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WARNING
Be aware that certain automatic start arrangements can engage
the starter/VFD. Open the disconnect ahead of the starter/VFD
in addition to shutting off the chiller or pump. Failure to do so
could result in serious personal injury of death from electric
shock.
WARNING
The main disconnect on the starter/VFD front panel may not
de-energize all internal circuits. Open all internal and remote
disconnects before servicing the starter/VFD. Failure to do so
could result in serious personal injury or death from electric
shock.
Mechanical Starter
1.
Check all field wiring connections for tightness, clearance
from moving parts, and correct connection.
2.
Check the contactor(s) to ensure they move freely. Check
the mechanical interlock between contactors to ensure that
1S and 2M contactors cannot be closed at the same time.
Check all other electro-mechanical devises, such as relays,
for free movement. If the devices do not move freely, con-
tact the starter manufacturer for replacement components.
3.
Reapply starter control power (not main chiller power) to
check the electrical functions.
Ensure the starter (with relay 1CR closed) goes through a
complete and proper start cycle.
Benshaw RediStart MX3 Solid-State Starter
WARNING
This equipment is at line voltage when AC power is connect-
ed. Pressing the STOP button does not remove voltage.
CAUTION
An isolation switch or circuit breaker must be open ahead of
any VFD or solid-state starter when the chiller is in a vacuum.
If not, damage to the machine may result.
1.
Ensure all wiring connections are properly terminated to
the starter.
2.
Verify the ground wire to the starter is installed properly
and is sufficient size.
3.
Verify the motors are properly grounded to the starter.
4.
Verify the proper ac input voltage is brought into the
starter according to the certified drawings.
5.
Confirm the field wiring does not have external power
supply connected to the chiller controls/starter inputs.
6.
Apply power to the starter.
VFD Starter
Use the following instructions to verify the condition of the
installation:
1.
Turn off, lockout, and tag the input power to the drive.
2.
Wait a minimum of 5 minutes for the DC bus to discharge.
3.
All wiring should be installed in conformance with the
applicable local, national, and international codes
(e.g.,NEC/CEC).
4.
Remove any debris, such as metal shavings, from the
enclosure. Metal shavings on power module enclosure will
void drive warranty.
5.
Check that there is adequate clearance around the machine.
6.
Verify that the wiring to the terminal strip and the power
terminals is correct with no external power supplied to the
inputs of the Carrier/starter controls.
7.
Verify that all of the VFD power module circuit board con-
nectors are fully engaged and taped in place.
8.
Check that the wire size is within terminal specifications
and that the wires are tightened properly.
9.
Check that specified branch circuit protection is installed
and correctly rated.
10. Check that the incoming power is within 10% of chiller
nameplate voltage.
11. Verify that a properly sized ground wire is installed and a
suitable earth ground is used. Check for and eliminate any
grounds between the power leads. Verify that all ground
leads are unbroken.
Verify Condition of Installation
Use the following instructions to verify condition of installation:
1.
Turn off, lockout, and tag the input power to the drive.
2.
Wait a minimum of 5 minutes for the DC bus to discharge.
3.
All wiring should be installed in conformance with the
applicable local, national, and international codes
(e.g.,NEC/CEC).
4.
Remove any debris, such as metal shavings, from the
enclosure. Metal shavings on power module enclosure will
void drive warranty.
5.
Check that there is adequate clearance around the
machine.
6.
Verify that the wiring to the terminal strip and the power
terminals is correct.
7.
Verify that all of the VFD power module circuit board con-
nectors are fully engaged and taped in place.
8.
Check that the wire size is within terminal specifications
and that the wires are tightened properly.
9.
Check that specified branch circuit protection is installed
and correctly rated.
10. Check that the incoming power is within 10% of chiller
nameplate voltage.
11. Verify that a properly sized ground wire is installed and a
suitable earth ground is used. Check for and eliminate any
grounds between the power leads. Verify that all ground
leads are unbroken.
Inspect Wiring
Do not check the voltage supply without proper equipment
and precautions. Serious injury may result. Follow power
company recommendations.
Do not apply any kind of test voltage, even for a rotation
check, if the chiller is under a dehydration vacuum. Insulation
breakdown and serious damage may result.
1.
Examine the wiring for conformance to the job wiring dia-
grams and all applicable electrical codes.
2.
On low-voltage compressors (600-v or less) connect a
voltmeter across the power wires to the compressor starter
and measure the voltage. Compare this reading to the volt-
age rating on the compressor and starter/VFD nameplates.
3.
Compare the ampere rating on the starter/VFD nameplate
to rating on the compressor nameplate.
4.
The starter/VFD for a centrifugal compressor motor must
contain the components and terminals required for PIC6
refrigeration control. Check the certified drawings. Note
that the starter/VFD must share control of cooler and con-
denser liquid pumps.
26
WARNING
CAUTION
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