4.3.1 Short Circuit Protection
For “class 2 coordination”, protect the starter against a short circuit by thyristor Protection Fuses for I²t
and fuses as in dictated in the following table:
Notes:
1. The above table is for maximum starting current of 400% of FLC, maximum starting time
of 5 sec and rated voltage up to 690V V.
2. Rating may change with different external conditions such as ambient temperature, forced
cooling etc. Refer to fuse manufacturer catalogs to confirm correct values.
4.3.2 Transient Protection
Line transient voltages can cause a malfunction of the starter and damage to the thyristors. All RVS-DX
starters incorporate Metal Oxide Varistors (MOV) to protect from normal line voltage spikes.
When higher transients are expected, additional external protection should be used (consult factory).
4.3.3 Control Supply (Terminals A1, A2)
220-240V or 110-120V, 50/60Hz is required to power the electronic circuitry and the bypass. Factory set
value is indicated on the starter’s side label.
This voltage can be from a grounded or ungrounded mains system.
In models up to 310A, voltage level 110V /220V can be changed in the field. (Refer to section
8.1 on
page 49)
4.3.4 Start/Stop (or
4.3.4momentary start) Input (terminal B1)
Input from a maintained contact. Close contact between A2 and B1 to soft start the motor.
To stop the motor open the contact.
If Deceleration time is set to a value other then 0 seconds the motor will soft stop.
If Deceleration time is set to 0 seconds the motor will stop immediately. (Refer to section
7.6.5 on page
35)
If Aux Input is set as Start / Stop, then terminal B1 is used as momentary N.O. Start input and input C1 is
used as maintained N.C Stop input. (Refer to section
7.6.9 on page 42)
For emergency stop of the motor disconnect control voltage from A1, A2 terminals.
RVS-DX
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