68 Unidrive M702 Getting Started Guide
Issue Number: 4
The thermal memory protection complies with UL requirements for shutdown, loss of
power and speed sensitivity.
For a full explanation of the thermal protection system refer to the Drive User Guide.
In order to comply with UL requirements for thermal memory retention it is necessary to
set the Thermal Protection Mode (Pr 04.016) to zero; and the Low Speed Protection
Mode (Pr 04.025) must be set to 1.
10.2.3 Use with motors with thermal protectors
The drive is provided with a means to accept and act upon a signal from a thermal sensor
or switch imbedded in the motor or from an external protective relay. Refer to the Drive
User Guide for further information.
10.2.4 Specific overcurrent protective device
The drive is not required to be connected to a supply source with a specific overcurrent
protective device other than those specified in section 2.3 Ratings on page 10.
10.3 Short-circuit protection for branch circuits
10.3.1 Short-circuit rating
The drive is suitable for use on a circuit capable of delivering not more than 100,000 RMS
symmetrical amperes, 600 Vac maximum, when protected by the overcurrent protective
devices as described in section 2.3 Ratings on page 10.
Unless otherwise indicated in the Drive User Guide, branch fuses may be any UL listed
class CC, J or T rated 600 Vac.
Unless otherwise indicated in section 2.3 Ratings on page 10, circuit breakers may be
any UL listed type with category control number DIVQ or DIVQ7, rated 600 Vac.
10.3.2 Solid state short-circuit protection
The drive is provided with solid state short-circuit protection. Integral solid state protection
does not provide branch circuit protection. Branch circuit protection must be provided in
accordance with the National Electrical Code and any additional local codes.
10.3.3 Short circuit protection for branch circuits (group installation)
Frame sizes 3, 4, 5 and 6 are approved for motor group installation on a circuit capable of
delivering not more than 100,000 RMS symmetrical amperes, 600 V max, when protected
by class CC, J, T or HSJ fuses.
10.3.4 Common DC bus systems
Frame sizes 3, 4, 5 and 6 are approved for use in modular drive systems using a common
DC bus.
For permitted combinations of converter and inverter, along with the required branch
circuit protection, contact Control Techniques.
10.4 Control circuit protection
10.4.1 Control circuit wiring
All control circuits are located in limited voltage, limited current isolated secondary
circuits. Additional wiring protection is not required.
10.4.2 Supplemental fuse
When the control circuits are supplied with an external 24 V supply, a supplemental fuse
is required as described in the Drive User Guide.
Unidrive M702 Getting Started Guide English iss3.book Page 68 Friday, August 29, 2014 2:33 PM
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