Pulsafeeder PULSAtron Series MP EN - Manual (Page 20)

20
OPERATION BY EXTERNAL INPUT SIGNALS:
The pump can be controlled by three types of input signals. All are fully isolated from AC input power and from Earth
ground. The input socket connections are located at the bottom of the control panel face and the signal cords are
provided with the pump. Remove rubber plugs to access plug sockets.
Stop Function:
Operation of the pump can be stopped by an external signal input. When the external signal is input to the stop terminals,
the red light goes on and operation of the pump is stopped. The stop function overrides all control options and input
signals at other terminals. Previous operation resumes when the stop signal is removed.
: Operation of more than one pump from the same contact closure will damage the pump circuits.
When such operation is required, the pump circuits must be electrically isolated from one another
by means of a multi-contact control relay or similar means.
 Input signals should be no-voltage signals from relay contacts, etc. and the input of other signals is prohibited. (In
case of relay contacts, electric resistance must be 100 ohms or below when ON and 1 Mega ohm or above when
OFF).
The stop function is commonly used in conjunction with a tank float switch. The float switch contacts are normally open
but when the tank level falls past a certain point the contacts close and the pump stops. Signal cord is provided with the
pump.
External Pacing Function:
Pump stroking can be controlled by an external pulse signal through the external signal terminals while the pump is in one
of the external pacing control modes.
: Operation of more than one pump from the same contact closure will damage the pump circuits.
When such operation is required, the pump circuits must be electrically isolated from one another
by means of a multi-contact control relay or similar means.
 After receiving an input signal, the pump generates the necessary power pulse to actuate the solenoid. The external
signal input is debounced by the pump circuit.
 Input signals should be no-voltage signals from relay contacts, etc. and the input of other signals is prohibited. (In the
case of relay contacts, electric resistance must be 100 ohms or below when ON and 1 Mega ohm or above when
OFF). The pulse duration of the input signal must be 10 milliseconds or over and the frequency of input signal must
not exceed 125 times/min unless accommodated by pulse division or pulse storage. Signal cord is provided with the
pump.
4-20 mA / 20-4 mA Function:
The pump stroking rate can be controlled by a 4-20mA current signal when in current signal mode.
The pump automatically adjusts the stroking rate according to the signal level provided to the pump.
Pumps may be wired in series to the current signal providing that the signal source is sufficient to handle the load (each
pump has an impedance of 100 ohms).