Cooper Lighting S260-75-1 TABLE, High-VoltageSwitch, Output of the Control, Continuity Check of High-VoltageSwitches

Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

TABLE 5

Continuity Check of High-Voltage Switches

Switch	Ohmmeter Reading
Receptacle
Pin	Switch Open	Switch Closed
Type VR, VLR, VRV — Standard Operator
B to C	Motor	∞
B to D	∞	Trip Coil
B to E	∞	0
D to F	0	0
Type VR, VLR, VRV — Quick Close Operator
A to D	*	∞
B to C	Quick Close Coil	∞
B to D	∞	Trip Coil
B to E	∞	0
D to F	0	0
Type TSC
B to C	Motor	∞
B to F	∞	Motor
B to E	∞	0
D to F	0	∞
Type PST-6 with C Interrupter #1
E to R	Close Coil	∞
M to N	∞	0
P to E	*	∞
S to V	0	∞
T to U	∞	Trip Coil
Type PST-6 with C Interrupter #2
B to C	∞	0
D to E	*	∞
E to F	Close Coil	∞
G to K	0	∞
H to J	∞	Trip Coil
Type PST-9 with C Interrupter #1
E to F	∞	∞
A to C	∞
C to E		∞
B to C
C to D		∞
Type PST-9 with C Interrupter #2
L to M	∞	0
G to J	0	∞
J to L	∞	Trip Coil
H to J	*	∞
J to K	Close Coil	∞

*Will read motor resistance if closing spring is not charged, will read infinity if closing spring is charged.

Output of the Control

To determine if the problem is in the control or the high- voltage transfer switch, proceed as follows:

1.Disconnect the switches from the control.

2.Place OPERATION SELECTOR switch (S3) to

MANUAL.

3.Place SOURCE PREFERENCE and RETURN MODE switch (S4) to NO PREF.

4.With the control energized, check the voltage to ground at the “Transfer Switch Operators” terminal board, TB1, per Table 6.

5.If these output voltages are obtained, check the high- voltage switch. If the output voltages are not obtained, check the manual control functions.

High-Voltage Switch

Normal control output at TB1 but failure to operate suggests a malfunctioning switch.

1.With an ohmmeter, check the resistance between points of the high-voltage switch actuator per Table 5.

2.If the control circuit of the switch operator checks out, the trouble may be mechanical. Refer to the mainte- nance manual for the switch.

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