THOMSON TSC 80, Service Manual, Page: 28 / 41

TSC 80 TRANSFER SWITCH CONTROLLER
PM063 Rev 7 09/02/27 Thomson Technology
24
4.1.1.1.TSC 80 UNDER VOLTAGE SETPOINTS WITH NON-STANDARD
SYSTEM VOLTAGES
When the Transfer Switch & TSC 80 transfer controller is applied to non-
standard system voltages, the TSC 80 under voltage potentiometer setting
percentages on the printed circuit board will not correspond to the correct
voltage drop out setting.
To obtain the correct drop-out voltages using non-standard system voltages,
the TSC 80 potentiometers need to have an offset percentage adjustment with
the corresponding Voltage Jumper settings. These are shown in the following
table for typical 85% drop-out under voltage setpoints.
System
Voltage
ATS
Transformer
Tap Setting
TSC 80 Voltage
Jumper Setting 85% Drop-out
Voltage
TSC 80 Under
voltage
Potentiometer
Setting
208V 208V tap No jumper =
208V
177V
85%
220V 240V tap 240V 187V
78%
230V 240V tap 240V 195V 81%
240V 240V tap 240V 204V
85%
440V 480V tap 480V 374V
78%
460V 480V tap 480V 391V 81%
480V 480V tap 480V 408V
85%
575V 600V tap 600V 489V
82%
380V/50Hz
392V tap (use
208V to 600V
primary
connection)
380V 323V 85%
400V/50Hz 392V tap (use
208V to 600V
primary
connection)
480V 340V 71%
To obtain the most accurate setting of the potentiometer (other than visually on the
printed circuit board), a Service Display Module (SDM) is recommended.
For other non-standard system voltages, the following formula can be used:
A) Desired Drop-out Voltage= Drop-out % x System Voltage