SSI America BINARY SOLVENT DELIVERY MODULE 90-2581 REV B User Manual
Page 44
A-6
Pin
Function
10
VOLTAGE
COM
9
VOLTAGE
IN
8
FREQ
IN
7
ENABLE
IN
6
PUMP-RUN
5
PUMP-STOP
4
No
connection
3
No
connection
2
No
connection
1
COM
A.2.3 General Information on Run, Stop, and Enable Inputs
The PUMP-RUN, PUMP-STOP, and ENABLE IN inputs operate
from an internal 5 VDC source and each one draws approximately
0.008 amps when connected to COM. To activate either the PUMP-
RUN, PUMP-STOP, or ENABLE IN input connect it to COM. Any
device capable of switching 0.008 amps can be connected between the
PUMP-RUN, PUMP-STOP, or ENABLE IN input and COM, such as:
a switch contact, a relay contact, an open collector output, an open
drain output, or any output with a high logic level output of 3.8 to 6.0
volts and a low logic level output of 0.0 to 0.5 volts. A switch contact
or a relay contact is preferred since this type of connection will
provide isolation between the pump and the controlling device. The
COM terminal is internally connected to the pump's chassis ground
and should be connected to the controlling device's ground or zero volt
terminal when the controlling device has an open collector output, an
open drain output, or any output with logic level output.
A.2.4 Run and Stop Inputs
The pump's motor can be commanded to run or stop from the back
panel inputs when the pump’s flowrate is controlled from the front
panel or when the pump’s flowrate is controlled by the voltage or
frequency input. There two modes of operation for the run and stop
inputs which are described below:
Dual Signal Pulse: In this mode of operation both the PUMP-RUN
and PUMP-STOP inputs are normally at a high logic level. To start
the pump, pulse the PUMP-RUN input to a low logic level for a
minimum of 500 mS. To stop the pump, pulse the PUMP-STOP input
to a low logic level for a minimum of 500 mS.
Single Signal Level: To enable this mode of operation the PUMP-
STOP input must be permanently connected to COM with a jumper
wire. To start the pump, put a low logic level on the PUMP-RUN
input. To stop the pump, put a high logic level on the PUMP-RUN
input.