Nova-Tech LMI Roytronic Series A Metering Pump - Manual (Page 22)

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OPERATION
4.4.1 Control Modes
4.4.1.1 Local Mode
• When in Local mode the A3 pump runs continuously at maximum speed.
• When in Local mode A7 and A8 pumps run at the speed indicated by the speed
knob.
4.4.1.2 Remote Mode (for A3, and A7)
Pins 1 (brown wire) and 2 (white wire) must be connected/shorted together in order for
the pump to respond to pulses in external mode.
• In Remote mode pulses occurring faster than a rate of 1200 pulses per minute (less
than 50ms apart) and pulses with a duration of less than 25ms are ignored.
• Pulses occurring between 240 strokes per minute (SPM) and 1200 pulses per minute
results in the pump running at 240 SPM.
• Pulses occurring at less than 240 SPM results in the pump stroking at that rate.
4.4.1.3 Remote Mode (for A8)
Pins 1 (brown wire) and 2 (white wire) must be connected/shorted together in order for
the pump to respond to a milliamp signal.
In Remote mode the pump speed is controlled by a milliamp (mA) Analog Input signal.
The factory default settings for the Analog Input are: 20mA input = maximum speed,
4 mA = 0 strokes per minute. The mA input setting can be calibrated to any level between
0 – 22 mA. When recalibrating the input settings, the span between high and low input
must be greater than 6 mA. If the span is not large enough, the Pulse Indicator Light will
flash green and yellow alternately at about 10 times per second.
In the default settings, the fast level mA input is greater than the slow level mA input.
This is known as direct action. In direct action when the mA input is at or above the set-
ting for the fast level, the pump will run at maximum speed. When the mA input is below
the setting for the slow level, the pump will stop.
Reverse action is when the slow level mA input is greater than the fast level mA input. In
reverse action when the mA input is at or below the setting for the fast level, the pump
will run at maximum speed. When the mA input is above the setting for the slow level,
the pump will stop.
The default
definition of a
pulse is: close =
pulse starts, open
= pulse ends.