Nastec MIDA 203, Руководство по установке, использованию и техническому обслуживанию

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11.2.5. Programming of slave units.
Menu Parameter Value
Control parameters COMBO ON to activate.
Control parameters Address from 01 to 07.
Control parameters Alternance ON to activate / OFF to deactivate. It is possible to determine which devices are
included in the alternation and which are not. Devices excluded from the alternation
will receive a starting priority based on their address.
NOTE
To start or stop a unit in COMBO mode, simply press the START or STOP button on the master unit
only.
NOTE
To change the operating parameters of a COMBO unit, operate on the unit's master.
When the Master Menu is exited, the remote programming of the connected slave units is required.
In this manner, all parameters set in the master are also copied to the slaves with the exception of
parameter Address.
CAUTION
When the master menu is accessed, the communication with the slave units is interrupted and the
A13 No communication alarm is produced. Communication is automatically re-established by exiting
the Master Menu.
WARNING
In case of pumps in COMBO mode, it is recommended to make the connections to the motor
respecting the same phase sequence. In this manner, it will be ensured that by copying parameter
Rotation sense from the master unit to the slave units, all the pumps in the unit will maintain the
correct running direction.
11.2.6. Automatic master replacement
In COMBO mode, if a slave or the pump connected to it should fail or enter an alarm state, the unit will continue to
operate with the remaining units.
In case the master or the pump connected to it should break down or enter an alarm state, the unit will stop for
about 30 seconds generating the A13 No communication alarm in the slaves. After the waiting time has elapsed,
the slave with address 1 will become the master, thus allowing the unit to resume operation.
If the master reappears in the unit, the latter will stop again for about 30 seconds, generating the A12 Address error
alarm in the master and in the slave 1.
After the waiting time has elapsed, the master will assume address 0 and the slave address 1, thus allowing the
unit to resume operation.
CAUTION
In order to enable automatic master changeover, parameter Autorestart must be set to ON.
Do not touch the keypad of the devices during the master replacement process, otherwise the master
change process will be interrupted.
12. Operation at constant differential pressure
12.1. Introduction
The inverter may manage the running speed of the pump in such a way as to maintain a constant differential
pressure between the delivery and the suction of the pump in circulation systems. For this purpose, a differential
pressure sensor is used or, alternatively, it is possible to use two identical pressure sensors placed one in the
suction and the other in the delivery section of the pump. The absolute difference of the read values is performed
by the device itself.
MIDA
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