MECHANICAL PROTECTIVE SWITCH SETTINGS
See Table 12 for the recommended settings for the Mechanical
High Pressure (MHP), Mechanical Low Pressure (MLP), and
Oil Differential Pressure (OD) protective controls.
Table 12. Setpoint Settings.
DRY RUNNING THE CONTROL PANEL
On initial start-up of a new system, it’s desirable to dry run
the starter and control panel to check operation of both
operating and protective controls.
This is usually accomplished with the compressor motor
terminal leads disconnected at the starter, or at the motor (and
taped).
The absence of a motor amperage during the starting se-
quence on
MicroTech
panels bearing the software version
.07
and later will result in a controlled shutdown and safety trip.
This condition can be avoided by disconnecting either one
of the two D.C. voltage leads at the signal converter, or at ter-
minal number 9 or 10 on the TS-4 terminal strip as the starter
is energized. This action impresses a false amperage reading
on the display Microprocessor which can be read on the 20
character display if the motor amps keypad is pressed.
If, after energizing the panel, a flow switch, overload or other
safety is opened to prove the integrity of the control, the open-
ed DC circuit must be reclosed if only momentarily to decay
the impressed amperage before a repetition of the starting
operation can be attemped.
Reconnect the disconnected lead before leaving the site.
gure 19. Solid-state Relay Position
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MOTOR CONTROL
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RELAY
L4TCHOUT
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403 I Page 19
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