Methods Of Externally Triggering Or Pacing A3, A7, And A8 Pumps - Milton Roy Roytronic A Series Instruction Manual

4.4

Methods of Externally Triggering or Pacing A3, A7, and A8 Pumps

Method of Triggering A3, and A7 Pumps Through External Control Connector
1. Switch Closure
Switch closing
triggers pump
2. NPN Transistor
Base goes high
to trigger pump
3. PNP Transistor
Base goes low
to trigger pump
4. Opto
Isolator
The default configuration
for the Remote On/Off
input is: open contacts
= pump stopped, closed
contacts = pump enabled.
Therefore pins 1 and 2
of the External Control
Connector must be shorted
together in external mode
for the pump to respond to
external signals.
Switch or transistors must be capable of switching 24V DC at
PIN
Blue
15 milliamperes. Minimum time in low impedance state (ON) is
3
25 milliseconds. Minimum time in high impedance state (OFF)
White 2
is 50 milliseconds.
+ Blue 3
− White NOTE: Pins 1 (Brown wire) and 2 (White wire) must be connected/
2
shorted together in order for the pump to be 'ON' in external
mode.
+ Blue 3
− White
2
+ Blue 3
− White 2
These pumps have two operating modes: Local (Pulse Indicator Light flashes
green) and Remote (Pulse Indicator Light flashes yellow). Pressing the Power/
Mode Selection Button switches between Local and Remote modes. The default
configuration for operating mode is Local mode.
When the pump is in Local mode the Remote On/Off input is ignored. When the
pump is in Remote mode the Remote On/Off input is always monitored. The
pump will return to the last power mode if power is interrupted.
Optional
Low Level
Sensor
Full (Open)
Empty (Closed)
A3, A7, A8
™
MICROPACE
A/D CONVERTER
MP-100
Higher Frequency Pulses
MICROPACE ™
4 DIGIT DIVIDER
MP-400D
Lower Frequency Pulses
™
MICROPACE
4 DIGIT MULTIPLIER
MP-500M
Pulse
Transmitter
RFP Flowmeter
OPERATION
4-20 milliamp DC
Programmable
Divider
Programmable
Divider
FC Flowmeter/Contactor
4-20 milliamp DC
A8
A3, A7
21