Dynamatic 15-539-14 Instructieblad - Pagina 12

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b. Monitor the motor current. Since current is proportional to torque, check your nameplate for

the rated motor current to determine to desired torque limit. Example- If your drive is rated

at 10 amps, and you want to limit the torque (150% of 10 amperes is 15 amperes), start the

drive and note the maximum current on the ac ammeter during acceleration. If the current is

less than 150% of rated motor torque, increase the Torque Limit setting R19 CW. If the current

rating is too high, decrease the Torque Limit setting CCW. Stop the unit and repeat the Start

Up. Check on the ac ammeter during acceleration. If the motor current during acceleration

never reaches 150% of rated motor current, increase the load and repeat current monitoring.

c. When the clutch is being torque limited, decrease the setting of the Torque Damping

potentiometer R18 CCW until instability (hunting) develops. Then increase the setting CW

until stability is attained. Recheck the Torque Limit setting as described in step 11b and

readjust if necessary.

12.

Torque Limit PCB 15-444-2 (If normal load cannot be applied)

a. Apply a load to the motor and note the motor current (IR) (a load of 50% of full load or more

is desirable)

b. Check the motor nameplate for full load current (IF) of the motor.

c. Connect a voltmeter across terminals 1 and 2 measure the voltage (VR) at a motor current of

IR.

d. Calculate what the voltage would be across terminals 1 and 2 at full load:

VF = Current xfmr output voltage at full load

VR = Current xfmr output voltage at reduced load

IF = Motor current at full load

IR = Motor current at reduced load

e. Disconnect the leads to terminals 1 and 2 on 15-444-2 Modification board and connect a

variac.

Adjust the variac for VF and adjust the Torque Limit pot until the output speed of the drive

just begins to decrease. Increasing the output of the variac slightly will cause the speed of the

drive to decrease sharply. When making this adjustment DO NOT exceed 75 volts out of the

variac.

g. Torque Limit Damping- Follow the procedure outlined in step 11c. Load must be applied, and

the circuit must be limiting torque to make this adjustment.

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