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26
GE Zenith Controls
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Entelli-Switch 250 Operation and Maintenance Manual (71
R
-2000)
Standard Transition
Each MX250 microprocessor based ATS controller
requires a relay/transformer box to apply line voltage to
the ATS operator via coil control relays. Also required is
power for the MX150 printed circuit board and an appli-
cation of sensing voltage proportional to line voltage.
This is accomplished by the relay transformer box. This
method of switching operator voltage and applying power
and sensing voltage to the printed circuit board isolates
R/T Box
Primary
1 VA
25 VA
Assembly
Voltage
XFMR
XFMR
Part No.
at 50/60 Hz
Part No.
Part No.
57P-1015
120V
K-3216
K-3224
57P-1016
208-220V
K-3217
K-3225
57P-1017
230-240V
K-3218
K-3226
57P-1018
277V
K-3219
K-3227
57P-1019
380-400V
K-3220
K-3228
57P-1020
416-440V
K-3221
K-3229
57P-1021
460-480V
K-3222
K-3230
57P-1022
575-600V
K-3223
K-3231
Relay/Transformer (R/T Box)
40-225 Amp Molded Power Section
Transformer Usage
(see Figure 12)
Item
Part No.
Description
Qty
1
See Chart
Transformer (1 VA)
2
2
See Chart
Transformer (25 VA)
2
3
K-1274
Relay Flange Mounted
2
Bill of Material
R/T Box
Primary
1 VA
25 VA
Assembly
Voltage
XFMR
XFMR
Part No.
at 50/60 Hz
Part No.
Part No.
50P-1026
120V
K-3216
K-3224
50P-1027
208-220V
K-3217
K-3225
50P-1028
230-240V
K-3218
K-3226
50P-1029
277V
K-3219
K-3227
50P-1030
380-400V
K-3220
K-3228
50P-1031
416-440V
K-3221
K-3229
50P-1032
460-480V
K-3222
K-3230
50P-1033
575-600V
K-3223
K-3231
40-3000 Amp - All Other Standard Types
Transformer Usage
(see Figure 13)
Item
Part No.
Description
Qty
1
See Chart
Transformer (25 VA)
2
2
See Chart
Transformer (1 VA)
2
3
K-1260
Coil Control Relay (24V)
2
Bill of Material
SEC.
PRI.
SEC.
PRI.
SEC.
PRI.
the MX250 from the line voltage, further protecting
the controller from harmful line transients. Two versions
of the R/T box exist depending on the type of ATS
(standard transition or delayed transition).
The following layout drawings of the R/T Box compo-
nents (standard and delayed transition) include a bill of
materials for replacement parts. Schematics are included
to indicate proper wiring.
1
2
(inside)
3
1
2
3
Figure 13
Figure 12
