14
External Control
The external pulse input should not exceed 360 pulses per minute (6Hz)
and the pump will output one stroke for every input pulse. The control
signal can be a contact closure type switch (reed) with a max load of 1mA
or a solid state device. If a solid state device is used, the external circuit
should be capable of switching 5VDC at 1.2mA with an active duty cycle
pulse width of 5ms to 100ms (actual closure time).
To connect the pulse input from an external device, wire PINs 2 and 5
from the contact closure. If using a solid state switching device, wire the
connector ensuring that PIN 2 is positive (+) and PIN 5 is Common (-).
Stop/Start and Pre-Stop Control
The EW pumps have two stop inputs. The Pre-Stop is an external input
that changes the green STOP LED to orange to signal a “LOW” condition.
This input does not control the pump. An external Stop/Start signal,
however, not only turns the STOP LED to red, but also controls the pump.
In this mode, AC power is applied continuously, but the pump operation is
stopped (or started – see section on programming) by completing the
circuit between PIN 1 and PIN 4 in Connector 2. Both the Pre-Stop and
Stop/Start signals can be a contact closure type switch (reed) with a max
load of 1mA or a solid state device. If a solid state device is used, the
external circuit should be capable of switching 5VDC at 1.2mA with an
active duty cycle pulse width of 5ms to 100ms (actual closure time).
To connect the Pre-Stop input from an external device, wire PINs 2 and 4 from the contact
closure. If using a solid state switching device, wire the connector ensuring that PIN 2 is
positive (+) and PIN 4 is Common (-).
To connect the Stop/Start input from an external device, wire PINs 1 and 4 from the contact
closure. If using a solid state switching device, wire the connector ensuring that PIN 1 is
positive (+) and PIN 4 is Common (-).
Output Relays
The EW pumps have two output relays (non-isolated PNP
transistors with a 330
Ω
resistance) in Connector 1. Output 1 is
tied to the Stop/Start input and will activate when a Stop/Start
input connection is made. Output 2 activates synchronously
with the pump stroke rate.
Contact Closure Type Outputs
The EW circuit can make either the Stop/Start (Out 1) or the
synchronous pulse (Out 2) function as contact closures, but
ONLY ONE output can be used at a time. To use the
synchronous pulse out, connect the positive side to PIN 1 and
the negative side to PINS 3&5 (jumped together). To use the
start/stop output, connect the positive side to PIN 1 and the
negative side to PINS 4&5 (jumped together).
1
5
3
4
2
1
3
4
2
STOP Input
Pre-STOP
Input
Stop/
Start
Input
Contact
Closure Input
1
5
3
4
2
Sync
Pulse
Input
OR
EW
Connector 1
