Kollmorgen Digital MMC Control, Hardware Manual

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Kollmorgen - December 2011 39
MMC Smart Drive Hardware Manual
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SYSTEM POWER DEVICES
4.2 Protection
4.2.1 Motor Overload Protection
The MMC Smart Drive utilizes solid state motor overload protection in accordance
with UL508C that operates:
•
within 8 minutes at 200% overload
•
within 20 seconds at 600% overload
4.2.2 Motor Thermal Protection
The motor may be supplied with one of the following thermal protectors:
•
A thermostat (normally closed, contacts rated at 10ma or greater). The thermo-
stat's contact will open when the motor's maximum operating temperature is
exceeded. Connect the thermostat between 0V and pin 11 of the drive's Feed-
back Connector (F2).
•
A thermistor (Phillips KTY84-130 PTC or equivalent recommended). The motor
manufacturer will provide the motor's maximum operating temperature. This tem-
perature may be entered into the Motor Temperature Parameters in PiCPro. Con-
nect the thermistor output to pin 11 of the drive's Feedback Connector (F2).
4.2.3 230V Smart Drive Protection Requirements
Two types of Protection must be provided in case the Smart Drive malfunctions:
• Short Circuit Protection - this protection helps minimize damage to the Smart
Drive in the case of a Short Circuit condition. Short Circuit Protection is required to
meet UL508C requirements.
• Branch Circuit Over Current Protection - this protection helps minimize damage to
the Smart Drive and helps protect the wiring between the Smart Drive and the
Over Current Protection Device in the case of a sustained Over Current condition.
Over Current Protection must be provided in accordance with NFPA 79 7.2.3 and
7.2.10. Supplemental UL1007 protectors
shall not be used to provide Branch Cir-
cuit Protection.
When using the 230V Smart Drive, the fuse that provides Short Circuit Protection also
provides Over Current Circuit Protection, therefore a separate Short Circuit Protection
fuse is not required.
Two types of fuses are defined for use with the 230V Smart Drive:
Non-restricted - If the Branch Circuit supplying power to the drive is capable of
delivering no more then 5,000 RMS symetrical short circuit amperes (240V
maximum), the fuse type provided for Protection has no “Clearance I
2
t” restrictions,
and must meet the following requirements:
• have a current rating no greater than the “Maximum Fuse Size” in Table 4-2
• have an interrupt capability no less than the short circuit rating (Prospective Short-
circuit Symetrical Amperes) of the Branch Circuit supplying the drive.
Restricted - If the Branch Circuit supplying power to the drive is capable of delivering
between 5,000 and 100,000 RMS symetrical short circuit amperes (240V maximum),
the fuse type provided for Protection has “Clearance I
2
t” restrictions, and must meet
the following requirements: