Chapter 8
Troubleshooting
Page 138 DM55 DynaDrum PP V6, Manual No.21-18, Rev.2.19
8.8 Motor Speed Control Drive
The Motor Speed Control is mounted on the divider panel within the electronics
compartment of the ASU. This variable‐frequency drive is factory‐set and normally does
not require adjustments. The following is a list of parameters that Dynatec programs to
optimize performance, but which differ from the drive's default parameters.
Parameter Value Description
B1-17 01 Starts the motor even when the enable signal precedes power up.
C1-01 3.0 The time it takes to ramp the pump speed up from 0 to maximum.
C1-02 1.0 The time it takes to ramp the pump speed down from maximum to 0.
C6-02 3 Carrier Frequency 8kHz.
E1-04 62* Calibrates the maximum speed. See note below for details.
E1-08 16.0 Middle Output Frequency Voltage.
E1-09 2.0 Allows the motor turn down to 1% minimum.
E1-10 9.5 Minimum Output Frequency Voltage.
E2-01
Full load amperes, maximum motor current.
L1-01 02 Prevents false tripping at low speeds.
L2-01 02
Does not stop the motor when under-voltage is detected (power up
after short interruption).
H2-01 10e Alarm output on fault, inverted
* Due to component tolerances, the maximum speed of the pump might vary. In order to calibrate the
maximum speed, parameter E1-04 can be fine-tuned. Valid range is 61 to 63. Set motor speed to
100%and adjust parameter E1-04 so that the pump is turning exactly 90rpm.
Layout of Motor Control Drive
Acceleration and Deceleration Times
The acceleration and deceleration times are factory set to
10 seconds. If an application requires faster acceleration/
deceleration, corresponding parameters can be changed.
Corrupted Memory
If the memory becomes corrupted:
1. Restore the factory default settings by entering 2220 at
parameter A1-03.
2. Re-enter the ITW Dynatec parameters specified in the
chart at the top of this page.
S1 S2 S3 S4 S5 SC A1 +V AC AM AC
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