Hydrotech MP Series PULSAtron - Manual (Page 20)

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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 multicontact control relay or similar means.
M 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 multicontact control relay or similar means.
M 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.
M 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 accomodated 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 4-20 mA direct or an inverse current signal when in one of the current
signal modes.
The pump automatically adjusts 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 187 ohms).
MAINTENANCE