Emerson 7ADTB - Manual (Page 5)

INSTALLATION (continued)
1---3
RED
RED GREEN
GREEN
observe
these lights
AMBER
Figure 1-2. Standard controls and indicators.
Functional Test
Read all instructions on the Wiring Diagrams and labels
affixed to the 7ADTB. Note the control features that are
provided and review their operation before proceeding.
After installing the 7ADTB check the following:
– Bypass Handle should be in the NORMAL position.
– Isolation Handle should be in the CONN position.
– CN transfer switch should be C (closed)
– CE transfer switch should be O (open)
If handles are not in correct positions, follow instructions
for Bypassing and Isolating the automatic transfer switch
in Section 3. Do not force the handles. Electrical
interlocks prevent a wrong sequence of operation.
1 – Voltage Checks
First check nameplate on transfer switch; rated voltage
must be the same as normal and emergency line voltages.
Use extreme caution when using a meter
to measure voltages. Do not touch power
terminals; shock, burns, or death could result !
Perform steps 1–6 at the right. Observe the status lights.
See Figure 1–2.
■ Black square means light is on.
❐ White square means light is off.
* If necessary, adjust voltage regulator on generator per the
manufacturer’s recommendations. The 7ADTB will respond only
to rated voltage specified on the nameplate.
Now continue to 2 – Electrical Operation on next page.
1
Close the normal source circuit
breaker. The Transfer Switch
Connected To Normal and the
Normal Source Accepted lights
should come on.
Load
Disconnect
Active
2
Use an accurate voltmeter to
check phase to phase and
phase to neutral voltages pres-
ent at the transfer switch normal
source terminals.
3
Close the emergency source
circuit breaker. (Start generator,
if necessary.) The Transfer
Switch Connected To Normal &
Emergency Source Accepted
lights should come on.
Load
Disconnect
Active
4
Use an accurate voltmeter to
check phase to phase and
phase to neutral voltages pres-
ent at the transfer switch emer-
gency source terminals.*
5
Use a phase rotation meter to
check phase rotation of emer-
gency source; it must be the
same as the normal source.
A B C
6
Shut down the engine–genera-
tor, if applicable. The Emergen-
cy Source Accepted light should
go off. Then put the starting
control selector switch (on the
generator set) in the automatic
position. Close enclosure door.
Load
Disconnect
Active