7.3.2. Diagnostic Displays on the Drive Modules
The diagnostic displays are only valid if the lamp „24V, plus/minus +15V" is lit up
(1) = does not apply to KDS1 and the older units of the types
TDM1, TDM2 with serial numbers below SN 233 .....,
TDM3 with serial numbers below SN 240060-...
TDM4 with serial numbers below SN 240062-...

+24 V, ±15 V
With fault -> off
Control voltage for signal electronics disrupted, or outside of tolerance (the values must range as follows: plus/minus 15V: 14.75 ... 15.25 volts, 24 V: 22.5 ... 32 volts).
After the fault has been eliminated, press the black reset button on the front of the diagnostics display to re-start. All other diagnostic messages are invalid if this LED is either flashing or lit up!
Possible fault causes and measures:

– No mains auxiliary voltage at input of the supply module
-> Check mains connection (open circuit, switching contact defective)
-> Check connection and controller of the mains auxiliary voltage between mains and supply module.

– Loose or defective bus cable connection X1
-> Bus cable X1 must be firmly plugged in, exchange if defective.

– Short-circuit in at least one of the connected drives (in drive module, feedback cable, or motor feedback)
-> Remove the individual connections (bus connection X1, feedback cable, wiring to the terminal strip), and then
-> measure the 24V, +15V voltage at the connecting points of the terminals in an effort to locate the fault (generally short-circuit).

– Response during operation: The maximum load of the control voltage +15 V or 24 V is being exceeded.
-> Check the current load from the connected drives in accordance with the data sheet (current consumption).
– Defective fuse in supply module
-> Check fuse
-> If fault still present, locate overload at the 24 volts or in the fans and eliminate.
-> Put in new fuse

BLC 1
BLC 2
BLC 3
Rotor position signals:
Only one or two diagnostic lamps should light up simultaneously during a shutdown or when the speed is low. The lamps blink at low speed. All three lamps appear to be lit up simultaneously at high speeds.

Fault:
A fault is present if all three lamps are simultaneously lit up during shutdown or with low speeds.
Checking procedure:
– Switch power to mains off (disconnect mains contactor). Switch only mains auxiliary voltage/control voltage on at supply module.

– Disconnect motor cable from motor.

– Release brakes.

– Pull motor shaft through by hand and check all 6 states for correctness, in acc. with Fig. 80.

Possible fault causes and measures:

– Faulty connection of the feedback cable to the drive module
-> check connection

– Fault in motor feedback cable
-> exchange cable

– Fault in the motor feedback-> measure plus/minus 15 volts voltage of the motor feedback -> exchange motor

– Fault in drive module
-> Exchange unit

Tacho
With fault -> off
Interference in tacho signal or signals BLC1, BLC2, BLC3 (1).
After the fault has been cleared, press the black reset key on the front of the diagnostics display to re-start.
Possible faults causes and measures:

– Faulty connection or break in the motor feedback cable
-> check feedback connection
-> exchange feedback cable

– Excessive motor speed
-> check feedback connection
-> exchange feedback cable

– Motor feedback defective
-> exchange motor

– Servo drive module defective
-> exchange unit

– Fault in BLC signals
-> check BLC signals, as described in LED LBC1, BLC2, BLC3.

Power or PWR
With fault -> off
No power applied or power disrupted.
Possible fault causes and measures:

– Link circuit busbars not sufficiently or not at all screwed in. Green lamp „power OK" on the supply module is lit up.
-> Check the fit of the link circuit busbars

– Link circuit throttle connection of the supply module (if present) not allocated
-> Check whether the throttle at the link circuit throttle connection terminals 1L+, 2L+, 1L-, 2L- are properly connected, or whether there is a wire strap present.

– No mains voltage
If green lamp „power OK" at the supply module not lit up,
-> check 3-phase mains voltage connection. (Look for fault between mains connection and supply unit.)
-> Check the controller of the mains contactor.

– Mains voltage lacks phase:
-> check 3-phase mains voltage at the supply module and re-measure,
-> check link circuit short-circuit,
-> check mains fuse.

– Only applies to KDV2, KDV3 and KDV4:
No right rotational field (fault only occurs with first connection of machine or drive to the mains).
-> Check the rotational direction at connecting terminals L1, L2, L3 of the supply module (e.g., using rotational field measuring device, or check phase sequence with an oscilloscope). If there is no right rotational field, exchange leads L1 and L2 at the supply module. Attention must be paid that mains auxiliary voltage connections L1 or L2 remain inphase with power connections L1, or L3 of supply module KDV, in accordance with the connection plan! – Mains voltage too low
-> Measure mains voltage at connection terminals L1, L2, L3 of the supply module.
-> Faulty transformer connection or fault in mains

– Supply module defective
-> Disconnect link circuit busbars and bus cable X1 between supply module and drive modules and repeat the above check. If there is no fault now, and the LED „power OK" of the supply module is lit up, then the fault is in the connected drive module.
-> Exchange supply module.

RF
With fault -> off
Controller release not applied to terminal RF
With fault -> flashes (1)
Drive is interference free, but locked internally as there is no power voltage
Possible fault causes and measures:
LED flashing:
see above under LED „power"/"PWR"
LED off:
If message „power" / „PWR" lit up, then it should be possible to operate the drive after controller enable signal (3.30 volts) is input at terminal RF. Otherwise there is a fault in the drive.
-> Measure voltage terminal RF

Bb
With fault -> off
The drive is not ready to operate. Bb contact of the drive module is open.
With fault -> flashes (1)
No power voltage, drive interference-free
Possible fault causes and measures:
– No power voltage
-> see LED „power"/"PWR"
– Fault in drive
-> see which LEDs display fault „plus/minus 15V, 24V", „tacho", „TS", „BS", „TÜ".

TS
With fault -> flashes (1)
Temperature pre-warning, maximum equipment temperature exceeded. Drive to shut down in 30 seconds.
With fault -> on
Shutdown due to excessive equipment temperature.
After fault has been recovered, press the black reset key on the front of the diagnostics display to re-start.
Possible fault causes and measures:

– Fan not working or air inlet or outlet obstructed.
-> Check fan
-> Check fan fuse

– Inside temperature of control cabinet too high (ambient temperature)
-> Improve control cabinet ventilation/cooling

– Load cycle of the drive too high
-> Increase break times or reduce load

– Wrong programming module MOD plugged in
-> Check the data on the rating plate for agreement

TÜ
With fault -> off
Temperature pre-warning that equipment temperature has already been exceeded.
The temperature monitoring opens (only in the KDS).
The "open" collector output temperature monitoring (only in TDM3 and TDM4) switches to low-impedance 0 volts. Should the drive load not be sufficiently reduced within the next 30 seconds, then the drive package will be switched off.
Possible fault causes and measures:
see above under LED „TS"

BS
With fault -> on
Shutdown due to (even short-term) overcurrent, short-circuit or ground leak (1) in the drive module, cable or motor.
After fault has been recovered, press the black reset key on the front of the diagnostics display to re-start.
Possible fault causes and measures:

– Overcurrent when drive is run
-> Hit reset key once, input speed set point to zero and turn drive on with signal at terminal RF:
If fault does not occur again immediately, then there was an overcurrent during the run of the drive. In this case, check to see whether the motor and controller types listed on the rating plate of programming module MOD have actually been built-in.

NOTE: In this case do not repeatedly hit the reset, as this might otherwise cause further damage to motor and drive modules. Fault should continue to be localized and all components tested first:

– Short-circuit or ground leak in cable or connection
-> Test connection and cable, exchange if necessary.

– Short circuit or ground fault in motor
-> Check the motor for a short-circuit or ground leak, exchange if necessary. Should the fault occur again after the reset has been hit, then the drive module is defective.
-> exchange drive module