Description
TWRF1 SCR Power Controller
4
Ametek HDR Power Systems
Rev 2
Table 1.1 kVA vs. Impedance
Impedance
Current Rating
4%
6%
8%
10%
12%
kVA
30 Amps
9
13
17
22
30
40 Amps
9
13
17
22
30
60 Amps
9
13
17
22
30
120 Amps
19
32
40
54
60
225 Amps
37
57
95
107
120
1.5
Specification
Specifications for the TWRF1 SCR power controller are given in Tables 1.1 and 1.2.
Table 1.2 TWRF1 Model Number Breakdown
TWRF1 – 480 – 120 – NO – ER – 01
NOTE:
N.C. Thermostat is included in current ratings above 60 A.
1.6
Option ER (Extended Ramp)
The options limits the rate at which the output can increase to prevent high inrush currents with
transformer coupled loads or high cold-to-hot resistance ratios such as tungsten heating elements
The rate of increase is limited to approximately 100% over four seconds. The standard extended ramp
time is 12 cycles.
1.7
Additional Options
The options described above are the ones most commonly used. Additional options are available. For
more information, contact Ametek HDR Power Systems.
120 Vac -
120
240 Vac -
240
400 Vac -
400
480 Vac -
480
575 Vac -
575
30 A rms -
30
40 A rms -
40
60 A rms -
60
90 A rms -
90
120 A rms –
120
225 A rms –
225
N.O. Thermostat -
NO
N.C. Thermostat -
NC
Extended Ramp -
ER
Can have multiple selections
4-20 mA -
01
0-10 Vdc -
02
0-5 Vdc -
03
Auto/Man -
04
Manual Pot input -
05
Others -
xx
Summary of Contents for TWRF1 SCR Series
Page 6: ...Table of Contents TWRF1 SCR Power Controller iv Ametek HDR Power Systems Rev 2...
Page 8: ...Safety Instructions TWRF1 SCR Power Controller 2 Ametek HDR Power Systems Rev 2...
Page 12: ...Description TWRF1 SCR Power Controller 6 Ametek HDR Power Systems Rev 2...
Page 16: ...Operation TWRF1 SCR Power Controller 10 Ametek HDR Power Systems Rev 2...
Page 22: ...Operation TWRF1 SCR Power Controller 16 Ametek HDR Power Systems Rev 2...
Page 35: ...Notes...
Page 36: ...530 Lakeview Plaza Blvd Ste C Worthington Ohio 43085 USA...
