13-9-653 Page 29
SECTION 2
REMOTE – MOUNTED MAIN MOTOR STARTERS
CONNECTION OF REMOTE-MOUNTED MAIN MOTOR STARTERS TO ES+ CONTROL SYSTEMS
The majority of our rotary screw compressor packages feature starters completely wired and tested at the
factory. Some special applications and large units, however, do not have the main motor starter mounted
on the package. The following information describes special requirements for applications with a remote-
mounted main starter.
Starter
Regardless of starter type or brand, the following are required:
•
The starter must have its own fused control circuit (and control transformer, if required for the starter).
•
The starter must have provision for connection to a two-wire control circuit.
•
The starter must have an isolated (dry contact) normally-open auxiliary contact.
Installation and wiring
The starter should be mounted and wired in accordance with the National Electrical Code and the
manufacturers instructions. Wiring from the load terminals of the starter to the motor should include
flexible conduit to the motor junction box to allow for normal movement of the motor in the package.
The compressor package control box must have its own disconnect and overcurrent protection. If the
package has a fan, the wiring should be sized for the fan horsepower and voltage. If the package does
not include a fan, the only package load is the control transformer.
Install a separate conduit from the starter to the package control box for control wiring. Label and pull
four control wires through this conduit. Since two separate supplies are involved, run one pair of red
wires and one pair of yellow wires for identification.
Controls connections
Disconnect and remove any manual starter controls which may be mounted on the starter or elsewhere.
The starter must be controller by the compressor controls for proper operation. The following is general
information; refer to the unit wiring diagram for detailed connection.
Connect the control relay contact in the control box to the starter terminals for two-wire control. The
terminals are identified in the control box as 40 & 41 on standard packages. Refer to the starter
instructions for identification of the control terminals for two-wire control. Use the pair of yellow wires to
indicate that this circuit is from a different source.
Connect the starter auxiliary contact to the compressor control box. When connecting this contact, make
sure that no other wires are connected to it in the starter - it has to be an isolated contact. These two wire
connect to terminals 4 & 9 on standard packages. Use the pair of red wires; this is powered from the
compressor control panel control transformer.
Controls checkout
Lock the disconnect switch for the starter in the open position. Energize the compressor package control
panel. If the display indicates "SHUTDOWN - MAIN STRT CONTCT", the starter auxiliary contact is
misconnected. Remove all power and correctly wire as indicated above.
Enter the adjustments menu and perform a jog to check for proper fan rotation. If it is incorrect,
disconnect power and switch two of the three wires to the fan motor. Restore power to the control box
when done.
Summary of Contents for AUTO SENTRY-ES+
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