TDK-Lambda 203, Operator'S Manual, Page: 31 / 60

CONTROLS, INDICATORS, CONNECTORS
83489011 Rev A
5-7
The coolant has a wide operating temperature range and is controlled and stabilized by
the cooling water flowing through the high voltage tank. The maximum allowable tank
temperature is 45°C, and the minimum is 15°C.
This temperature range can be maintained by running normal tap water through the
power supply at a rate of 2 gallons per minute (7.58 L/min). Chilled water should not be
used, it can cause the lower operating temperature limit to be reached, as well as caus-
ing condensation to form which should always be avoided. Condensation in the power
supply may result in damage and the warranty will be void.
5.10.4.2 PURGE VALVE (Normally OFF)
The PURGE VALVE indicator illuminates when the purge valve is operating. The valve
will operate automatically, cycling on and off when necessary. The interval of operation
should be only a few minutes at a time and not more than once in any continuous 24-
hour operating period. The power supply will continue to run normally during the auto-
matic purge operation. The purge valve is designed to remove excess air that may ac-
cumulate in the high voltage tank, to allow the most efficient cooling and best possible
dielectric environment.
5.10.4.3 OVER PRESSURE (Normally OFF)
Indicates the presence of an OVER PRESSURE condition in the HV tank. Can be reset
by depressing the HV OFF button after the condition has cleared. Repeated OVER
PRESSURE faults are an indication of a problem in the HV tank. Contact the factory for
service.
5.10.5 INPUT POWER LED GROUP (External Faults)
5.10.5.1 HIGH LINE (Normally OFF)
The HIGH LINE LED illuminates when the external AC input voltage is above the maxi-
mum limit (typically 10% above nominal). Damage can result if the AC input exceeds the
rating and so the supply disconnects itself from the line by opening the contactor.
When the HIGH LINE condition is removed the indicator extinguishes and the power
supply can be reset by operating the HV OFF push-button.
5.10.5.2 LOW LINE (Normally OFF)
The LOW LINE LED will illuminate if the AC input voltage drops below approximately
85% of the nominal nameplate level. The power supply will continue to deliver output
current unless the AC input voltage dip is too great (either low voltage or for a long
time). The power supply will shut down the output until the AC line is restored. The line
fault resets the power supply automatically.
5.10.5.3 IMBALANCE (Normally OFF)
The IMBALANCE LED illuminates if an internal power imbalance occurs, which could
happen under abnormal power conditions. The fault will automatically reset when the
condition corrects itself.
The AC contactor is opened and the FAULT indicator is illuminated which may be reset
using the push-button after the IMBALANCE LED extinguishes. This does not indicate
an AC line to line imbalance.
5.10.5.4 INTERLOCK OPEN (Normally OFF)
INTERLOCK OPEN illuminates when the interlock loop on rear panel is opened. If the
interlock is opened while the supply is operating, the main AC line contactor will be