TimeTemperatureSetpoint Guided channel10 °CSetpoint Reference channelTimeTemperatureSetpoint Reference channel2 °CSetpoint Guided channelOperation 4-21P/N 7105144G 2008 Nordson Corporation VersaBlue_NWHeatup Guided by Reference ChannelNOTE: All activated channels in control mode are included in the heatupguided by reference channel, including those assigned to an activatedapplication group.After every switchon and after standby is exited, the melter returns toHeatup phase (status display).Heatup guided by reference channel prevents individual temperaturechannels from reaching their setpoint temperature long before the slowesttemperature channel (reservoir/high melt = reference channel). It preventshot melt material from charring in hoses / guns and the build-up of materialexpansion pressure during heatup. It also helps to save energy.The actual reservoir temperature serves as the current temperature setpointfor the guided channels until the reservoir has reached a temperature of10 °C (18 °F) below its setpoint temperature. Then heatup guided byreference channel ends automatically. This way all channels reach theirsetpoint temperatures more or less at the same time.Fig. 4-12When the current temperature setpoint of a guided channel (= current valueof reservoir/high melt) reaches the guided channel’s own setpoint minus2 °C (3.6 °F), it is excluded from heatup guided by reference channel andthen heats to its own setpoint independently (Refer to Fig. 4-13).Fig. 4-13
