DAB PUMPS MCE-22/P, Instruction For Installation And Maintenance

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various units in the group. Despite assignment as the last unit in the starting order, if the hydraulic load requires intervention of this
specific inverter, it is started up to guarantee adequate system pressure.
The starting priority is re-assigned in two conditions, according to the time ET:
1) Exchange during pumping process: when the pump is active continuously through to exceeding the maximum absolute
pumping time.
2) Exchange on standby: when the pump is on standby but 50% of the time ET has been exceeded.
If ET is set to 0, exchange occurs on standby. Each time a pump in the group stops, a different pump will be activated on restart.
If the parameter ET (maximum working time) is set to 0, exchange occurs on each restart, regardless of the effective
working time of the pump .
6.6.10 CF: Carrier frequency
This sets the carrier frequency of the inverter modulation. The value set as default, is the correct value in most cases, and therefore
modifications are not recommended unless fully aware of the changes made.
6.6.11 AC: Acceleration
This sets the speed of variation with which the inverter varies frequency. This acts both on the start-up phase and during control. In
general, the pre-set value is optimal, but in the event of problems during start-up or HP errors, it can be modified or reduced as required.
Each time this parameter is modified, it is advisable to check that system control is still efficient. In the event of problems of oscillation,
lower the GI and GP gain values; see paragraphs 6.9.4 and 6.6.5. A reduction to AC will slow down the inverter.
6.6.12 AE: Enabling the anti-blocking function
This function serves to avoid mechanical blockages in the event of prolonged disuses; it acts by periodically activating the pump in
rotation.
When this function is enabled, every 23 hours the pump complete an unblocking cycle lasting 1 minute.
6.6.13 Setup of auxiliary digital inputs IN1, IN2, IN3, IN4
This section shows the functions and possible configurations of the inputs by means of parameters I1, I2, I3, I4. For electrical
connections, see section 2.2.4.2.
The inputs are all the same and all functions can be associated with each. The parameter IN1..IN4 enables the user to associate the
required function with the input of the same name.
Each function associated with the inputs is explained in more detail further in this section.
Table 22 summarises the functions and various configurations.
The default settings are those in Table 21.
Default settings of inputs
IN1, IN2, IN3, IN4
Input Value
1 1 (float NO)
2 3 (P aux NO)
3 5 (enable NO)
4 10 (low pressure NO)
Table 23: Default settings of inputs