Checking Incoming Voltage To Control Panel Capacitor(S) - WACKER Group LTC 4 Repair Manual

LTC Repair

7.19 Checking Incoming Voltage to Control Panel Capacitor(s)

See Graphic: wc_gr002456
WARNING
7.19.1 Remove control panel front cover.
7.19.2 Place the individual circuit breaker(s) to the light(s) in the ON position.
7.19.3 Using the AC voltage setting on the multimeter, test for 400V±10%
wc_tx000429gb.fm
Electric shock hazard. Only qualified personnel should conduct this
test.
Complete this test with the lights disconnected at the quick-
disconnects (or disconnected at the junction box), the machine
running, and the main circuit breaker in the ON position.
incoming to the control panel capacitor(s) by measuring across the
input wire (a) at the control panel capacitor(s) and the wires (b) of the
terminal strip.
• If 400V±10% is not measured, it indicates faulty wiring to the
ballast(s), faulty wiring to the control panel capacitors, or a failed
ballast. See section Checking Wiring to/from Ballast(s).
• If 400V±10% is measured, the ballast(s) is functioning. Continue
troubleshooting by checking the control panel capacitors. See
section Checking Outgoing Voltage from Control Panel
Capacitor(s).
Electrical Troubleshooting
107