Hydrotech C, C PLUS, A PLUS, E, E-DC and E PLUS Series PULSAtron - Manual (Page 15)

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• The input signal must be in the form of closure of a mechanical relay or
other mechanical switching device, or solid-state relay or other solid-
state switching device. Voltage signals are prohibited. The switching
resistance of either mechanical or solid-state devices must be 100 ohms
or below when ON and 1 megohm or above when OFF. If any type of
solid-state device is employed, it must be installed with the proper
polarity, if required for the device; and leakage current must not exceed
200 microamperes to prevent false triggering in the OFF state.
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.
5.5.2 EXTERNAL PACING FUNCTION (E Plus, A Plus, C Plus & C only)
The pump's stroke rate can be controlled by an external signal input. When
the input signal line is connected and the EXTERNAL /OFF /MANUAL
switch is in the external position and a contact signal is input to the terminal
marked
, the pump makes one discharge stroke.
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.
5.5 OPERATION BY EXTERNAL INPUT SIGNALS (Options):
The pump can be controlled by three types of input signals. All are fully isolated
from AC input 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.
5.5.1 STOP FUNCTION (E Plus, A Plus, C Plus & C only)
Operation of the pump can be stopped by an external signal input. When
the external signal is input to the terminal marked which is provided at the
bottom of the control panel, the lamp (red) lights up and operation of the
pump is stopped. The stop function overrides both manual settings and
external input.
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.