Pulsafeeder PULSAmatic 7120, Installation, Operation, & Maintenance Instruction

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specifications required in support of UL listing. They must be installed, wired, operated,
and maintained in accordance with local electrical codes.
CAUTION: To help protect the integrated circuits in the servo amplifier, always
energize AC power prior to connecting the signal leads.
4.2 Start Up
Ever actuator is adjusted and calibrated at the factory. However, due to variations in input
signals
RECALIBRATION IS REQUIRED . Prior to performing this procedure (as outlined
in the next section) it is recommended that the following steps be followed in order to
verify proper mechanical operation and limit switch adjustment.
Mechanical Operation - Before applying electrical power, remove the coupling guard
between pump and motor and manually rotate the motor shaft through several
revolutions. The thin metal brake armatures should rotate in alternate directions as the
actuator shaft moves first in one direction and then the other. (If they do not, the actuator
linkage may be disconnected from the oscillating housing under the main cover). Replace
the motor coupling guard.
Limit Switch Verification - with the counter indicating 090 or less, pull out the handwheel
and rotate to increase the count. As a value of 200 is approached (from 099 to 100) a
faint click should be heard from one of the limit switches. If an audible indication of the
limit switch operation cannot be obtained, operation may be verified electrically. Turn the
handwheel back to a counter indication of 090 and pull out the override switch. Continuity
should exist between the terminals of the limit switch mounted on a double switch
bracket, farthest from the printed circuit board. Pull out and slowly rotate the handwheel
so that the counter indication increases. The switch should open, indicated by loss of
continuity, when the stroke indicator reads between 097 and 100.
Operation of the second limit switch (the one closest to the circuit board) may be checked
in a similar manner. The limit switch should be open at a stroke indicator reading between
001 and 000.
If either of the limit switches appears to be out of adjustment refer to “repairs- Limit
Switch Adjustment”.
Barring any problems proceed with “Calibrations and Adjustments”.
Refer also to the “Equipment Startup” section of the pump Installation, Operation, and
Maintenance Instructions.
5. Calibration
As stated previously, field recalibration is required upon startup. The following procures
are to be performed in sequence as presented. Refer to Figure 4 as required for circuit
component locations.
5.1 Deadband Adjustment
With pump stroke positioned exactly as commanded by the input signal, a certain change
in signal must occur in either direction (increase or decrease) in order to cause the
actuator to respond.