Phase Loss CH530

Issue:

Phase loss with CH530 Controls

Resolution:

Diagnostic: Phase Loss Diagnostic

Source: Starter Module

Active Period: Compressor Start Sequence, Running and Stopping modes

Severity: Immediate Shutdown

Persistence: Latching

Description of Trigger Behavior:There are two different triggers for this diagnostic based on which mode you are in:

1. Running:
Less than 10% RLA was sensed on one or two of the current transformer inputs while running or starting.  Time to trip is 2.6 seconds

2. Starting: 
Phase Reversal Protection is enabled (In the TechView Configuration View) and either the Phase A current signal or the Phase C current is less than approximately 5 % of the CT rating. Time to trip is 0.3 seconds for Screw Compressors and 0.7 seconds for Centrifugal, and Scroll Compressors.

Troubleshooting Guide:

There are 2 variations of this diagnostic:

1.  Running: Less than 10% current was sensed on one or more of the current Transformer inputs. Time to trip is 1 second minimum, 3 seconds maximum. This is a Latching diagnostic.

2.  Starting: A second and less common method of receiving phase loss diagnostic is via the phase reversal protection circuit of the Starter module. Phase rotation protection is enabled and either the Phase A current signal or the Phase C current is less than 5% of the CT rating, then phase loss will be called out. Time to trip is 0.7 seconds for CTV during start.

The following items should be checked:
1. CT connected incorrectly relative to incoming power.
2. Defective Primary CT
3. 120 VAC missing from the Stop Relay circuit on J10-3 of the Starter module.
4. Defective High Pressure switch. Check Wiring, wire may be off or loose.  Vibration may be causing switch to chatter.
5. Problem in the Start Relay circuit on J8 of Starter module. Check all connections and circuit.
6. Verify currents are over 10% RLA.
7. Check the current overload settings.
8. Defective Starter module.
9. Turns through the CTs may be incorrect, or incorrect CT's.
10. Clean or replace contactor contacts
11. Check the Starter Wiring diagram for other components i.e., power monitoring devices that may be causing phase loss ( External device wired in series preventing start signal power).
12. The Starter contactors may be too slow to respond to the Start signal.

Starter Module I/O:

Inputs:

J5: 14 - 26 AWG with a maximum of two 14 AWG
J5-1 Vab Magnitude +
J5-2 Vab Magnitude -
J5-3 Vbc Magnitude +
J5-4 Vbc Magnitude -
J5-5 Vca Magnitude +
J5-6 Vca Magnitude -

J7: 14 - 26 AWG with a maximum of two 14 AWG
J7-1 Ia Magnitude +
J7-2 Ia Magnitude -
J7-3 Ib Magnitude +
J7-4 Ib Magnitude -
J7-5 Ic Magnitude +
J6-6 Ic Magnitude -

J12: 14 - 26 AWG with a maximum of two 14 AWG
J12-2 Transition Complete
J12-1 Neutral

Relay Outputs:

J2: 14 - 26 AWG with a maximum of two 14 AWG
J2-3 Transition Relay-Com
J2-2 Transition Relay-N.C.
J2-1 Transition Relay-N.O.

J4: 14 - 26 AWG with a maximum of two 14 AWG
J3-3 Shorting Relay-Common
J3-2 Shorting Relay-N.C.
J3-1 Shorting Relay-N.O.

J6: 14 - 26 AWG with a maximum of two 14 AWG
J6-3 Run Relay-Common
J6-2 Run Relay-N.C.
J6-1 Run Relay-N.O.

J8: 14 - 26 AWG with a maximum of two 14 AWG
J8-2 Start Relay-Common
J8-1 Start Relay-N.O.

J10: 14 - 26 AWG with a maximum of two 14 AWG
J10-3 Stop Relay-Common
J10-2 Stop Relay-N.C.
J10-1 Stop Relay-N.O.

J12: 14 - 26 AWG with a maximum of two 14 AWG
J12-2 Transition Complete
J12-1 Neutral

Notes:

Changes:

Other Question/Problem/Cause Statements:

• Phase loss; CH530

Facts:

• CDHF, CDHG
• CVGF
• CVHE, CVHF, CVHG
• CGWA, CGWB, CGWC, CGWD, CGWE, CGWF, CCAF
• RTAC
• RTHD
• CH531 Retrofit Controls (CVRD_P)
• Air-Cooled Chiller (Pueblo) (RTAC)
• CenTraVac - Direct Drive Duplex (La Crosse) (CDHF, CDHG)
• CenTraVac - Direct Drive Simplex (CVHE, CVHF, CVHG)
• CenTraVac - Gear Drive (CVGF)
• Water-Cooled Chiller (Pueblo) (RTHD)