Chiller tripped

[m sleem]

There is a project is served by multiple chillers, one of the chillers had many trips inside the built in control panel while no trips at the main disconnect, the chiller's supplier came and justified these trips due to the under voltage levels and he collected the voltage readings second by second for two hrs for load and no load statuses across the supply of the main disconnect, i put together the max & min readings for 2 hrs as follows:

for no load:

Comments	L1min (V)	L1avg (V)	L1max (V)	L2min (V)	L2avg (V)	L2max (V)	L3min (V)	L3avg (V)	L3max (V)
MAX	218.2	222.5	258.8	216.5	221.1	254.8	217.9	222.5	255.2
MIN	170	214.9	231.4	164.8	213	230.9	169.3	214.1	231.8

for load:

Comments	L1min (V)	L1avg (V)	L1max (V)	L2min (V)	L2avg (V)	L2max (V)	L3min (V)	L3avg (V)	L3max (V)
MAX	222.4	228.6	260.9	221.4	227.6	256.9	222.6	229	253.6
MIN	181.9	220.6	236.2	174.9	219.4	234.7	183.9	220.4	235.7

The input voltage for the control panel is 1 phase 220v typically the phase voltage at the main disconnect.

As you can see all average readings within range min 213v, aside from the voltage level what would be reasons???

I can upload the full readings if required.

 

[StarCat]

Comments

Comments

Sleem, I am a chiller Tech by trade. Without knowing more specifics about your equipment what I will tell you is that on 208-230v gear I don't like to see anything under 200V for real world supply voltage on this kind of machine. That number is based on experience and getting down lower invites problems.
If some of those low figures recorded are there for sustained duration there very well may be trips of on board protection.
No refrigeration machine will fare well on undervoltage. Some are more tolerant than others but it depends on many factors.