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WARNING! The motor will automatically start when the AC line is applied or a
fault is cleared, if Jumper J4 is set to the “AUTO” or “MAN” position and the
Start/Stop Switch is eliminated.
VII. AC LINE FUSING
This control does not contain AC line fuses. Most electrical codes require that each
ungrounded conductor contain circuit protection. It is recommended to install a 20 Amp fuse
(Littelfuse 326, Buss ABC or equivalent) or a circuit breaker in series with each ungrounded
conductor. Check all electrical codes that apply to the application. Do not fuse motor leads.
VIII. TRIMPOT ADJUSTMENTS
The control circuit board contains trimpots, which are factory set
for most applications. Figure 2, on page 3 illustrates the location
of the trimpots and their approximate factory calibrated positions.
Some applications may require readjustment of the trimpots in
order to tailor the control for a specific requirement. Readjust
trimpots as described below.
WARNING! If possible, do not adjust trimpots with
the main power applied. If adjustments are made
with the main power applied, an insulated adjustment tool
must be used and safety glasses must be worn. High volt-
age exists in this control. Fire and/or electrocution can
result if caution is not exercised. Safety Warning, on page 1,
must be read before proceeding.
A. Maximum Speed (MAX):
Sets the maximum speed of the
motor. The MAX trimpot is factory set for 100% of base motor
speed. For a higher maximum speed setting, rotate the MAX
trimpot clockwise. For a lower maximum speed setting,
rotate the MAX trimpot counterclockwise. See Figure 17.
B. Minimum Speed (MIN): Sets the minimum speed of the
motor. The MIN trimpot is factory set for 0% speed. For a
higher minimum speed setting, rotate the MIN trimpot clock-
wise. See Figure 18.
C. Acceleration (ACCEL): Sets the amount of time for the
motor to accelerate from zero speed to max speed. The
ACCEL trimpot is factory set for 1.5 seconds acceleration.
For more rapid acceleration time, rotate the ACCEL trimpot
counterclockwise. For longer acceleration time, rotate the
ACCEL trimpot clockwise. See Figure 19.
Note: Rapid acceleration settings may cause the current limit
circuit to activate, which will extend the acceleration time.
D. Deceleration (DECEL): Sets the amount of time for the motor to decelerate from max
speed to zero speed. The DECELtrimpot is factory set for 1.5 seconds deceleration. For
!
9075
(Shown Factory Set to 100%)
100
80
Percent of Frequency Setting
70
110
FIGURE 17
MAX TRIMPOT RANGE
35
15
(Shown Factory Set to 0%)
40
30
0
Percent of Frequency Setting
FIGURE 18
MIN TRIMPOT RANGE
Disconnect and reconnect the AC
line.
Fault
Auto Mode
with Start/Stop Switch Installed
Manual Mode
with Start/Stop Switch Installed
Auto or Manual Mode
with Start/stop Switch Removed
Undervoltage
Overvoltage
Short Circuit
I
2
t
Control will automatically reset.
Reset the control with the
Start/Stop Switch.
Control will automatically reset.
Control will automatically reset.
Control will automatically reset.
Reset the control with the
Start/Stop Switch.
Reset the control with the
Start/Stop Switch.
Reset the control with the
Start/Stop Switch.
Reset the control with the
Start/Stop Switch.
Control will automatically reset.
Control will automatically reset.
TABLE 4 – FAULT RECOVERY & RESETTING THE CONTROL*
*Fault must be cleared before the control can be reset.
!
2.5
12.5
(Shown Factory Set to 1.5 Seconds)
1.5
5
Seconds
0.3
20
FIGURE 19
ACCEL TRIMPOT RANGE