Chromalox MaxPac, Руководство пользователя, Страница: 31 / 44

29
7
Maintenance
READ AND UNDERSTAND BEFORE
CARRYING OUT THE WORK DETAILED BELOW
WARNING
Hazardous Voltage: Disconnect all power before performing
any maintenance or examining the power module. Exposed
terminals may carry LETHALLY HIGH VOLTAGES when power
is applied.
Environmental Issues:
Temperature:
When mounting the SCR unit in a control panel attention should be paid to the enclosure temperature. The
SCR is rated to perform at it’s nameplate current rating in temperatures up to 50˚C (122˚F). Ensure that ad-
equate ventilation is provided or some other method of maintaining the correct cabinet temperature is used.
Cleanliness:
Careful attention must be paid in areas subjected to airborne particles The efficiency of the heatsinks rely on
there conducting surfaces being maintained in clean manner. (See Maintenance Section)
Dampness:
High humidity or hosing down should be avoided.
Connections:
Ensure that all electrical connections are secure and tight. (See Maintenance Section)
Fusing:
The I
2
t fuses installed on the SCR are designed to protect the SCR’s from faults on the load connection side.
They are NOT intended to provide wire protection.
Maintenance
Connections:
Loose connections in the power wiring will generate hot spots, which will cause degradation of electronic
equipment. Periodically inspections should be made to to ensure that connections are secure and that there
are no signs of excessive heating such as discoloration etc.
Filters:
Many high power control enclosures rely on blowers or fans to maintain a safe operating temperature. The
filters used with these devices should be changed on a periodic basis to insure adequate enclosure cooling
is maintained.