Rockwell Automation Publication 6000-UM002G-EN-P - August 2022
27
Chapter 2 Drive System Layout
Interlocking
Each cabinet door that allows access to medium voltage components is
lockable. Access to the medium voltage areas of the drive is restricted by the
use of key interlocking for safety.
At installation, the key interlocking is set up so that access to the medium
voltage compartments of the equipment can only be made when the upstream
power is locked in the off position. Additionally, the key interlocking prohibits
the upstream power being applied until the medium voltage drive’s access
doors have been closed and locked shut. It is the responsibility of the installer
to verify that the key interlocking is installed properly to the upstream
equipment.
To use the key interlocking safety feature:
1. The circuit breaker must be in the closed state and the circuit breaker
lock must be locked using interlocking key “KA”.
2. Remove key “KA” and insert it into the key interlock that is on the right
door of the isolation transformer cabinet.
3. Rotate key “KA” to unlock key “KB”. You can now remove key “KB”.
Interlocking key “KB” is used to open the left door of the isolation transformer
cabinet, or the left and right doors of the power module cabinet.
Figure 19 - Deadbolt Assembly Mounted to Door
1. Lock out and isolate the drive from medium voltage. Verify with a hot
stick that there is no medium voltage present.
2. Determine that the key interlock is correctly aligned by securely bolting
the medium voltage doors of the cabinet closed and removing from the
lock. The key should turn easily; if any force is required to turn the key,
the deadbolt alignment requires adjustment.
3. Open the doors of the cabinet and inspect the key assembly. Place high
visibility grease on the pins of the dead-bolt counterpart. The factory
recommends using yellow torque sealant, however if it is unavailable
almost any grease will do (See
).
ATTENTION:
Servicing energized industrial control equipment can be
hazardous. Severe injury or death can result from electrical shock, burn, or
unintended actuation of control equipment. Hazardous voltages may exist in
the cabinet even with the circuit breaker in the off position. Recommended
practice is to disconnect or lock out control equipment from power sources,
and confirm discharge of stored energy in capacitors. If it is necessary to
work in the vicinity of energized equipment, the safety-related work practices
of NFTA 70E, Electrical Safety requirements for Employee Work places, must
be followed.
Grease marks from
deadbolt pins
Adjust deadbolt counterpart so that grease
marks from pins hit here
