 |
General
SCR Power Controller Specifications
| (Individual
specifications on each model may vary) |
| Input Voltage:
|
120, 208, 240, 277, 380, 480,
480, 575 volts, single or three phase, 50 or 60 Hertz lines. |
| Ambient:
|
All ratings are designed for
50°C maximum operating temperature. For operation at higher
temperatures (to 65° maximum), some derating is necessary;
please consult factory. |
| Input
Signals: |
0-5, 1-5, 2-12, 4-20, 10-50
ma inputs or a manual potentiometer (all standard temperature
controller outputs). |
| Adjustments: |
a. Gain adjustments provide
full output for 50% to 200% standard control signal.
b. Bias adjustments for manual
control to 0 to 100% output.
|
| Voltage
Protection:
|
a. Metal oxide varistors (MOVs)
provide transient voltage suppression by clamping high voltage
spikes to within the PRV rating of the semiconductors.
b. Standard PRV ratings:
- Units 380 volts and above
- 1200 volts.
- Units 277 volts and below
- 800 volts.
- Higher PRV ratings are available
for specialized applications.
|
| Reference
Supply: |
A 12 volt DC regulated reference
supply, available from the firing circuit, can connect to
a remote potentiometer for manual control of the unit. This
supply is regulated to within ± 1/2 % for line voltage variations.
Maximum current rating from this reference source is 10 milliamperes. |
| Cooling:
|
a. Current sizes 15, 30 and
60 amperes, single phase, and 15 and 30 amperes, three phase,
are convection cooled.
b. Larger current sizes are
forced-air cooled by integral cooling fans. Bimetallic temperature
switches are supplied on all forced-air cooled units with
one normally open contact wired to a terminal block from
each SCR heat sink. As an alternate, normally closed contacts
are available on request.
|
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