Hydrotech MP Series PULSAtron - Manual (Page 22)

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The Signal Level output relay option is via the output signal terminals on the pump control panel. It is designed to
provide direct or inverted voltage output signals as shown in figure O. The voltage input must have a high-impedance
characteristic and must not exceed 24 VDC. The pump circuit can source or sink a maximum current of 10 mA.
The signal cord is provided with the pump and has the following polarity when connected to the pump terminals.
White = Positive (+)
Black = Common
The Power Level option is via the power relay cord which exits the pump below the control panel. The power level
relay is a zero-crossing triac-type solid-state switch as seen in figure Q which is designed to switch AC current only
and has the following ratings:
Voltage Current Power
mimimum = 12 VAC, 50/60 HZ minimum = 10 mAmps minimum = .12 watts (at 12 VAC)
maximum = 250 VAC, 50/60 HZ maximum = .5 Amps maximum = 120 watts (at 240 VAC)
* Load can be any device which meets
the above voltage and current limits
(i.e., lamp, alarm, siren, relay, etc.)
: Do not apply power directly to the relay cord without a sufficient load to limit current as
indicated above. Do not exceed the specified voltage rating. Excess current or voltage
will damage the pump and cause fire and electrical shock hazards. Do not install any type
of standard power plug to the relay cord.