Soft Start - Varian Turbo-V 2K-G 969-8871 Manual De Instrucciones

Signals description
START/STOP: input signal to start or stop the
pump. With the supplied cover connector the
START/STOP (+) signal is connected to the +24
Vdc pin and the START/STOP (-) signal to the
GROUND pin: in this condition the pump auto-
matically starts as soon as the controller recog-
nises the input supply ("Plug & Pump").
INTERLOCK: input signal to confirm the pump ro-
tation. With the supplied cover connector the
INTERLOCK (+) signal is connected to the +24
Vdc pin and the INTERLOCK (-) signal to the
GROUND pin, in this condition the pump auto-
matically starts as soon as the controller recog-
nises the input supply ("Plug & Pump").
SPEED SETTING: PWM input signal to set the
pump speed. The PWM signal characteristics must
be the following:
•
frequency: 100 Hz +/-20%
•
amplitude: high level from 12 to 24 V
•
duty cycle range: from 25% to 75%
corresponding to a pump speed from 475 Hz
to 555 Hz linearly (see the following diagram).
NOTE
High Speed is the nominal rotational frequency of
the pump (555Hz). Low Speed (475 Hz) corre-
sponds to the rotational frequency for a stand by
status, to preserve the bearing life. Users can set
rotational frequency between these two values.
If any signal isn't applied (no connection) the driv-
ing frequency is set to "Maximum excitation fre-
quency" (the default value is 555 Hz; it is settable
via serial line by means of window 121: see the
serial command table).
If a continuous signal is applied (pin 5 connected
to pin 9) the driving frequency is set to "Low
Speed" (the default value is 475 Hz; it is settable
via serial line by means of window 117: see the
serial command table).
The "Low Speed" function can also be activated by
serial line with win.001, and the low speed value
can be adjusted via serial command win.117.
Both low speed value (win.117) and high-speed
value (win.120) are limited between 475Hz (can't
be set by the user) and "Maximum excitation fre-
quency" (win.121, 555Hz default).
The duty cycle percentage is referred to the low
level portion of the PWM period.
SOFT START: input signal to activate the soft start
function. This function must be activated (pin-7
shorted with pin-9) if the pump remains unused for 1
month or more, and de-activated for the next run-up.
The soft Start phase is around 55 minutes long. The
soft start function is factory enabled for the first sys-
tem start-up. After the first pump start-up until the
normal status, the soft start is automatically disabled.
ANALOG OUTPUT: this output signal is a voltage
(from 0 to 10 Vdc) proportional to a reference quan-
tity (frequency or power) set by the user through se-
rial line (window 111). The default setting is the
frequency (see the following example diagram).
The voltage is provided between pins 14 and 15.
An high impedance input should be connected to
this output (> 100 kΩ).
74
TECHNICAL INFORMATION
NOTE
87-900-968-01(C)