Rockwell Automation 1608 HC-DySC User Manual, 200 A - Manual (Page 17)

Rockwell Automation Publication 1608P-UM004A-EN-P - September 2013 17
Applying Power and Operation Chapter 4
Bypass Switch Modes The bypass switch has three modes of operation and is configured as shown in
Figure 9 .
Figure 9 - Bypass Switch and Mode Operations.
• NORMAL Mode – Input and output contacts
are closed. Power flows from the utility source
through the DYSC electronics to the load.
• TEST Mode – Bypass contacts and input
contacts are closed. Power flows directly from the
utility to the load through the bypass contacts.
DYSC outputs are not connected to the load.
DYSC electronics have power provided for testing
by a qualified electrician.
• BYPASS Mode – Only bypass contacts are closed. Power flows directly from
the utility to the load. No power is present on DYSC inputs or outputs. DySC
power electronics are isolated for maintenance or repair.
Maintenance Bypass Transfer
Procedure Manual transfer to Bypass (maintenance) mode:
1. Rotate bypass switch to the Test position, then to the Bypass position.
Note: when the bypass switch is in the Bypass position, CBI circuit breaker will open
automatically.
2. Verify the screen on the HC-DySC displays “System Offline” in the upper
left-hand corner of the home page.
3. The HC-DySC is now bypassed and isolated for maintenance.
Manual transfer to Normal (sag protection) mode:
1. Rotate CBI handle to the off/reset position then to the on position. Note:
HC-DySC prevents re-closure of CBI within 1 minute of opening.
2. Rotate the bypass switch to the Test position. ATTENTION: The bypass
contacts are all timed to make-before-break and will not disrupt power to
the load during any mode transitions. The switch has lockout/tagout
(LOTO) provisions. Delay one second from changing from one position
to the next.
3. Verify the screen on the HC-DySC displays “OK” in the upper left-hand
corner of the home page.
4. Rotate the bypass switch to the Normal position.
5. The HC-DySC system is now providing power to the load.