameter in inches of the pipe mounting the flow sensor.
Press SET to return to the main page.
5.1.6 System without flow sensor
From the installer menu (the same used to set RC RT and FN) scroll through the parameters using MODE to display FI. To
work without the flow sensor, set FI to 0 (default value).
Without the flow sensor, there are two flow reading modes, both settable on parameter FZ in the installer menu.
•
Automatic (self-learning): the system automatically identifies the flow and automatically adjusts settings accordingly.
To set this operating mode, set FZ to 0.
• Minimum frequency mode: in this mode the shutdown frequency is set at zero flow. To use this mode, move to
parameter FZ, close delivery gradually (to avoid generating overpressure) and read the frequency value at which the
inverter is stabilised. Set FZ at this value + 2.
Example: if the inverter stabilises at 35Hz, set FZ at 37.
An excessively low value of FZ can cause irreparable damage to the pumps, because in this case the inverter would
never stop the pumps.
An excessively high value of FZ can cause pump shutdown even when there is flow present .
Modifications to the pressure set point thus also requires adjustment of the FZ value.
On multiple inverter systems without the flow sensor, the only admissible method of setting the FZ value is in minimum
frequency mode.
The auxiliary set points are disabled if the flow sensor is not used (FI=0) and when FZ is used in minimum frequency
mode (FZ ≠ 0).