Instruction manual V 2.3
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PWM 230 - PWM 400 - PWM 400/7.5
Instruction manual
Important note
.
GP
and
GI
parameter values change when switching from one operating mode to
the other one. Moreover, the GP and GI values set in mode 1 are contained in a separate
memory area from the GP and GI values set in mode 2. So for example, when you switch
from mode 1 to 2, the GP value will be replaced by the one that was set in mode 2, but the
GP value set in mode 1 will be restored when switching back to mode 1.
The same value has a different weight in one or in the other mode because the control
algorithm is different.
5.1.2.5
rP: Setting the restart pressure drop
This parameter represents the pressure drop, with respect to the SP parameter value, that makes the pump
restart.
Normally rP may be set from a minimum of 0.1 to a maximum of 1.5bar. In particular conditions (see sec.
5.1.1.1) this parameter can be automatically limited.
Note:
When the controller board is controlling the PWM, the former device sets the parameter, so the user
cannot modify it anymore. If communication is lost, rP takes its usual meaning and the stored value
is automatically restored.
5.1.2.6
Ad: Setting the interconnection address
With the PWM system it is possible to build composite booster sets, with or without the “Da Vinci” controller
board’s supervision.
The admissible values of Ad are: "--", 1, 2 and 3 with the following meanings:
-
“--“ Communication is disabled.
-
“1“ the board acts as secondary PWM.
-
“2“ the board acts as primary PWM.
-
“3“ communication with the controller board.
5.1.2.6.1 Setting the address for booster sets composed by 2 PWM
Without any additional component couples of PWM devices can be organised in booster sets using different
operating strategies and communicating trough a serial interconnection. In this kind of installation on the two
units an address (“Ad”) must be set, whose value must be set to “1” on one device and to “2” on the other
one.
WARNING:
If you set the same “Ad” value on two interconnected PWMs, communication doesn't
establish and we can have regulation malfunctioning.
WARNING:
Correct operation of a multi-channel booster set is possible only if the different channels are
electrically and hydraulically identical: same electro pumps, same PWM, same manifolds,
same valves and duct geometry.
When communication is not working (due to a wrong setting of the “Ad” value, to some wiring mistake or to
some other cause) the two PWM will work as two completely independent devices but they will show the
impossibility to communicate by blinking the display while showing “Go” or “Sb”.
When the “Ad” value is correctly set, some regulation parameters are aligned on the primary and the
secondary PWM. In particular, the following parameters are copied from the former to the latter:
-
SP: Setting of the set-point pressure.
-
rP: Setting of the restarting pressure drop.
-
Eb: Enabling of the booster pump.
-
CM: Method of role exchange.
-
P1: alternate set point P1, selectable with input 2.