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Chapter 10
Transformers and Shunt Regulators
10-4
Table 10.B shows the nominal resistor power trip levels in watts for the
various switch settings. When shunt requirements exceed the selector
setting, the excess power will cause the bus voltage to rise, resulting in an
overvoltage fault condition and loss of braking.
Table 10.B
Nominal Power Trip Level Reference Data (continuous watts, 10%)*
15A
SW1 Switch
W/ Int. 16 Ohm
Setting
Resistor
0
67
1
71
2
75
3
80
4
85
5
91
6
99
7
107
8
118
9
130
A
145
B
164*
C
189
D
223
E
272
F
347
* Denotes the maximum allowable settings for factory supplied configurations.
ATTENTION: To guard against personal injury and/or
!
equipment damage from an overheated resistor, the designated
duty cycle settings for factory supplied shunt resistor
configurations must not be exceeded. Check the Duty Cycle
Selector Switch (SW1) to ensure that it is set properly before
operation.
ATTENTION: When using a customer supplied external shunt
!
resistor assembly, the Duty Cycle Selector Switch (SW1) must
be set to an appropriate level for that resistor assembly. Consult
the resistor manufacturer for the appropriate derating
guidelines. Failure to comply could result in personal injury
and/or equipment damage from an overheated resistor.
22.5A
22.5A
W/ Int. 12 Ohm
W/ Ext. 9 Ohm
Resistor
Resistor
73
98
77
103
82
109
86
115
92
122
98
130
105
139
113
150
122
163
133
177
146
195
162*
216
183
243
208
277
242
323
290
386*
45A
W/ Ext. 5 Ohm
Resistor
215
227
241
256
274
294
317
344
378
417
466
527
607
715*
872
1115
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