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Ohmmeter Tests |
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| QD,
Solid State Control Box (Power Off) |
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A. START CAPACITOR AND RUN CAPACITOR IF APPLICABLE
(CRC)
- Meter Setting: R x 1,000.
- Connections: Capacitor terminals.
- Correct meter reading: Pointer
should swing toward zero, then back to infinity.
B. Q.D. (BLUE) RELAY
Step 1. Triac Test
- Meter setting: R x 1,000.
- Connections: Cap and B terminal.
- Correct meter reading: Infinity
for all models.
Step 2. Coil Test
- Meter Setting: R x 1.
- Connections: L1 and B.
- Correct meter reading: Zero ohms
for all models.
C. POTENTIAL (VOLTAGE) RELAY
Step 1. Coil Test
- Meter setting: R x 1,000.
- Connections: #2 & #5.
- Correct meter readings:
- For 115 Volt Boxes
.7-1.8 (700 to 1,800 ohms).
- For 230 Volt Boxes 4.5-7.0
(4,500 to 7,000 ohms).
Step 2. Contact Test
- Meter setting: R x 1.
- Connections: #1 & #2.
- Correct meter reading: Zero for
all models.
D. SOLID STATE SWITCH
Step 1. Triac Test
- Meter Setting: R x 1,000.
- Connections: R (Start) terminal
and orange lead on start switch.
- Correct meter reading: Infinity
for all models.
Step 2. Coil Test
- Meter Setting: R x 1.
- Connections: Y (Common) and L2.
- Correct meter reading: Zero ohms
for all models.
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| Ohmmeter Tests |
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| Integral
Horsepower Control Box (Power Off) |
A. OVERLOADS
(Push Reset Buttons to make sure contacts are closed.)
- Meter Setting: R x 1.
- Connections: Overload terminals.
- Correct meter reading:
Less than 0.5 ohms.
B. CAPACITOR (Disconnect leads
from one side of each capacitor before checking.)
- Meter setting: R x 1,000.
- Connections: Capacitor
terminals.
- Correct meter reading:
Pointer should swing toward zero, then drift back to infinity,
except for capacitors with resistors which will drift
back to 15,000 ohms.
C. RELAY COIL
(Disconnect lead from Terminal #5)
- Meter setting: R x 1,000.
- Connections: #2 & #5.
- Correct meter readings:
4.5-7.0 (4,500 to 7,000 ohms) for all models.
D. RELAY CONTACT (Disconnect lead
from Terminal #1)
- Meter Setting: R x 1.
- Connections: #1 & #2.
- Correct meter reading:
Zero ohms for all models.
E. CONTACTOR COIL (Disconnect
lead from one side of coil)
- Meter Setting: R x 100.
- Connections: Coil terminals.
- Correct meter reading:
180 to 1,400 ohms.
F. CONTACTOR CONTACTS
- Meter Setting: R x 1.
- Connections: L1 & T1 or
L2 & T2.
- Manually close contacts.
- Correct meter reading:
Zero ohms.
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CAUTION:
The tests in this manual for components such as capacitors,
relays, and QD switches should be regarded as indicative and
not as conclusive. For example, a capacitor may test good (not
open, not shorted) but may have lost some of its capacitance
and may no longer be able to perform its function.
To verify proper operation of QD switches or relays, refer to
operational test procedure described on Page
46, Section B-2. |
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Page 46
