Parallel & Three-Phase Connections; Parallel Operation; Three-Phase Connection Operation - Emerson SolaHD MCR Hardwired Serie Mode D'emploi

5.0 Parallel & three-Phase Connections

5.1 Parallel operation

Units of the same SolaHD catalog number may be connected in parallel to obtain a larger load capacity. Both
input and output connections must be made in parallel (see Figure 11). The SolaHD catalog number must end
in -8 or -C8 and must be larger than 1 kVA. No portable units can be paralleled.
All input and output paralleling wires must be tied together in an external paralleling "box" provided by the
user. Do not attempt to jumper the wires of one unit to the terminal block of the other unit. The terminal
block may not be rated to carry the total currents of both units. The input of each unit must be properly and
separately fused.
CAUtIon! Failure to adhere to these requirements may damage the windings.
For units smaller than 5 kVA: When connecting in parallel the 208 Volt windings, other output voltage ratings
(120 V, 240 V) can't be paralleled at the same time and vice versa. It is suggested that the installer remove X2
grounding on each unit, then connect X2 from each unit to one location and ground at that location only.

5.2 three-Phase Connection operation

Loads requiring 4-wire WYE connection may be served by three ferroresonant power conditioners with the
same SolaHD catalog number. The inputs must be connected in Delta. Input fuses must be connected in the
primary of each unit, not in the three-phase lines. The outputs must be connected in WYE with the neutral
solidly connected to a WYE load. Alternatively, these three outputs may serve three independent single-phase
loads. Phase angles may vary somewhat from 120 degrees even with balanced loading.
This circuit arrangement is not intended to serve single-phase line-to-line loading or three-phase Delta
loading. Outputs must serve three independent, single-phase loads of the same total Volt-Amphere (VA)
rating. Connections should be made in one of two ways as shown in Figure 11.
The outputs of the unit are isolated from the input lines. Voltage generated by internal leakage currents will
occur with respect to ground, which can have undesirable effects in electronic equipment. Therefore, if circuit
"B" is used, it is suggested that the installer remove X2 grounding on -8 units, then connect all X2 from each
phase to one location and ground at that location only. This is not required for circuit "A" and will not affect
regulation or the ability to reject power line noise or transients. s.
FIGURe 11
B
A C
CV CV CV
Trans Trans Trans
Load Load Load
(A) Isolated Single-Phase Loads
A B C
CV CV CV
Trans Trans Trans
Load Load Load
(B) Separte Single-Phase Loads
In Grounded WYE
MCR Hardwired Series – 50 Hz & 60 Hz
Unit A
Input
Ac Single-Phase
Input
Unit B
Input
A272-282 Rev. 4 02/2020
Output
Output
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