(µMOTOR) Technical Manual - PBSI Group Ltd
(µMOTOR) Technical Manual - PBSI Group Ltd
(µMOTOR) Technical Manual - PBSI Group Ltd
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mMOTOR TECHNICAL MANUAL<br />
16.1.5. Too Many Starts.<br />
The MVP will inhibit and can be configured to indicate as a result of too many starts<br />
occurring. It is often desirable to prevent multiple starts of a drive particularly if it is the<br />
cause of stability problems on the power system.<br />
No reset type is available. The inhibit will auto-reset after the selected time delay has<br />
elapsed. A start can then be made.<br />
Starts per Period.<br />
The number of allowable starts before actively inhibiting further starts from being made.<br />
Start Inhibit Time.<br />
The start inhibit time can be set as a fixed time for the inhibit to be active.<br />
Start Period.<br />
The Start period can be set from 1 minute to 60 minutes.<br />
Start Inhibit Type.<br />
This setting selects the time length for the inhibit, there are three options.<br />
1) Inhibit Time (start inhibit time setting)<br />
2) Remaining SP (the remaining start period)<br />
3) SP + IT (the remaining start period + the fixed Inhibit Time)<br />
Example 1.<br />
A Motor can be started a maximum of 4 times in one hour. We can further say those<br />
starts must be evenly spaced throughout the hour.<br />
The Start Period should be set to 15mins with a Starts per Period of 1. The Start Inhibit<br />
Type should be set to Remaining SP.<br />
If the drive starts and runs for 10 minutes and is then stopped, the inhibit will last for 5<br />
minutes.<br />
(Start Period = 15mins) – (run time = 10mins) = (Remaining SP = 5mins)<br />
If the drives starts once and runs for 15mins a second start can be made immediately.<br />
Example 2.<br />
A Motor can be started three successive times within 20mins, if three starts are made<br />
the drive should be inhibited for a period of 30 minutes.<br />
The Start Period should be set to 20mins with a Start per Period of 3. The Start inhibit<br />
Type should be set to Inhibit Time with a Start Inhibit Time setting of 30mins.<br />
If the drive starts and stops three times within 20mins the fourth start can only take place<br />
after the 30mins from the last stop.<br />
If the drive starts twice and continues to run as long as the total time for the two starts is<br />
in excess of 20mins, the drive can be restarted again immediately.<br />
P&B Engineering Issue 6 25/04/2005 Page 45
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