WARNING
DISCHARGE TIME
The adjustable frequency drive contains DC link
capacitors that can remain charged even when the
adjustable frequency drive is not powered. Failure to
wait the specified time after power has been removed
before performing service or repair work could result in
death or serious injury.
1. Stop the motor.
2. Disconnect AC line power, permanent magnet
type motors, and remote DC link power
supplies, including battery backups, UPS, and
DC link connections to other adjustable
frequency drives.
3. Wait for the capacitors to discharge fully before
performing any service or repair work. The
duration of waiting time is specified in
Table 2.1.
Voltage [V] Minimum waiting time (minutes)
4 7 15
200–240 0.34–5 hp
[0.25–3.7 kW]
7.5–50 hp
[5.5–37 kW]
380–500 0.34–10 hp
[0.25–7.5 kW]
15–100 hp
[11–75 kW]
525–600 1–10 hp
[0.75–7.5 kW]
15–100 hp
[11–75 kW]
525–690 2–10 hp
[1.5–7.5 kW]
15–100 hp
[11–75 kW]
High voltage may be present even when the warning LED
indicator lights are off.
Table 2.1 Discharge Time
WARNING
LEAKAGE CURRENT HAZARD
Leakage currents exceed 3.5 mA. Failure to ground the
adjustable frequency drive properly can result in death
or serious injury.
•
Ensure the correct grounding of the equipment
by a certified electrical installer.
WARNING
EQUIPMENT HAZARD
Contact with rotating shafts and electrical equipment
can result in death or serious injury.
•
Ensure that only trained and qualified
personnel perform installation, start-up, and
maintenance.
•
Ensure that electrical work conforms to national
and local electrical codes.
•
Follow the procedures in these document.
WARNING
UNINTENDED MOTOR ROTATION
WINDMILLING
Unintended rotation of permanent magnet motors can
result in serious injury or equipment damage.
•
Ensure that permanent magnet motors are
blocked to prevent unintended rotation.
CAUTION
INTERNAL FAILURE HAZARD
An internal failure in the adjustable frequency drive can
result in serious injury when the adjustable frequency
drive is not properly closed.
•
Ensure that all safety covers are in place and
securely fastened before applying power.
Safety Instruction Manual
MG33AP22 Danfoss A/S © Rev. 09/2014 All rights reserved. 9
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