/ Ci4000 / Ci5000 Weather-Ometer
®
Service Guide Doc. No. 07-7030-00 Rev. 0
39
5.0 TROUBLESHOOTING PROCEDURES
check the transformer tap connections as
described in Section 5.1.1. Set the T1 booster
transformer lead T1-3 to the next higher lamp
boost voltage terminal. Re-attempt lamp
ignition. If the lamp still does not ignite,
continue below.
Also check the light rod for cleanliness and
damage. Confirm the LS-8 light sensor
interference filters have not expired and that
the photodiodes are functional (Sec. 7.2.9).
CAUTION: SHOCK HAZARD.
Conduct step 6 below with
meter leads clipped onto the
specified terminals. DO NOT hold probes
onto the terminals during lamp ignition or
electric shock and injury may result.
Note: In the steps below you must shut the
instrument off with the front panel power
switch after each attempt at igniting the lamp.
This will reset the lamp starting circuit.
6) Check voltage to the ignitor: Connect a voltmeter
(with clip leads) to terminals L3-1 and L3-2. Attempt
lamp ignition while watching the meter. The meter
should indicate line voltage (230V or 480V) during
the ignition pulse.
A) If line voltage is present during the ignition
pulse, the ignitor has failed. Replace it (see
Section 8.6).
B) If no voltage is present, continue below.
7) Check relay K3 operation: During an ignition
attempt, check for continuity between the terminals
of Ignition Pulse Relay K3. There should be
continuity for 1 second during each ignition pulse
between terminals:
5.2 Xenon Lamp and Irradiance
Control Malfunctions (cont.)
5.2.6 Troubleshooting Procedure –
Lamp Ignition Failure (Ignitor) (cont.)
Ci3/4000 - Terminals K3-5 and K3-6
Ci5000 - Terminals K3-6 and K3-7
A) If there is continuity across the K3 contacts
during the ignition pulse, then there is a
problem with the line voltage supply to the
relay. Check wiring to the relay and voltage
at the CB2 Ignition circuit-breaker terminals
CB2-2 and CB3-4. There should be line
voltage between each terminal and ground.
If not, replace the circuit-breaker.
B) If the relay does not activate, its coil is
bad or the PLC is not sending it an activation
signal or the 24Vac supply to the PLC is bad.
B1) Check for 24Vac on the relay coil during
the ignition pulse. If 24Vac is present, the coil
is bad. Replace the relay (see Section 8.1).
B2) During the ignition pulse, check for
continuity between terminals PLC3-1 and
PLC3-3. If there is no continuity, and the A2
LED on PLC3 is on, replace the module (see
Section 5.13.5 first). If A2 is off, download
the PLC software program to the PLC.
B3) Check for continuous 24Vac across:
Ci3/4000 – TB3-7 and TB3-9
Ci5000 – TB3-5 and TB3-8
This is the 24Vac supply to the 24Vac control
circuit. If 24Vac is not present, check circuit-
breaker CB5 and the 24Vac output of the
isolation transformer T2 at terminals
T2-X3 and T2-X4. Replace the failed breaker
or transformer.
5.2.7 Troubleshooting Procedure – Irradiance
Low or High (Wattage Regulator)
To maintain an accurate and stable irradiance level
during a test, the PLC receives a signal from the
light monitor (at PLC5-11/-13 or PLC2-12/-14),
compares it to the irradiance setpoint reference,
and then alters its output (at PLC6-7/-19) to
increase or decrease wattage regulator output.