Motor Checks - Parker 590+ DRV Product Manual

7-28
Trips and Fault Finding
Use the tables below to determine which SCR pack is bad. The tables show the SCR being tested and the SCR pack that contains it. Measure the
resistance between each armature and supply terminal. A good SCR will measure greater than 1MΩ when read from the armature to the supply
terminal. Reverse the leads and repeat these measurements between the supply and armature terminals. Bad (shorted) SCRs should measure 0 to 1kΩ.
Remove the power supply board and measure the resistance between the gate and the cathode. It should measure between 18 and 40Ω if good. A
schematic of the SCR pack is shown above. The outer most terminals connected to yellow leads at the bottom of each SCR pack are the thyristor gate
terminations.
Non-regenerative Drives
Terminal
A+
A-

Motor Checks

Several alarm messages are caused by problems with the motor. Most motor problems relate to insulation breakdown, overtemperature and armature
brush and commutation problems. Check the motor armature and field with a megger to ensure that the motor winding insulation has not degraded and
shorted one conductor to another or to ground. Continuity checks require an ohmmeter for determining whether motor windings or leads have opened
or shorted. Continuity measurements should be least the 1Ω. Insulation measurements should be greater than 10MΩ.
IMPORTANT
Armature resistance for motors less then 10Hp (7.5kW) can measure up to 3
Also check the motor commutator for flashover. Clean the commutator and motor brushes if worn or dirty. If the motor is fitted with a blower, change
or clean the blower filter regularly.
L1 L2 L3
T1 (A) T3 (B) T5 (C)
T4 (A) T6 (B) T2 (C)
Disconnect the motor leads from the drive before using a megger to check for motor ground faults.
Regenerative Drives
Terminal L1 L2
A+ T1/T10 (D) T3/T12 (E)
A- T4/T7 (A) T6/T9 (B)
Caution
L3
T5/T8 (F)
T2/T11 (C)
Ω
.
DC590+ DRV Series DC Digital Drive