Twin City BSI / DSI Square Inline Centrifugal Fans - IM-4205 - Manual (Page 4)

4 Twin City IM 4205
Figure 3. Low End Setpoint Adjustment
NOTE: 5 amp model shown. On 10 and 15
amp models, adjustment is made through clear-
ance hole in heat sink.
SETPOINT
ADJUSTMENT
SCREW
Table 4. Speed Controller Size
Speed Control Installation
(Model DSI - optional)
Speed control is available for DSI models using 115/60/1
open type PSC or shaded pole motors.
Note: If using an EC motor to vary the speed, you must
use IM-4055.
Installation
Connect control in series with motor and line voltage
( 115V only). Never connect across line. See Figure 2.
Minimum Speed Setpoint
All controls are factory set to 65V±3V output as stan-
dard with an input voltage of 120V. If different minimum
speed is desired, the control may be adjusted by turn-
ing minimum speed pot clockwise to decrease minimum
speed and counterclockwise to increase minimum speed.
Refer to Figure 3.
Warning: If minimum speed is readjusted, verify unit
ampere draw does not exceed motor nameplate amps.
Do not operate unit in range where amp draw exceeds
motor nameplate.
Caution: These motors operate more efficiently in the
ranges set from the factory. Operating motor outside
these ranges (see Table 3) may cause motor to run
hotter and substantially shorten motor life.
Note: Lowering the minimum speed setpoint may
adversely affect motor start-up characteristics.
Warning: Certain failure modes of solid-state controls
such as half-waving can cause high levels of DC, motor
overheating and motor burn-out. Therefore, a thermal
overload protection (integral with motor) is required to
limit the maximum motor temperature under such a
failure.
Note: Do not allow any sleeve bearing motor to operate
below 500 RPM. Operation below 500 RPM will sub-
stantially shorten bearing life.
Figure 2. Connection Diagram, Speed Control
SPEED CONTROLLER
AC
LINE
(115V)
SWITCH TRI-AC
MOTOR
Table 3. Speed Controller RPM Range
NOTES:
1. Speed control available only with 115/60/1 open motors (thermally
protected).
2. Three-speed motor (multiple tap winding).
3. Speed control should not be connected to low speed tap on motor
because of starting characteristics.
4. Speed control connected to high speed tap on motor.
5. Speed control connected to medium speed tap on motor.
HP RPM MAX. RPM MIN. RPM
1/30
1650/1500/1350 2,3
1650 4 1300 4
1/8 1500 5 950 5
1/15
860 860 500
1/8
1/6
1/4
1/2
1/8
1140 1140 900
1/6
1/4
1/2
1
1/3
1725 1725 1200 1/2
3/4
MOTOR
SPEED CONTROLLER
DESIGNATION / FLA"
PART
NUMBER
ENCLO-
SURE
VOLT-
AGE
HP RPM
KBWC-15K
5 AMP
KBWC-110
10 AMP
KBWC-115
15 AMP
66801400 Open 115V 1/30
1650/1500/
1350
X
66543600 Open 115V 1/8
1650/1500/
1350
X
66804500 Open 115V 1/15 860 X
66543700 Open 115V 1/8 860 X
67123100 Open 115V 1/6 860 X
66543800 Open 115V 1/4 860 X
66543900 Open 115V 1/2 860 X
66804600 Open 115V 1/8 1140 X
67125100 Open 115V 1/6 1140 X
66544000 Open 115V 1/4 1140 X
66544100 Open 115V 1/2 1140 X
66544200 Open 115V 1 1140 X
66544300 Open 115V 1/3 1725 X
66544400 Open 115V 1/2 1725 X
67122500 Open 115V 3/4 1725 X