PowerWalker VFI 20000-40000TAP 3/3 BI, User Manual

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4-11
4.5.2 Installing Parallel Pull Chain and CAN Control Wiring and Connections
To install wiring:
1. Verify the UPS system is turned off and all power sources are removed. See Chapter 6, “UPS Operating
Instructions", for shutdown instructions.
2. Installing Parallel system, see Figure 4-10 and Figure 4-12.
3. To locate the appropriate terminals and review the wiring and termination requirements, see
paragraph 3.2.3, Table 4-2, Figure 4-7, Figure 4-9, and Figure 4-10.
Figure 4-10. Pull Chain Terminal Block Connector Assignments
Table 4-2. Pull Chain Connections
Pull Chain Terminal Name Description
1 Pull Chain +
Output: Backup control for parallel operation.
2 Pull Chain –
Pull Chain
CAUTION
• Parallel system combined input and output cable length should be in accordance with the
following rule. It should be designed to ensure that wiring impedance from point of supply to
UPS input and from UPS output to load connection for each UPS module in a multi-module
system is equal, or within a tolerance of approximately ±10%. This is to ensure approximately
equal current sharing when in static bypass mode and restrain input/output high frequency loop
current of parallel system. Suggest that parallel system combined input and output cable length
no less than 10m, 5m for input and 5m for output.
Total length of 1A =2A=3A=4A
1B=2B=3B=4B
1C=2C=3C=4C
• If installing only two UPS modules (redundant), this requirement is no longer required as each
UPS is capable of supporting the full bypass requirement. However, this would preclude future
expansion.
• Ensure that each UPS static bypass is fed from a single common source, as is an external
bypass switch if installed. If each UPS is fed with a separate rectifier source, please consult for
advice on compatibility.
RJ-45 Controller Area Network (CAN) must be supplied by the customer.
NOTE