Flint & Walling Commander Pro 300 - Manual (Page 13)

13
95 North Oak Street • Kendallville, IN 46755
Single Phase Control Box Checking and Repairing Procedures
CAUTION: Turn power off and discharge capacitors before using ohmmeter.
TEST PROCEDURE
General Procedures 1. Disconnect line
2. Inspect for damaged or burned parts, loose connections, etc.
3. Check for misconnections against diagram in control box
4. If problem has not been found, check motor per Motor Data Chart and
control box as indicated below
Use of Ohmmeter 1. Ohmmeter such as Simpson Model #372 or #260, Triplett Model #630 or
#666 may be used
2. Whenever scales are changed, short ohmmeter leads and “zero balance”
meter
Ground (Insulation Resistance) Test 1. Ohmmeter Setting: Highest scale (usually R x 100K or 4 x 10,000)
2. Terminal Connections: One ohmmeter lead to “Ground” terminal on control
box and touch other lead to each of the other terminals on terminal board
3. Ohmmeter Reading: Pointer should remain at (∞) and not deflect
Overload Protector 1. Ohmmeter Setting: R x 1
2. Terminal Connections: Connect one ohmmeter lead to Terminal Black and
other lead to:
a. Terminal L
¹
in four-terminal boxes
b. Terminal L
²
in five-terminal boxes.
3. Ohmmeter Reading: Should be 0 to 0.5 ohms maximum
Capacitor Tests 1. Ohmmeter Setting: R x 1,000
2. Terminal Connections: One ohmmeter lead to relay terminal #1 and other to
black terminal on terminal board
3. Ohmmeter Reading: Pointer should swing toward “zero” and “float” back
to (∞). Capacitor is shorted if pointer does not move back to (∞), open if it
does not move from (∞)
4. If reading is not as above, disconnect capacitor from overload and test each
component
Relay Coil Test
(potential relays only)
1. Ohmmeter Setting: 4 x 1,000 (or R x 100)
2. Terminal Connections: #6 and #2 on Relay
3. Ohmmeter Reading:
For 230 Volt Boxes
G.E. 4.5 - 7.0 (4500-7000 ohms)
Cardinal 2.8 - 4.2 (2800-4200 ohms
Relay Contact Test
(potential relays only)
Most of the cases of inoperative relay contacts can be detected as follows:
1. Ohmmeter Setting: 4 x 1.
2. Terminal Connections: Terminal #1 and Terminal #2 on Relay.
3. Ohmmeter Reading: Should be “zero”.
NOTE: This test verifies “making” of contacts. If it is desired to test
“Opening” and closing of contacts:
a. Connect control box components in control box as indicated on diagram in
control box cover.
b. Connect three leads from motor of correct rating to control box terminal
board.
c. Connect power source voltage to L
¹
and L
²
.
d. Current in Red lead should momentarily be a high value - then drop
(within one second) to values on Motor Data Chart
1. Disconnect one coil lead.
Contactor Test 2. Ohmmeter setting R x 100.
3. Check coil resistance: 180 to 1400 ohms.
4. Remove contact cover and inspect contacts.