Troubleshooting E53 Fault - Hitachi P1 Basic Instruction Manual

TR OUB LE S HO O TIN G E 5 3 F AU L T
WHAT IS AN E53 FAULT - An E53 fault is a over-torque fault.
HOW IS AN E53 FAULT DETERMINED – When the VFD is opera�ng in a control mode of (AA121 = 8, 9, or 10) the VFD will use the
torque monitor to determine if the output torque becomes greater than the values in over-torque level parameters CE120 –
CE123. If the output torque becomes greater than the over-torque levels, then an E53 over-torque fault is determined to occur.
• Check the encoder sha� collar is �ght on the sha� and the encoder tether is secure.
• Check output torque monitor dA-17 without weight suspended from the hook and see if the torque is abnormally high, this
might point to an issue with the output of the VFD or the motor.
Check to see if the motor brake is releasing correctly.
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Check the over-torque levels in parameters CE120 – CE123, the normal values are 205% unless changed in the field. Make
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sure they are not set lower than the required torque during driving (be sure to include the torque spike during
accelera�on).
If the fault is occurring at start you will need to determine if the encoder is working. To do this remove the encoder from
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the motor sha� and navigate to VFD parameter dA-20 the current posi�on monitor. With the encoder in your hand rotate
the encoder sha� and see if the pulse count is changing either coun�ng up or coun�ng down. You can also navigate to VFD
parameter dA-08 and rotate the encoder sha� and see if there is any frequency being detected.
If a load is stuck in the air, you can change the VFD control mode to open loop SLV AA121 = 08 for the purpose of lowering
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the load. DO NOT keep using the hoist in open loop mode if it is a closed loop hoist since the safety protec�ons will be
disabled.
If this fault is occurring at random check to make sure the motor brake circuit is not dropping out randomly. Check to see if
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the encoder signal in unstable by using dA-08 detected speed monitor, this value while run should be close to the set-
frequency value. The allowable tolerance for dA-08 is + / - 1.5hz from the commanded frequency.
Contact Detroit Hoist for further assistance.
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12/17/2018 Hitachi P1 Closed Loop Hoist Basic Instruc�on Manual Firmware V19 – V25 20