I.B. ATS-CP01
Page 21
Effective 5/98
6.2.1 TRANSFER SWITCH APPEARS INOPERATIVE
Step 1: Verify that all plugs and sockets are properly
interconnected.
Step 2: Verify that the correct system voltage appears
at NORMAL switch. Measure the voltage at the
breaker lugs.
Step 3: Verify that the voltage selection plug is in the
proper position to match the system voltage.
Step 4: Look for any obviously burned components.
Determine the cause and rectify, if possible.
Replace defective components after the cause
is determined.
Step 5: Refer to Figure 5-2 for manual operating
instructions. Verify whether or not thesystem
voltage now appears on the load terminals.
If YES: Proceed to check logic for problems
in respective logic instruction book.
If NO:
Check all power connections and
the switching mechanism.
6.2.2 TRANSFER SWITCH WILL NOT AUTOMATI-
CALLY TRANSFER TO NORMAL
Step 1: Check for proper line voltage on N1, N2, N3.
Step 2: Is the normal switching device charged?
If YES:
Continue with other procedures.
If NO:
Go through section 6.2.4 first before
continuing.
Step 3: Is the emergency switch OPEN?
If YES:
Proceed to Step 5.
If NO:
Proceed to Step 4.
Step 4: Measure voltage between terminals A9 and A8
on the emergency switching device (shunt trip).
Does the voltage measure 120 VAC ±10 volts?
Record reading.
If YES:
Check shunt trip in emergency switch.
If NO:
Check wiring to A9 and A8.
Step 5: Measure voltage between terminals A1 and A2
on the normal switching device (spring release
coil). Does the voltage measure 120 VAC ±
10 volts? Record reading.
If YES:
Check spring release coil in normal
switching device.
If NO:
Check wiring to A1 and A2.
6.2.3 TRANSFER SWITCH WILL NOT AUTOMATI-
CALLY TRANSFER TO EMERGENCY
Step 1: Check for proper line voltage on E1, E2, E3.
Step 2: Is the emergency switching device charged?
If YES:
Continue with other procedures.
If NO:
Go through Section 6.2.4 first before
continuing.
Step 3: Is the normal switching device OPEN?
If YES:
Proceed to Step 5.
If NO:
Proceed to Step 4.
Step 4: Measure voltage between terminals A9 and A8
on the normal switching device (shunt trip).
Does the voltage measure 120 VAC ± 10 volts?
If YES:
Check shunt trip in normal switch
If NO:
Check wiring to A9 and A8.
Step 5: Measure voltage between terminals A1 and A2
on the emergency switching device (spring
release coil). Does the voltage measure 120
VAC ± 10 volts? Record reading.
If YES:
Check spring release coil in emergency
switch.
If NO:
Check wiring to A1 and A2.
6.2.4 TRANSFER SWITCH WILL NOT AUTOMATI-
CALLY RECHARGE SWITCHES
Step 1: Measure the voltage between the terminals A6
and A2 on the switching device that does not
automatically recharge. Does the voltage read
120 VAC ± 10 volts? Record reading.
If YES:
Check electrical operator inside the
switching device.
If NO:
Verify wiring to A6 and A2.
Step 2: If problem persists contact Cutler-Hammer.
