Specifications

63230-507-201 Power Meter 750

03/2007 Section 5—Input/Output Capabilities

DIGITAL OUTPUT The PM750 has one digital output.The digital output has three operating

modes:

• External—This is the default setting. The output can be controlled by a

command sent over the communications link. To de-energize the digital

output, write the value 3320 to register 4126. To energize the digital

output, write 3321 to register 4126.

• Alarm—The output is controlled by the power meter in response to a set-

point controlled alarm condition. When the alarm is active, the output will

be ON. Multiple alarms can be associated with the same output

simultaneously.

• kWh Pulse—In this mode, the meter generates a fixed-duration pulse

output that can be associated with the kWh consumption.

Solid-state KY Pulse Output The power meter is equipped with one solid-state digital output that can be

used as a KY pulse output. The solid-state relay provides the extremely long

life—billions of operations—required for pulse initiator applications.

The output is a Form-A contact with a maximum rating of 100 mA. Because

most pulse initiator applications feed solid-state receivers with low burdens,

this 100 mA rating is adequate for most applications.

When setting the kWh/pulse value, set the value based on a 2-wire pulse

output. For instructions on calculating the correct value, see “Calculating the

Kilowatt-hour- Per-Pulse Value” on page 24 in this chapter.

2-wire Pulse Initiator Figure 5– 3 shows a pulse train from a 2-wire pulse initiator application.

Figure 5– 3: Two-wire pulse train

In Figure 5– 3, the off-to-on transitions of the output are marked as 1, 2, and

3. Each time the output transitions from off-to-on, the receiver counts a

pulse. The power meter can deliver up to 8 pulses per second.

ΔT