Pulsafeeder Pulsa Series Pulsamatic Controls - Manual (Page 9)

6
4. INSTALLATION
4.1 Wiring Up
(Refer to any special wiring diagrams and installation drawings supplied by Pulsafeeder).
AC power lines should be routed to the actuator via a separate conduit from the control signal and
any optional accessory wiring. A separate switched and protected circuit is recommended for the
actuator power supply.
Remove the PULSAmatic actuator cover, which is secured by two screws, or screwed on, in the
case of an explosion proof enclosure. The two power transformers should be wired as described by
wiring diagrams. Power and ground wire should be No. 18 AWG wire size or larger. A power
ground screw is provided on the backing plate near the conduit openings. Terminal TB1-4 is also
provided as an optional circuit board ground. This terminal is connected to the circuit board
ground through a 4700 ohm resistor.
Run the signal and accessory wiring using the alternative conduit opening. No. 22 AWG wire size
or larger is recommended. Make all connections per the diagram that apply to the combination of
signal and accessories provided.
Explosion proof actuators are Underwriters Laboratories (UL) listed and are labeled with the
hazardous environments for which they are rated, along with any special installation 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.