Watlow QPAC - Manual (Page 25)

QPAC User's Guide 25 Appendix
Specific to QPAC-33 Diagnostics
The QPAC-33 has four indicator lights for diagnostics. During normal opera-
tion, all four will be lit.
• Power on Yellow indicator light is on when power is applied to the control.
• Phase Loss Yellow indicator light is on when all three phases of line voltage are pres-
ent. Indicator light will be off if one phase is low or lost.
• Phase Rotation Yellow indicator light is on when correct voltage phase exists, even when
load is not wired. Indicator light will be off when two phases are rotated,
and when one phase is missing.
• Phase Lock Loop Yellow indicator light is on when phase lock loop circuit is sychronized.
Indicator light can go off from noisy power line or if the phase synchro-
nizing circuitry fails. Check power quality, then repair or replace power
base.
Diagnostics